v0.20.0

Changes:
- Added `x/metrics` package
- Added `tools/metrics_exporter` binary

.gitignore

@@ -14,12 +14,13 @@
 # Ignore examples for now
 /examples
 
-# Ignore command binary
+# Ignore tool binaries
 /tools/asynq/asynq
+/tools/metrics_exporter/metrics_exporter
 
 # Ignore asynq config file
 .asynq.*
 
 # Ignore editor config files
 .vscode
-.idea
+.idea

CHANGELOG.md

@@ -7,6 +7,25 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.20.0] - 2021-12-19
+
+### Added
+
+- Package `x/metrics` is added.
+- Tool `tools/metrics_exporter` binary is added.
+- `ProcessedTotal` and `FailedTotal` fields were added to `QueueInfo` struct.
+
+## [0.19.1] - 2021-12-12
+
+### Added
+
+- `Latency` field is added to `QueueInfo`.
+- `EnqueueContext` method is added to `Client`.
+
+### Fixed
+
+- Fixed an error when user pass a duration less than 1s to `Unique` option
+
 ## [0.19.0] - 2021-11-06
 
 ### Changed

client.go

@@ -5,6 +5,7 @@
 package asynq
 
 import (
+	"context"
 	"fmt"
 	"strings"
 	"time"
@@ -143,6 +144,7 @@ func (t deadlineOption) Value() interface{} { return time.Time(t) }
 // Task enqueued with this option is guaranteed to be unique within the given ttl.
 // Once the task gets processed successfully or once the TTL has expired, another task with the same uniqueness may be enqueued.
 // ErrDuplicateTask error is returned when enqueueing a duplicate task.
+// TTL duration must be greater than or equal to 1 second.
 //
 // Uniqueness of a task is based on the following properties:
 //     - Task Type
@@ -246,7 +248,11 @@ func composeOptions(opts ...Option) (option, error) {
 		case deadlineOption:
 			res.deadline = time.Time(opt)
 		case uniqueOption:
-			res.uniqueTTL = time.Duration(opt)
+			ttl := time.Duration(opt)
+			if ttl < 1*time.Second {
+				return option{}, errors.New("Unique TTL cannot be less than 1s")
+			}
+			res.uniqueTTL = ttl
 		case processAtOption:
 			res.processAt = time.Time(opt)
 		case processInOption:
@@ -287,7 +293,7 @@ func (c *Client) Close() error {
 	return c.rdb.Close()
 }
 
-// Enqueue enqueues the given task to be processed asynchronously.
+// Enqueue enqueues the given task to a queue.
 //
 // Enqueue returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
 //
@@ -297,7 +303,25 @@ func (c *Client) Close() error {
 // By deafult, max retry is set to 25 and timeout is set to 30 minutes.
 //
 // If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// Enqueue uses context.Background internally; to specify the context, use EnqueueContext.
 func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
+	return c.EnqueueContext(context.Background(), task, opts...)
+}
+
+// EnqueueContext enqueues the given task to a queue.
+//
+// EnqueueContext returns TaskInfo and nil error if the task is enqueued successfully, otherwise returns a non-nil error.
+//
+// The argument opts specifies the behavior of task processing.
+// If there are conflicting Option values the last one overrides others.
+// Any options provided to NewTask can be overridden by options passed to Enqueue.
+// By deafult, max retry is set to 25 and timeout is set to 30 minutes.
+//
+// If no ProcessAt or ProcessIn options are provided, the task will be pending immediately.
+//
+// The first argument context applies to the enqueue operation. To specify task timeout and deadline, use Timeout and Deadline option instead.
+func (c *Client) EnqueueContext(ctx context.Context, task *Task, opts ...Option) (*TaskInfo, error) {
 	if strings.TrimSpace(task.Type()) == "" {
 		return nil, fmt.Errorf("task typename cannot be empty")
 	}
@@ -338,10 +362,10 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 	var state base.TaskState
 	if opt.processAt.Before(now) || opt.processAt.Equal(now) {
 		opt.processAt = now
-		err = c.enqueue(msg, opt.uniqueTTL)
+		err = c.enqueue(ctx, msg, opt.uniqueTTL)
 		state = base.TaskStatePending
 	} else {
-		err = c.schedule(msg, opt.processAt, opt.uniqueTTL)
+		err = c.schedule(ctx, msg, opt.processAt, opt.uniqueTTL)
 		state = base.TaskStateScheduled
 	}
 	switch {
@@ -355,17 +379,17 @@ func (c *Client) Enqueue(task *Task, opts ...Option) (*TaskInfo, error) {
 	return newTaskInfo(msg, state, opt.processAt, nil), nil
 }
 
-func (c *Client) enqueue(msg *base.TaskMessage, uniqueTTL time.Duration) error {
+func (c *Client) enqueue(ctx context.Context, msg *base.TaskMessage, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
-		return c.rdb.EnqueueUnique(msg, uniqueTTL)
+		return c.rdb.EnqueueUnique(ctx, msg, uniqueTTL)
 	}
-	return c.rdb.Enqueue(msg)
+	return c.rdb.Enqueue(ctx, msg)
 }
 
-func (c *Client) schedule(msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
+func (c *Client) schedule(ctx context.Context, msg *base.TaskMessage, t time.Time, uniqueTTL time.Duration) error {
 	if uniqueTTL > 0 {
 		ttl := t.Add(uniqueTTL).Sub(time.Now())
-		return c.rdb.ScheduleUnique(msg, t, ttl)
+		return c.rdb.ScheduleUnique(ctx, msg, t, ttl)
 	}
-	return c.rdb.Schedule(msg, t)
+	return c.rdb.Schedule(ctx, msg, t)
 }

client_test.go

@@ -734,6 +734,11 @@ func TestClientEnqueueError(t *testing.T) {
 			task: NewTask("foo", nil),
 			opts: []Option{TaskID("  ")},
 		},
+		{
+			desc: "With unique option less than 1s",
+			task: NewTask("foo", nil),
+			opts: []Option{Unique(300 * time.Millisecond)},
+		},
 	}
 
 	for _, tc := range tests {

inspector.go

@@ -52,6 +52,9 @@ type QueueInfo struct {
 	// It is an approximate memory usage value in bytes since the value is computed by sampling.
 	MemoryUsage int64
 
+	// Latency of the queue, measured by the oldest pending task in the queue.
+	Latency time.Duration
+
 	// Size is the total number of tasks in the queue.
 	// The value is the sum of Pending, Active, Scheduled, Retry, and Archived.
 	Size int
@@ -69,12 +72,17 @@ type QueueInfo struct {
 	// Number of stored completed tasks.
 	Completed int
 
-	// Total number of tasks being processed during the given date.
+	// Total number of tasks being processed within the given date (counter resets daily).
 	// The number includes both succeeded and failed tasks.
 	Processed int
-	// Total number of tasks failed to be processed during the given date.
+	// Total number of tasks failed to be processed within the given date (counter resets daily).
 	Failed int
 
+	// Total number of tasks processed (cumulative).
+	ProcessedTotal int
+	// Total number of tasks failed (cumulative).
+	FailedTotal int
+
 	// Paused indicates whether the queue is paused.
 	// If true, tasks in the queue will not be processed.
 	Paused bool
@@ -93,19 +101,22 @@ func (i *Inspector) GetQueueInfo(qname string) (*QueueInfo, error) {
 		return nil, err
 	}
 	return &QueueInfo{
-		Queue:       stats.Queue,
-		MemoryUsage: stats.MemoryUsage,
-		Size:        stats.Size,
-		Pending:     stats.Pending,
-		Active:      stats.Active,
-		Scheduled:   stats.Scheduled,
-		Retry:       stats.Retry,
-		Archived:    stats.Archived,
-		Completed:   stats.Completed,
-		Processed:   stats.Processed,
-		Failed:      stats.Failed,
-		Paused:      stats.Paused,
-		Timestamp:   stats.Timestamp,
+		Queue:          stats.Queue,
+		MemoryUsage:    stats.MemoryUsage,
+		Latency:        stats.Latency,
+		Size:           stats.Size,
+		Pending:        stats.Pending,
+		Active:         stats.Active,
+		Scheduled:      stats.Scheduled,
+		Retry:          stats.Retry,
+		Archived:       stats.Archived,
+		Completed:      stats.Completed,
+		Processed:      stats.Processed,
+		Failed:         stats.Failed,
+		ProcessedTotal: stats.ProcessedTotal,
+		FailedTotal:    stats.FailedTotal,
+		Paused:         stats.Paused,
+		Timestamp:      stats.Timestamp,
 	}, nil
 }
 
@@ -177,8 +188,8 @@ func (i *Inspector) DeleteQueue(qname string, force bool) error {
 
 // GetTaskInfo retrieves task information given a task id and queue name.
 //
-// Returns ErrQueueNotFound if a queue with the given name doesn't exist.
-// Returns ErrTaskNotFound if a task with the given id doesn't exist in the queue.
+// Returns an error wrapping ErrQueueNotFound if a queue with the given name doesn't exist.
+// Returns an error wrapping ErrTaskNotFound if a task with the given id doesn't exist in the queue.
 func (i *Inspector) GetTaskInfo(qname, id string) (*TaskInfo, error) {
 	info, err := i.rdb.GetTaskInfo(qname, id)
 	switch {
@@ -479,8 +490,8 @@ func (i *Inspector) DeleteAllCompletedTasks(qname string) (int, error) {
 // The task needs to be in pending, scheduled, retry, or archived state,
 // otherwise DeleteTask will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in active state, it returns a non-nil error.
 func (i *Inspector) DeleteTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {
@@ -533,8 +544,8 @@ func (i *Inspector) RunAllArchivedTasks(qname string) (int, error) {
 // The task needs to be in scheduled, retry, or archived state, otherwise RunTask
 // will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in pending or active state, it returns a non-nil error.
 func (i *Inspector) RunTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {
@@ -586,8 +597,8 @@ func (i *Inspector) ArchiveAllRetryTasks(qname string) (int, error) {
 // The task needs to be in pending, scheduled, or retry state, otherwise ArchiveTask
 // will return an error.
 //
-// If a queue with the given name doesn't exist, it returns ErrQueueNotFound.
-// If a task with the given id doesn't exist in the queue, it returns ErrTaskNotFound.
+// If a queue with the given name doesn't exist, it returns an error wrapping ErrQueueNotFound.
+// If a task with the given id doesn't exist in the queue, it returns an error wrapping ErrTaskNotFound.
 // If the task is in already archived, it returns a non-nil error.
 func (i *Inspector) ArchiveTask(qname, id string) error {
 	if err := base.ValidateQueueName(qname); err != nil {

inspector_test.go

@@ -19,6 +19,7 @@ import (
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/rdb"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 func TestInspectorQueues(t *testing.T) {
@@ -269,18 +270,22 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 	ignoreMemUsg := cmpopts.IgnoreFields(QueueInfo{}, "MemoryUsage")
 
 	inspector := NewInspector(getRedisConnOpt(t))
+	inspector.rdb.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
-		pending   map[string][]*base.TaskMessage
-		active    map[string][]*base.TaskMessage
-		scheduled map[string][]base.Z
-		retry     map[string][]base.Z
-		archived  map[string][]base.Z
-		completed map[string][]base.Z
-		processed map[string]int
-		failed    map[string]int
-		qname     string
-		want      *QueueInfo
+		pending                         map[string][]*base.TaskMessage
+		active                          map[string][]*base.TaskMessage
+		scheduled                       map[string][]base.Z
+		retry                           map[string][]base.Z
+		archived                        map[string][]base.Z
+		completed                       map[string][]base.Z
+		processed                       map[string]int
+		failed                          map[string]int
+		processedTotal                  map[string]int
+		failedTotal                     map[string]int
+		oldestPendingMessageEnqueueTime map[string]time.Time
+		qname                           string
+		want                            *QueueInfo
 	}{
 		{
 			pending: map[string][]*base.TaskMessage{
@@ -326,20 +331,38 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 				"critical": 0,
 				"low":      5,
 			},
+			processedTotal: map[string]int{
+				"default":  11111,
+				"critical": 22222,
+				"low":      33333,
+			},
+			failedTotal: map[string]int{
+				"default":  111,
+				"critical": 222,
+				"low":      333,
+			},
+			oldestPendingMessageEnqueueTime: map[string]time.Time{
+				"default":  now.Add(-15 * time.Second),
+				"critical": now.Add(-200 * time.Millisecond),
+				"low":      now.Add(-30 * time.Second),
+			},
 			qname: "default",
 			want: &QueueInfo{
-				Queue:     "default",
-				Size:      4,
-				Pending:   1,
-				Active:    1,
-				Scheduled: 2,
-				Retry:     0,
-				Archived:  0,
-				Completed: 0,
-				Processed: 120,
-				Failed:    2,
-				Paused:    false,
-				Timestamp: now,
+				Queue:          "default",
+				Latency:        15 * time.Second,
+				Size:           4,
+				Pending:        1,
+				Active:         1,
+				Scheduled:      2,
+				Retry:          0,
+				Archived:       0,
+				Completed:      0,
+				Processed:      120,
+				Failed:         2,
+				ProcessedTotal: 11111,
+				FailedTotal:    111,
+				Paused:         false,
+				Timestamp:      now,
 			},
 		},
 	}
@@ -352,13 +375,25 @@ func TestInspectorGetQueueInfo(t *testing.T) {
 		h.SeedAllRetryQueues(t, r, tc.retry)
 		h.SeedAllArchivedQueues(t, r, tc.archived)
 		h.SeedAllCompletedQueues(t, r, tc.completed)
+		ctx := context.Background()
 		for qname, n := range tc.processed {
-			processedKey := base.ProcessedKey(qname, now)
-			r.Set(context.Background(), processedKey, n, 0)
+			r.Set(ctx, base.ProcessedKey(qname, now), n, 0)
 		}
 		for qname, n := range tc.failed {
-			failedKey := base.FailedKey(qname, now)
-			r.Set(context.Background(), failedKey, n, 0)
+			r.Set(ctx, base.FailedKey(qname, now), n, 0)
+		}
+		for qname, n := range tc.processedTotal {
+			r.Set(ctx, base.ProcessedTotalKey(qname), n, 0)
+		}
+		for qname, n := range tc.failedTotal {
+			r.Set(ctx, base.FailedTotalKey(qname), n, 0)
+		}
+		for qname, enqueueTime := range tc.oldestPendingMessageEnqueueTime {
+			if enqueueTime.IsZero() {
+				continue
+			}
+			oldestPendingMessageID := r.LRange(ctx, base.PendingKey(qname), -1, -1).Val()[0] // get the right most msg in the list
+			r.HSet(ctx, base.TaskKey(qname, oldestPendingMessageID), "pending_since", enqueueTime.UnixNano())
 		}
 
 		got, err := inspector.GetQueueInfo(tc.qname)

internal/base/base.go

@@ -22,7 +22,7 @@ import (
 )
 
 // Version of asynq library and CLI.
-const Version = "0.19.0"
+const Version = "0.20.0"
 
 // DefaultQueueName is the queue name used if none are specified by user.
 const DefaultQueueName = "default"
@@ -150,6 +150,16 @@ func PausedKey(qname string) string {
 	return fmt.Sprintf("%spaused", QueueKeyPrefix(qname))
 }
 
+// ProcessedTotalKey returns a redis key for total processed count for the given queue.
+func ProcessedTotalKey(qname string) string {
+	return fmt.Sprintf("%sprocessed", QueueKeyPrefix(qname))
+}
+
+// FailedTotalKey returns a redis key for total failure count for the given queue.
+func FailedTotalKey(qname string) string {
+	return fmt.Sprintf("%sfailed", QueueKeyPrefix(qname))
+}
+
 // ProcessedKey returns a redis key for processed count for the given day for the queue.
 func ProcessedKey(qname string, t time.Time) string {
 	return fmt.Sprintf("%sprocessed:%s", QueueKeyPrefix(qname), t.UTC().Format("2006-01-02"))
@@ -660,14 +670,14 @@ func (c *Cancelations) Get(id string) (fn context.CancelFunc, ok bool) {
 // See rdb.RDB as a reference implementation.
 type Broker interface {
 	Ping() error
-	Enqueue(msg *TaskMessage) error
-	EnqueueUnique(msg *TaskMessage, ttl time.Duration) error
+	Enqueue(ctx context.Context, msg *TaskMessage) error
+	EnqueueUnique(ctx context.Context, msg *TaskMessage, ttl time.Duration) error
 	Dequeue(qnames ...string) (*TaskMessage, time.Time, error)
 	Done(msg *TaskMessage) error
 	MarkAsComplete(msg *TaskMessage) error
 	Requeue(msg *TaskMessage) error
-	Schedule(msg *TaskMessage, processAt time.Time) error
-	ScheduleUnique(msg *TaskMessage, processAt time.Time, ttl time.Duration) error
+	Schedule(ctx context.Context, msg *TaskMessage, processAt time.Time) error
+	ScheduleUnique(ctx context.Context, msg *TaskMessage, processAt time.Time, ttl time.Duration) error
 	Retry(msg *TaskMessage, processAt time.Time, errMsg string, isFailure bool) error
 	Archive(msg *TaskMessage, errMsg string) error
 	ForwardIfReady(qnames ...string) error

internal/base/base_test.go

@@ -173,6 +173,40 @@ func TestPausedKey(t *testing.T) {
 	}
 }
 
+func TestProcessedTotalKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"default", "asynq:{default}:processed"},
+		{"custom", "asynq:{custom}:processed"},
+	}
+
+	for _, tc := range tests {
+		got := ProcessedTotalKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("ProcessedTotalKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
+func TestFailedTotalKey(t *testing.T) {
+	tests := []struct {
+		qname string
+		want  string
+	}{
+		{"default", "asynq:{default}:failed"},
+		{"custom", "asynq:{custom}:failed"},
+	}
+
+	for _, tc := range tests {
+		got := FailedTotalKey(tc.qname)
+		if got != tc.want {
+			t.Errorf("FailedTotalKey(%q) = %q, want %q", tc.qname, got, tc.want)
+		}
+	}
+}
+
 func TestProcessedKey(t *testing.T) {
 	tests := []struct {
 		qname string

internal/rdb/benchmark_test.go

@@ -5,6 +5,7 @@
 package rdb
 
 import (
+	"context"
 	"fmt"
 	"testing"
 	"time"
@@ -15,6 +16,7 @@ import (
 
 func BenchmarkEnqueue(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := asynqtest.NewTaskMessage("task1", nil)
 	b.ResetTimer()
 
@@ -23,7 +25,7 @@ func BenchmarkEnqueue(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Enqueue(msg); err != nil {
+		if err := r.Enqueue(ctx, msg); err != nil {
 			b.Fatalf("Enqueue failed: %v", err)
 		}
 	}
@@ -31,6 +33,7 @@ func BenchmarkEnqueue(b *testing.B) {
 
 func BenchmarkEnqueueUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -45,7 +48,7 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.EnqueueUnique(msg, uniqueTTL); err != nil {
+		if err := r.EnqueueUnique(ctx, msg, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -53,6 +56,7 @@ func BenchmarkEnqueueUnique(b *testing.B) {
 
 func BenchmarkSchedule(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := asynqtest.NewTaskMessage("task1", nil)
 	processAt := time.Now().Add(3 * time.Minute)
 	b.ResetTimer()
@@ -62,7 +66,7 @@ func BenchmarkSchedule(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.Schedule(msg, processAt); err != nil {
+		if err := r.Schedule(ctx, msg, processAt); err != nil {
 			b.Fatalf("Schedule failed: %v", err)
 		}
 	}
@@ -70,6 +74,7 @@ func BenchmarkSchedule(b *testing.B) {
 
 func BenchmarkScheduleUnique(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	msg := &base.TaskMessage{
 		Type:      "task1",
 		Payload:   nil,
@@ -85,7 +90,7 @@ func BenchmarkScheduleUnique(b *testing.B) {
 		asynqtest.FlushDB(b, r.client)
 		b.StartTimer()
 
-		if err := r.ScheduleUnique(msg, processAt, uniqueTTL); err != nil {
+		if err := r.ScheduleUnique(ctx, msg, processAt, uniqueTTL); err != nil {
 			b.Fatalf("EnqueueUnique failed: %v", err)
 		}
 	}
@@ -93,6 +98,7 @@ func BenchmarkScheduleUnique(b *testing.B) {
 
 func BenchmarkDequeueSingleQueue(b *testing.B) {
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -101,7 +107,7 @@ func BenchmarkDequeueSingleQueue(b *testing.B) {
 		for i := 0; i < 10; i++ {
 			m := asynqtest.NewTaskMessageWithQueue(
 				fmt.Sprintf("task%d", i), nil, base.DefaultQueueName)
-			if err := r.Enqueue(m); err != nil {
+			if err := r.Enqueue(ctx, m); err != nil {
 				b.Fatalf("Enqueue failed: %v", err)
 			}
 		}
@@ -116,6 +122,7 @@ func BenchmarkDequeueSingleQueue(b *testing.B) {
 func BenchmarkDequeueMultipleQueues(b *testing.B) {
 	qnames := []string{"critical", "default", "low"}
 	r := setup(b)
+	ctx := context.Background()
 	b.ResetTimer()
 
 	for i := 0; i < b.N; i++ {
@@ -125,7 +132,7 @@ func BenchmarkDequeueMultipleQueues(b *testing.B) {
 			for _, qname := range qnames {
 				m := asynqtest.NewTaskMessageWithQueue(
 					fmt.Sprintf("%s_task%d", qname, i), nil, qname)
-				if err := r.Enqueue(m); err != nil {
+				if err := r.Enqueue(ctx, m); err != nil {
 					b.Fatalf("Enqueue failed: %v", err)
 				}
 			}

internal/rdb/inspect.go

@@ -41,11 +41,20 @@ type Stats struct {
 	Retry     int
 	Archived  int
 	Completed int
-	// Total number of tasks processed during the current date.
+
+	// Number of tasks processed within the current date.
 	// The number includes both succeeded and failed tasks.
 	Processed int
-	// Total number of tasks failed during the current date.
+	// Number of tasks failed within the current date.
 	Failed int
+
+	// Total number of tasks processed (both succeeded and failed) from this queue.
+	ProcessedTotal int
+	// Total number of tasks failed.
+	FailedTotal int
+
+	// Latency of the queue, measured by the oldest pending task in the queue.
+	Latency time.Duration
 	// Time this stats was taken.
 	Timestamp time.Time
 }
@@ -63,19 +72,24 @@ type DailyStats struct {
 	Time time.Time
 }
 
-// KEYS[1] -> asynq:<qname>
-// KEYS[2] -> asynq:<qname>:active
-// KEYS[3] -> asynq:<qname>:scheduled
-// KEYS[4] -> asynq:<qname>:retry
-// KEYS[5] -> asynq:<qname>:archived
-// KEYS[6] -> asynq:<qname>:completed
-// KEYS[7] -> asynq:<qname>:processed:<yyyy-mm-dd>
-// KEYS[8] -> asynq:<qname>:failed:<yyyy-mm-dd>
-// KEYS[9] -> asynq:<qname>:paused
+// KEYS[1] ->  asynq:<qname>:pending
+// KEYS[2] ->  asynq:<qname>:active
+// KEYS[3] ->  asynq:<qname>:scheduled
+// KEYS[4] ->  asynq:<qname>:retry
+// KEYS[5] ->  asynq:<qname>:archived
+// KEYS[6] ->  asynq:<qname>:completed
+// KEYS[7] ->  asynq:<qname>:processed:<yyyy-mm-dd>
+// KEYS[8] ->  asynq:<qname>:failed:<yyyy-mm-dd>
+// KEYS[9] ->  asynq:<qname>:processed
+// KEYS[10] -> asynq:<qname>:failed
+// KEYS[11] -> asynq:<qname>:paused
+//
+// ARGV[1] -> task key prefix
 var currentStatsCmd = redis.NewScript(`
 local res = {}
+local pendingTaskCount = redis.call("LLEN", KEYS[1])
 table.insert(res, KEYS[1])
-table.insert(res, redis.call("LLEN", KEYS[1]))
+table.insert(res, pendingTaskCount)
 table.insert(res, KEYS[2])
 table.insert(res, redis.call("LLEN", KEYS[2]))
 table.insert(res, KEYS[3])
@@ -86,22 +100,24 @@ table.insert(res, KEYS[5])
 table.insert(res, redis.call("ZCARD", KEYS[5]))
 table.insert(res, KEYS[6])
 table.insert(res, redis.call("ZCARD", KEYS[6]))
-local pcount = 0
-local p = redis.call("GET", KEYS[7])
-if p then
-	pcount = tonumber(p) 
+for i=7,10 do
+    local count = 0
+	local n = redis.call("GET", KEYS[i])	
+	if n then
+	    count = tonumber(n)
+	end
+	table.insert(res, KEYS[i])
+	table.insert(res, count)
 end
-table.insert(res, KEYS[7])
-table.insert(res, pcount)
-local fcount = 0
-local f = redis.call("GET", KEYS[8])
-if f then
-	fcount = tonumber(f)
+table.insert(res, KEYS[11])
+table.insert(res, redis.call("EXISTS", KEYS[11]))
+table.insert(res, "oldest_pending_since")
+if pendingTaskCount > 0 then
+	local id = redis.call("LRANGE", KEYS[1], -1, -1)[1]
+	table.insert(res, redis.call("HGET", ARGV[1] .. id, "pending_since"))
+else
+	table.insert(res, 0)
 end
-table.insert(res, KEYS[8])
-table.insert(res, fcount)
-table.insert(res, KEYS[9])
-table.insert(res, redis.call("EXISTS", KEYS[9]))
 return res`)
 
 // CurrentStats returns a current state of the queues.
@@ -124,8 +140,10 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 		base.CompletedKey(qname),
 		base.ProcessedKey(qname, now),
 		base.FailedKey(qname, now),
+		base.ProcessedTotalKey(qname),
+		base.FailedTotalKey(qname),
 		base.PausedKey(qname),
-	}).Result()
+	}, base.TaskKeyPrefix(qname)).Result()
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, err)
 	}
@@ -164,12 +182,22 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 			stats.Processed = val
 		case base.FailedKey(qname, now):
 			stats.Failed = val
+		case base.ProcessedTotalKey(qname):
+			stats.ProcessedTotal = val
+		case base.FailedTotalKey(qname):
+			stats.FailedTotal = val
 		case base.PausedKey(qname):
 			if val == 0 {
 				stats.Paused = false
 			} else {
 				stats.Paused = true
 			}
+		case "oldest_pending_since":
+			if val == 0 {
+				stats.Latency = 0
+			} else {
+				stats.Latency = r.clock.Now().Sub(time.Unix(0, int64(val)))
+			}
 		}
 	}
 	stats.Size = size

internal/rdb/inspect_test.go

@@ -17,6 +17,7 @@ import (
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 func TestAllQueues(t *testing.T) {
@@ -60,19 +61,23 @@ func TestCurrentStats(t *testing.T) {
 	m5 := h.NewTaskMessageWithQueue("important_notification", nil, "critical")
 	m6 := h.NewTaskMessageWithQueue("minor_notification", nil, "low")
 	now := time.Now()
+	r.SetClock(timeutil.NewSimulatedClock(now))
 
 	tests := []struct {
-		pending    map[string][]*base.TaskMessage
-		inProgress map[string][]*base.TaskMessage
-		scheduled  map[string][]base.Z
-		retry      map[string][]base.Z
-		archived   map[string][]base.Z
-		completed  map[string][]base.Z
-		processed  map[string]int
-		failed     map[string]int
-		paused     []string
-		qname      string
-		want       *Stats
+		pending                         map[string][]*base.TaskMessage
+		active                          map[string][]*base.TaskMessage
+		scheduled                       map[string][]base.Z
+		retry                           map[string][]base.Z
+		archived                        map[string][]base.Z
+		completed                       map[string][]base.Z
+		processed                       map[string]int
+		failed                          map[string]int
+		processedTotal                  map[string]int
+		failedTotal                     map[string]int
+		paused                          []string
+		oldestPendingMessageEnqueueTime map[string]time.Time
+		qname                           string
+		want                            *Stats
 	}{
 		{
 			pending: map[string][]*base.TaskMessage{
@@ -80,7 +85,7 @@ func TestCurrentStats(t *testing.T) {
 				"critical": {m5},
 				"low":      {m6},
 			},
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {m2},
 				"critical": {},
 				"low":      {},
@@ -118,30 +123,48 @@ func TestCurrentStats(t *testing.T) {
 				"critical": 0,
 				"low":      1,
 			},
+			processedTotal: map[string]int{
+				"default":  11111,
+				"critical": 22222,
+				"low":      33333,
+			},
+			failedTotal: map[string]int{
+				"default":  111,
+				"critical": 222,
+				"low":      333,
+			},
+			oldestPendingMessageEnqueueTime: map[string]time.Time{
+				"default":  now.Add(-15 * time.Second),
+				"critical": now.Add(-200 * time.Millisecond),
+				"low":      now.Add(-30 * time.Second),
+			},
 			paused: []string{},
 			qname:  "default",
 			want: &Stats{
-				Queue:     "default",
-				Paused:    false,
-				Size:      4,
-				Pending:   1,
-				Active:    1,
-				Scheduled: 2,
-				Retry:     0,
-				Archived:  0,
-				Completed: 0,
-				Processed: 120,
-				Failed:    2,
-				Timestamp: now,
+				Queue:          "default",
+				Paused:         false,
+				Size:           4,
+				Pending:        1,
+				Active:         1,
+				Scheduled:      2,
+				Retry:          0,
+				Archived:       0,
+				Completed:      0,
+				Processed:      120,
+				Failed:         2,
+				ProcessedTotal: 11111,
+				FailedTotal:    111,
+				Latency:        15 * time.Second,
+				Timestamp:      now,
 			},
 		},
 		{
 			pending: map[string][]*base.TaskMessage{
 				"default":  {m1},
-				"critical": {m5},
+				"critical": {},
 				"low":      {m6},
 			},
-			inProgress: map[string][]*base.TaskMessage{
+			active: map[string][]*base.TaskMessage{
 				"default":  {m2},
 				"critical": {},
 				"low":      {},
@@ -179,21 +202,39 @@ func TestCurrentStats(t *testing.T) {
 				"critical": 0,
 				"low":      1,
 			},
+			processedTotal: map[string]int{
+				"default":  11111,
+				"critical": 22222,
+				"low":      33333,
+			},
+			failedTotal: map[string]int{
+				"default":  111,
+				"critical": 222,
+				"low":      333,
+			},
+			oldestPendingMessageEnqueueTime: map[string]time.Time{
+				"default":  now.Add(-15 * time.Second),
+				"critical": time.Time{}, // zero value since there's no pending task in this queue
+				"low":      now.Add(-30 * time.Second),
+			},
 			paused: []string{"critical", "low"},
 			qname:  "critical",
 			want: &Stats{
-				Queue:     "critical",
-				Paused:    true,
-				Size:      1,
-				Pending:   1,
-				Active:    0,
-				Scheduled: 0,
-				Retry:     0,
-				Archived:  0,
-				Completed: 0,
-				Processed: 100,
-				Failed:    0,
-				Timestamp: now,
+				Queue:          "critical",
+				Paused:         true,
+				Size:           0,
+				Pending:        0,
+				Active:         0,
+				Scheduled:      0,
+				Retry:          0,
+				Archived:       0,
+				Completed:      0,
+				Processed:      100,
+				Failed:         0,
+				ProcessedTotal: 22222,
+				FailedTotal:    222,
+				Latency:        0,
+				Timestamp:      now,
 			},
 		},
 	}
@@ -206,18 +247,30 @@ func TestCurrentStats(t *testing.T) {
 			}
 		}
 		h.SeedAllPendingQueues(t, r.client, tc.pending)
-		h.SeedAllActiveQueues(t, r.client, tc.inProgress)
+		h.SeedAllActiveQueues(t, r.client, tc.active)
 		h.SeedAllScheduledQueues(t, r.client, tc.scheduled)
 		h.SeedAllRetryQueues(t, r.client, tc.retry)
 		h.SeedAllArchivedQueues(t, r.client, tc.archived)
 		h.SeedAllCompletedQueues(t, r.client, tc.completed)
+		ctx := context.Background()
 		for qname, n := range tc.processed {
-			processedKey := base.ProcessedKey(qname, now)
-			r.client.Set(context.Background(), processedKey, n, 0)
+			r.client.Set(ctx, base.ProcessedKey(qname, now), n, 0)
 		}
 		for qname, n := range tc.failed {
-			failedKey := base.FailedKey(qname, now)
-			r.client.Set(context.Background(), failedKey, n, 0)
+			r.client.Set(ctx, base.FailedKey(qname, now), n, 0)
+		}
+		for qname, n := range tc.processedTotal {
+			r.client.Set(ctx, base.ProcessedTotalKey(qname), n, 0)
+		}
+		for qname, n := range tc.failedTotal {
+			r.client.Set(ctx, base.FailedTotalKey(qname), n, 0)
+		}
+		for qname, enqueueTime := range tc.oldestPendingMessageEnqueueTime {
+			if enqueueTime.IsZero() {
+				continue
+			}
+			oldestPendingMessageID := r.client.LRange(ctx, base.PendingKey(qname), -1, -1).Val()[0] // get the right most msg in the list
+			r.client.HSet(ctx, base.TaskKey(qname, oldestPendingMessageID), "pending_since", enqueueTime.UnixNano())
 		}
 
 		got, err := r.CurrentStats(tc.qname)
@@ -879,7 +932,7 @@ func TestListScheduledPagination(t *testing.T) {
 	// create 100 tasks with an increasing number of wait time.
 	for i := 0; i < 100; i++ {
 		msg := h.NewTaskMessage(fmt.Sprintf("task %d", i), nil)
-		if err := r.Schedule(msg, time.Now().Add(time.Duration(i)*time.Second)); err != nil {
+		if err := r.Schedule(context.Background(), msg, time.Now().Add(time.Duration(i)*time.Second)); err != nil {
 			t.Fatal(err)
 		}
 	}

internal/rdb/rdb.go

@@ -8,11 +8,13 @@ package rdb
 import (
 	"context"
 	"fmt"
+	"math"
 	"time"
 
 	"github.com/go-redis/redis/v8"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
+	"github.com/hibiken/asynq/internal/timeutil"
 	"github.com/spf13/cast"
 )
 
@@ -21,11 +23,15 @@ const statsTTL = 90 * 24 * time.Hour // 90 days
 // RDB is a client interface to query and mutate task queues.
 type RDB struct {
 	client redis.UniversalClient
+	clock  timeutil.Clock
 }
 
 // NewRDB returns a new instance of RDB.
 func NewRDB(client redis.UniversalClient) *RDB {
-	return &RDB{client}
+	return &RDB{
+		client: client,
+		clock:  timeutil.NewRealClock(),
+	}
 }
 
 // Close closes the connection with redis server.
@@ -38,21 +44,28 @@ func (r *RDB) Client() redis.UniversalClient {
 	return r.client
 }
 
+// SetClock sets the clock used by RDB to the given clock.
+//
+// Use this function to set the clock to SimulatedClock in tests.
+func (r *RDB) SetClock(c timeutil.Clock) {
+	r.clock = c
+}
+
 // Ping checks the connection with redis server.
 func (r *RDB) Ping() error {
 	return r.client.Ping(context.Background()).Err()
 }
 
-func (r *RDB) runScript(op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
-	if err := script.Run(context.Background(), r.client, keys, args...).Err(); err != nil {
+func (r *RDB) runScript(ctx context.Context, op errors.Op, script *redis.Script, keys []string, args ...interface{}) error {
+	if err := script.Run(ctx, r.client, keys, args...).Err(); err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
 	return nil
 }
 
 // Runs the given script with keys and args and retuns the script's return value as int64.
-func (r *RDB) runScriptWithErrorCode(op errors.Op, script *redis.Script, keys []string, args ...interface{}) (int64, error) {
-	res, err := script.Run(context.Background(), r.client, keys, args...).Result()
+func (r *RDB) runScriptWithErrorCode(ctx context.Context, op errors.Op, script *redis.Script, keys []string, args ...interface{}) (int64, error) {
+	res, err := script.Run(ctx, r.client, keys, args...).Result()
 	if err != nil {
 		return 0, errors.E(op, errors.Unknown, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -73,6 +86,7 @@ func (r *RDB) runScriptWithErrorCode(op errors.Op, script *redis.Script, keys []
 // ARGV[2] -> task ID
 // ARGV[3] -> task timeout in seconds (0 if not timeout)
 // ARGV[4] -> task deadline in unix time (0 if no deadline)
+// ARGV[5] -> current unix time in nsec
 //
 // Output:
 // Returns 1 if successfully enqueued
@@ -85,19 +99,20 @@ redis.call("HSET", KEYS[1],
            "msg", ARGV[1],
            "state", "pending",
            "timeout", ARGV[3],
-           "deadline", ARGV[4])
+           "deadline", ARGV[4],
+           "pending_since", ARGV[5])
 redis.call("LPUSH", KEYS[2], ARGV[2])
 return 1
 `)
 
 // Enqueue adds the given task to the pending list of the queue.
-func (r *RDB) Enqueue(msg *base.TaskMessage) error {
+func (r *RDB) Enqueue(ctx context.Context, msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Enqueue"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -109,8 +124,9 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 		msg.ID,
 		msg.Timeout,
 		msg.Deadline,
+		r.clock.Now().UnixNano(),
 	}
-	n, err := r.runScriptWithErrorCode(op, enqueueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, enqueueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -131,6 +147,7 @@ func (r *RDB) Enqueue(msg *base.TaskMessage) error {
 // ARGV[3] -> task message data
 // ARGV[4] -> task timeout in seconds (0 if not timeout)
 // ARGV[5] -> task deadline in unix time (0 if no deadline)
+// ARGV[6] -> current unix time in nsec
 //
 // Output:
 // Returns 1 if successfully enqueued
@@ -149,6 +166,7 @@ redis.call("HSET", KEYS[2],
            "state", "pending",
            "timeout", ARGV[4],
            "deadline", ARGV[5],
+           "pending_since", ARGV[6],
            "unique_key", KEYS[1])
 redis.call("LPUSH", KEYS[3], ARGV[1])
 return 1
@@ -156,13 +174,13 @@ return 1
 
 // EnqueueUnique inserts the given task if the task's uniqueness lock can be acquired.
 // It returns ErrDuplicateTask if the lock cannot be acquired.
-func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
+func (r *RDB) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time.Duration) error {
 	var op errors.Op = "rdb.EnqueueUnique"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Internal, "cannot encode task message: %v", err)
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -176,8 +194,9 @@ func (r *RDB) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
 		encoded,
 		msg.Timeout,
 		msg.Deadline,
+		r.clock.Now().UnixNano(),
 	}
-	n, err := r.runScriptWithErrorCode(op, enqueueUniqueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, enqueueUniqueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -214,6 +233,7 @@ if redis.call("EXISTS", KEYS[2]) == 0 then
 	if id then
 		local key = ARGV[2] .. id
 		redis.call("HSET", key, "state", "active")
+		redis.call("HDEL", key, "pending_since")
 		local data = redis.call("HMGET", key, "msg", "timeout", "deadline")
 		local msg = data[1]	
 		local timeout = tonumber(data[2])
@@ -248,7 +268,7 @@ func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, deadline time.Ti
 			base.DeadlinesKey(qname),
 		}
 		argv := []interface{}{
-			time.Now().Unix(),
+			r.clock.Now().Unix(),
 			base.TaskKeyPrefix(qname),
 		}
 		res, err := dequeueCmd.Run(context.Background(), r.client, keys, argv...).Result()
@@ -284,8 +304,10 @@ func (r *RDB) Dequeue(qnames ...string) (msg *base.TaskMessage, deadline time.Ti
 // KEYS[2] -> asynq:{<qname>}:deadlines
 // KEYS[3] -> asynq:{<qname>}:t:<task_id>
 // KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
+// KEYS[5] -> asynq:{<qname>}:processed
 // ARGV[1] -> task ID
 // ARGV[2] -> stats expiration timestamp
+// ARGV[3] -> max int64 value
 var doneCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -300,6 +322,12 @@ local n = redis.call("INCR", KEYS[4])
 if tonumber(n) == 1 then
 	redis.call("EXPIREAT", KEYS[4], ARGV[2])
 end
+local total = redis.call("GET", KEYS[5])
+if tonumber(total) == tonumber(ARGV[3]) then
+	redis.call("SET", KEYS[5], 1)
+else
+	redis.call("INCR", KEYS[5])
+end
 return redis.status_reply("OK")
 `)
 
@@ -307,9 +335,11 @@ return redis.status_reply("OK")
 // KEYS[2] -> asynq:{<qname>}:deadlines
 // KEYS[3] -> asynq:{<qname>}:t:<task_id>
 // KEYS[4] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
-// KEYS[5] -> unique key
+// KEYS[5] -> asynq:{<qname>}:processed
+// KEYS[6] -> unique key
 // ARGV[1] -> task ID
 // ARGV[2] -> stats expiration timestamp
+// ARGV[3] -> max int64 value
 var doneUniqueCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -324,8 +354,14 @@ local n = redis.call("INCR", KEYS[4])
 if tonumber(n) == 1 then
 	redis.call("EXPIREAT", KEYS[4], ARGV[2])
 end
-if redis.call("GET", KEYS[5]) == ARGV[1] then
-  redis.call("DEL", KEYS[5])
+local total = redis.call("GET", KEYS[5])
+if tonumber(total) == tonumber(ARGV[3]) then
+	redis.call("SET", KEYS[5], 1)
+else
+	redis.call("INCR", KEYS[5])
+end
+if redis.call("GET", KEYS[6]) == ARGV[1] then
+  redis.call("DEL", KEYS[6])
 end
 return redis.status_reply("OK")
 `)
@@ -334,24 +370,27 @@ return redis.status_reply("OK")
 // It removes a uniqueness lock acquired by the task, if any.
 func (r *RDB) Done(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Done"
-	now := time.Now()
+	ctx := context.Background()
+	now := r.clock.Now()
 	expireAt := now.Add(statsTTL)
 	keys := []string{
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.TaskKey(msg.Queue, msg.ID),
 		base.ProcessedKey(msg.Queue, now),
+		base.ProcessedTotalKey(msg.Queue),
 	}
 	argv := []interface{}{
 		msg.ID,
 		expireAt.Unix(),
+		math.MaxInt64,
 	}
 	// Note: We cannot pass empty unique key when running this script in redis-cluster.
 	if len(msg.UniqueKey) > 0 {
 		keys = append(keys, msg.UniqueKey)
-		return r.runScript(op, doneUniqueCmd, keys, argv...)
+		return r.runScript(ctx, op, doneUniqueCmd, keys, argv...)
 	}
-	return r.runScript(op, doneCmd, keys, argv...)
+	return r.runScript(ctx, op, doneCmd, keys, argv...)
 }
 
 // KEYS[1] -> asynq:{<qname>}:active
@@ -359,10 +398,13 @@ func (r *RDB) Done(msg *base.TaskMessage) error {
 // KEYS[3] -> asynq:{<qname>}:completed
 // KEYS[4] -> asynq:{<qname>}:t:<task_id>
 // KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
+// KEYS[6] -> asynq:{<qname>}:processed
+//
 // ARGV[1] -> task ID
 // ARGV[2] -> stats expiration timestamp
 // ARGV[3] -> task exipration time in unix time
 // ARGV[4] -> task message data
+// ARGV[5] -> max int64 value
 var markAsCompleteCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -378,6 +420,12 @@ local n = redis.call("INCR", KEYS[5])
 if tonumber(n) == 1 then
 	redis.call("EXPIREAT", KEYS[5], ARGV[2])
 end
+local total = redis.call("GET", KEYS[6])
+if tonumber(total) == tonumber(ARGV[5]) then
+	redis.call("SET", KEYS[6], 1)
+else
+	redis.call("INCR", KEYS[6])
+end
 return redis.status_reply("OK")
 `)
 
@@ -386,11 +434,14 @@ return redis.status_reply("OK")
 // KEYS[3] -> asynq:{<qname>}:completed
 // KEYS[4] -> asynq:{<qname>}:t:<task_id>
 // KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
-// KEYS[6] -> asynq:{<qname>}:unique:{<checksum>}
+// KEYS[6] -> asynq:{<qname>}:processed
+// KEYS[7] -> asynq:{<qname>}:unique:{<checksum>}
+//
 // ARGV[1] -> task ID
 // ARGV[2] -> stats expiration timestamp
 // ARGV[3] -> task exipration time in unix time
 // ARGV[4] -> task message data
+// ARGV[5] -> max int64 value
 var markAsCompleteUniqueCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[1], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -406,8 +457,14 @@ local n = redis.call("INCR", KEYS[5])
 if tonumber(n) == 1 then
 	redis.call("EXPIREAT", KEYS[5], ARGV[2])
 end
-if redis.call("GET", KEYS[6]) == ARGV[1] then
-  redis.call("DEL", KEYS[6])
+local total = redis.call("GET", KEYS[6])
+if tonumber(total) == tonumber(ARGV[5]) then
+	redis.call("SET", KEYS[6], 1)
+else
+	redis.call("INCR", KEYS[6])
+end
+if redis.call("GET", KEYS[7]) == ARGV[1] then
+  redis.call("DEL", KEYS[7])
 end
 return redis.status_reply("OK")
 `)
@@ -416,7 +473,8 @@ return redis.status_reply("OK")
 // It removes a uniqueness lock acquired by the task, if any.
 func (r *RDB) MarkAsComplete(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.MarkAsComplete"
-	now := time.Now()
+	ctx := context.Background()
+	now := r.clock.Now()
 	statsExpireAt := now.Add(statsTTL)
 	msg.CompletedAt = now.Unix()
 	encoded, err := base.EncodeMessage(msg)
@@ -429,19 +487,21 @@ func (r *RDB) MarkAsComplete(msg *base.TaskMessage) error {
 		base.CompletedKey(msg.Queue),
 		base.TaskKey(msg.Queue, msg.ID),
 		base.ProcessedKey(msg.Queue, now),
+		base.ProcessedTotalKey(msg.Queue),
 	}
 	argv := []interface{}{
 		msg.ID,
 		statsExpireAt.Unix(),
 		now.Unix() + msg.Retention,
 		encoded,
+		math.MaxInt64,
 	}
 	// Note: We cannot pass empty unique key when running this script in redis-cluster.
 	if len(msg.UniqueKey) > 0 {
 		keys = append(keys, msg.UniqueKey)
-		return r.runScript(op, markAsCompleteUniqueCmd, keys, argv...)
+		return r.runScript(ctx, op, markAsCompleteUniqueCmd, keys, argv...)
 	}
-	return r.runScript(op, markAsCompleteCmd, keys, argv...)
+	return r.runScript(ctx, op, markAsCompleteCmd, keys, argv...)
 }
 
 // KEYS[1] -> asynq:{<qname>}:active
@@ -464,13 +524,14 @@ return redis.status_reply("OK")`)
 // Requeue moves the task from active queue to the specified queue.
 func (r *RDB) Requeue(msg *base.TaskMessage) error {
 	var op errors.Op = "rdb.Requeue"
+	ctx := context.Background()
 	keys := []string{
 		base.ActiveKey(msg.Queue),
 		base.DeadlinesKey(msg.Queue),
 		base.PendingKey(msg.Queue),
 		base.TaskKey(msg.Queue, msg.ID),
 	}
-	return r.runScript(op, requeueCmd, keys, msg.ID)
+	return r.runScript(ctx, op, requeueCmd, keys, msg.ID)
 }
 
 // KEYS[1] -> asynq:{<qname>}:t:<task_id>
@@ -498,13 +559,13 @@ return 1
 `)
 
 // Schedule adds the task to the scheduled set to be processed in the future.
-func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
+func (r *RDB) Schedule(ctx context.Context, msg *base.TaskMessage, processAt time.Time) error {
 	var op errors.Op = "rdb.Schedule"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("cannot encode message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -518,7 +579,7 @@ func (r *RDB) Schedule(msg *base.TaskMessage, processAt time.Time) error {
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, scheduleCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, scheduleCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -562,13 +623,13 @@ return 1
 
 // ScheduleUnique adds the task to the backlog queue to be processed in the future if the uniqueness lock can be acquired.
 // It returns ErrDuplicateTask if the lock cannot be acquired.
-func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
+func (r *RDB) ScheduleUnique(ctx context.Context, msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
 	var op errors.Op = "rdb.ScheduleUnique"
 	encoded, err := base.EncodeMessage(msg)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode task message: %v", err))
 	}
-	if err := r.client.SAdd(context.Background(), base.AllQueues, msg.Queue).Err(); err != nil {
+	if err := r.client.SAdd(ctx, base.AllQueues, msg.Queue).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
 	keys := []string{
@@ -584,7 +645,7 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 		msg.Timeout,
 		msg.Deadline,
 	}
-	n, err := r.runScriptWithErrorCode(op, scheduleUniqueCmd, keys, argv...)
+	n, err := r.runScriptWithErrorCode(ctx, op, scheduleUniqueCmd, keys, argv...)
 	if err != nil {
 		return err
 	}
@@ -603,11 +664,15 @@ func (r *RDB) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl tim
 // KEYS[4] -> asynq:{<qname>}:retry
 // KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
 // KEYS[6] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
+// KEYS[7] -> asynq:{<qname>}:processed
+// KEYS[8] -> asynq:{<qname>}:failed
+//
 // ARGV[1] -> task ID
 // ARGV[2] -> updated base.TaskMessage value
 // ARGV[3] -> retry_at UNIX timestamp
 // ARGV[4] -> stats expiration timestamp
 // ARGV[5] -> is_failure (bool)
+// ARGV[6] -> max int64 value
 var retryCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[2], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -626,6 +691,14 @@ if tonumber(ARGV[5]) == 1 then
 	if tonumber(m) == 1 then
 		redis.call("EXPIREAT", KEYS[6], ARGV[4])
 	end
+    local total = redis.call("GET", KEYS[7])
+    if tonumber(total) == tonumber(ARGV[6]) then
+    	redis.call("SET", KEYS[7], 1)
+    	redis.call("SET", KEYS[8], 1)
+    else
+    	redis.call("INCR", KEYS[7])
+    	redis.call("INCR", KEYS[8])
+    end
 end
 return redis.status_reply("OK")`)
 
@@ -634,7 +707,8 @@ return redis.status_reply("OK")`)
 // if isFailure is true increments the retried counter.
 func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {
 	var op errors.Op = "rdb.Retry"
-	now := time.Now()
+	ctx := context.Background()
+	now := r.clock.Now()
 	modified := *msg
 	if isFailure {
 		modified.Retried++
@@ -653,6 +727,8 @@ func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, i
 		base.RetryKey(msg.Queue),
 		base.ProcessedKey(msg.Queue, now),
 		base.FailedKey(msg.Queue, now),
+		base.ProcessedTotalKey(msg.Queue),
+		base.FailedTotalKey(msg.Queue),
 	}
 	argv := []interface{}{
 		msg.ID,
@@ -660,8 +736,9 @@ func (r *RDB) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, i
 		processAt.Unix(),
 		expireAt.Unix(),
 		isFailure,
+		math.MaxInt64,
 	}
-	return r.runScript(op, retryCmd, keys, argv...)
+	return r.runScript(ctx, op, retryCmd, keys, argv...)
 }
 
 const (
@@ -675,12 +752,16 @@ const (
 // KEYS[4] -> asynq:{<qname>}:archived
 // KEYS[5] -> asynq:{<qname>}:processed:<yyyy-mm-dd>
 // KEYS[6] -> asynq:{<qname>}:failed:<yyyy-mm-dd>
+// KEYS[7] -> asynq:{<qname>}:processed
+// KEYS[8] -> asynq:{<qname>}:failed
+//
 // ARGV[1] -> task ID
 // ARGV[2] -> updated base.TaskMessage value
 // ARGV[3] -> died_at UNIX timestamp
 // ARGV[4] -> cutoff timestamp (e.g., 90 days ago)
 // ARGV[5] -> max number of tasks in archive (e.g., 100)
 // ARGV[6] -> stats expiration timestamp
+// ARGV[7] -> max int64 value
 var archiveCmd = redis.NewScript(`
 if redis.call("LREM", KEYS[2], 0, ARGV[1]) == 0 then
   return redis.error_reply("NOT FOUND")
@@ -700,13 +781,22 @@ local m = redis.call("INCR", KEYS[6])
 if tonumber(m) == 1 then
 	redis.call("EXPIREAT", KEYS[6], ARGV[6])
 end
+local total = redis.call("GET", KEYS[7])
+if tonumber(total) == tonumber(ARGV[7]) then
+   	redis.call("SET", KEYS[7], 1)
+   	redis.call("SET", KEYS[8], 1)
+else
+  	redis.call("INCR", KEYS[7])
+   	redis.call("INCR", KEYS[8])
+end
 return redis.status_reply("OK")`)
 
 // Archive sends the given task to archive, attaching the error message to the task.
 // It also trims the archive by timestamp and set size.
 func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 	var op errors.Op = "rdb.Archive"
-	now := time.Now()
+	ctx := context.Background()
+	now := r.clock.Now()
 	modified := *msg
 	modified.ErrorMsg = errMsg
 	modified.LastFailedAt = now.Unix()
@@ -723,6 +813,8 @@ func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 		base.ArchivedKey(msg.Queue),
 		base.ProcessedKey(msg.Queue, now),
 		base.FailedKey(msg.Queue, now),
+		base.ProcessedTotalKey(msg.Queue),
+		base.FailedTotalKey(msg.Queue),
 	}
 	argv := []interface{}{
 		msg.ID,
@@ -731,8 +823,9 @@ func (r *RDB) Archive(msg *base.TaskMessage, errMsg string) error {
 		cutoff.Unix(),
 		maxArchiveSize,
 		expireAt.Unix(),
+		math.MaxInt64,
 	}
-	return r.runScript(op, archiveCmd, keys, argv...)
+	return r.runScript(ctx, op, archiveCmd, keys, argv...)
 }
 
 // ForwardIfReady checks scheduled and retry sets of the given queues
@@ -749,23 +842,27 @@ func (r *RDB) ForwardIfReady(qnames ...string) error {
 
 // KEYS[1] -> source queue (e.g. asynq:{<qname>:scheduled or asynq:{<qname>}:retry})
 // KEYS[2] -> asynq:{<qname>}:pending
-// ARGV[1] -> current unix time
+// ARGV[1] -> current unix time in seconds
 // ARGV[2] -> task key prefix
+// ARGV[3] -> current unix time in nsec
 // Note: Script moves tasks up to 100 at a time to keep the runtime of script short.
 var forwardCmd = redis.NewScript(`
 local ids = redis.call("ZRANGEBYSCORE", KEYS[1], "-inf", ARGV[1], "LIMIT", 0, 100)
 for _, id in ipairs(ids) do
 	redis.call("LPUSH", KEYS[2], id)
 	redis.call("ZREM", KEYS[1], id)
-	redis.call("HSET", ARGV[2] .. id, "state", "pending")
+	redis.call("HSET", ARGV[2] .. id,
+               "state", "pending",
+               "pending_since", ARGV[3])
 end
 return table.getn(ids)`)
 
 // forward moves tasks with a score less than the current unix time
 // from the src zset to the dst list. It returns the number of tasks moved.
 func (r *RDB) forward(src, dst, taskKeyPrefix string) (int, error) {
-	now := float64(time.Now().Unix())
-	res, err := forwardCmd.Run(context.Background(), r.client, []string{src, dst}, now, taskKeyPrefix).Result()
+	now := r.clock.Now()
+	res, err := forwardCmd.Run(context.Background(), r.client,
+		[]string{src, dst}, now.Unix(), taskKeyPrefix, now.UnixNano()).Result()
 	if err != nil {
 		return 0, errors.E(errors.Internal, fmt.Sprintf("redis eval error: %v", err))
 	}
@@ -830,7 +927,7 @@ func (r *RDB) deleteExpiredCompletedTasks(qname string, batchSize int) (int64, e
 	var op errors.Op = "rdb.DeleteExpiredCompletedTasks"
 	keys := []string{base.CompletedKey(qname)}
 	argv := []interface{}{
-		time.Now().Unix(),
+		r.clock.Now().Unix(),
 		base.TaskKeyPrefix(qname),
 		batchSize,
 	}
@@ -903,11 +1000,12 @@ return redis.status_reply("OK")`)
 // WriteServerState writes server state data to redis with expiration set to the value ttl.
 func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo, ttl time.Duration) error {
 	var op errors.Op = "rdb.WriteServerState"
+	ctx := context.Background()
 	bytes, err := base.EncodeServerInfo(info)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode server info: %v", err))
 	}
-	exp := time.Now().Add(ttl).UTC()
+	exp := r.clock.Now().Add(ttl).UTC()
 	args := []interface{}{ttl.Seconds(), bytes} // args to the lua script
 	for _, w := range workers {
 		bytes, err := base.EncodeWorkerInfo(w)
@@ -918,13 +1016,13 @@ func (r *RDB) WriteServerState(info *base.ServerInfo, workers []*base.WorkerInfo
 	}
 	skey := base.ServerInfoKey(info.Host, info.PID, info.ServerID)
 	wkey := base.WorkersKey(info.Host, info.PID, info.ServerID)
-	if err := r.client.ZAdd(context.Background(), base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
+	if err := r.client.ZAdd(ctx, base.AllServers, &redis.Z{Score: float64(exp.Unix()), Member: skey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "sadd", Err: err})
 	}
-	if err := r.client.ZAdd(context.Background(), base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
+	if err := r.client.ZAdd(ctx, base.AllWorkers, &redis.Z{Score: float64(exp.Unix()), Member: wkey}).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
-	return r.runScript(op, writeServerStateCmd, []string{skey, wkey}, args...)
+	return r.runScript(ctx, op, writeServerStateCmd, []string{skey, wkey}, args...)
 }
 
 // KEYS[1] -> asynq:servers:{<host:pid:sid>}
@@ -937,15 +1035,16 @@ return redis.status_reply("OK")`)
 // ClearServerState deletes server state data from redis.
 func (r *RDB) ClearServerState(host string, pid int, serverID string) error {
 	var op errors.Op = "rdb.ClearServerState"
+	ctx := context.Background()
 	skey := base.ServerInfoKey(host, pid, serverID)
 	wkey := base.WorkersKey(host, pid, serverID)
-	if err := r.client.ZRem(context.Background(), base.AllServers, skey).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllServers, skey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.ZRem(context.Background(), base.AllWorkers, wkey).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllWorkers, wkey).Err(); err != nil {
 		return errors.E(op, errors.Internal, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	return r.runScript(op, clearServerStateCmd, []string{skey, wkey})
+	return r.runScript(ctx, op, clearServerStateCmd, []string{skey, wkey})
 }
 
 // KEYS[1]  -> asynq:schedulers:{<schedulerID>}
@@ -962,6 +1061,7 @@ return redis.status_reply("OK")`)
 // WriteSchedulerEntries writes scheduler entries data to redis with expiration set to the value ttl.
 func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.SchedulerEntry, ttl time.Duration) error {
 	var op errors.Op = "rdb.WriteSchedulerEntries"
+	ctx := context.Background()
 	args := []interface{}{ttl.Seconds()}
 	for _, e := range entries {
 		bytes, err := base.EncodeSchedulerEntry(e)
@@ -970,23 +1070,24 @@ func (r *RDB) WriteSchedulerEntries(schedulerID string, entries []*base.Schedule
 		}
 		args = append(args, bytes)
 	}
-	exp := time.Now().Add(ttl).UTC()
+	exp := r.clock.Now().Add(ttl).UTC()
 	key := base.SchedulerEntriesKey(schedulerID)
-	err := r.client.ZAdd(context.Background(), base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
+	err := r.client.ZAdd(ctx, base.AllSchedulers, &redis.Z{Score: float64(exp.Unix()), Member: key}).Err()
 	if err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zadd", Err: err})
 	}
-	return r.runScript(op, writeSchedulerEntriesCmd, []string{key}, args...)
+	return r.runScript(ctx, op, writeSchedulerEntriesCmd, []string{key}, args...)
 }
 
 // ClearSchedulerEntries deletes scheduler entries data from redis.
 func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 	var op errors.Op = "rdb.ClearSchedulerEntries"
+	ctx := context.Background()
 	key := base.SchedulerEntriesKey(scheduelrID)
-	if err := r.client.ZRem(context.Background(), base.AllSchedulers, key).Err(); err != nil {
+	if err := r.client.ZRem(ctx, base.AllSchedulers, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "zrem", Err: err})
 	}
-	if err := r.client.Del(context.Background(), key).Err(); err != nil {
+	if err := r.client.Del(ctx, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -995,8 +1096,9 @@ func (r *RDB) ClearSchedulerEntries(scheduelrID string) error {
 // CancelationPubSub returns a pubsub for cancelation messages.
 func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 	var op errors.Op = "rdb.CancelationPubSub"
-	pubsub := r.client.Subscribe(context.Background(), base.CancelChannel)
-	_, err := pubsub.Receive(context.Background())
+	ctx := context.Background()
+	pubsub := r.client.Subscribe(ctx, base.CancelChannel)
+	_, err := pubsub.Receive(ctx)
 	if err != nil {
 		return nil, errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub receive error: %v", err))
 	}
@@ -1007,7 +1109,8 @@ func (r *RDB) CancelationPubSub() (*redis.PubSub, error) {
 // The message is the ID for the task to be canceled.
 func (r *RDB) PublishCancelation(id string) error {
 	var op errors.Op = "rdb.PublishCancelation"
-	if err := r.client.Publish(context.Background(), base.CancelChannel, id).Err(); err != nil {
+	ctx := context.Background()
+	if err := r.client.Publish(ctx, base.CancelChannel, id).Err(); err != nil {
 		return errors.E(op, errors.Unknown, fmt.Sprintf("redis pubsub publish error: %v", err))
 	}
 	return nil
@@ -1028,6 +1131,7 @@ const maxEvents = 1000
 // RecordSchedulerEnqueueEvent records the time when the given task was enqueued.
 func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerEnqueueEvent) error {
 	var op errors.Op = "rdb.RecordSchedulerEnqueueEvent"
+	ctx := context.Background()
 	data, err := base.EncodeSchedulerEnqueueEvent(event)
 	if err != nil {
 		return errors.E(op, errors.Internal, fmt.Sprintf("cannot encode scheduler enqueue event: %v", err))
@@ -1040,14 +1144,15 @@ func (r *RDB) RecordSchedulerEnqueueEvent(entryID string, event *base.SchedulerE
 		data,
 		maxEvents,
 	}
-	return r.runScript(op, recordSchedulerEnqueueEventCmd, keys, argv...)
+	return r.runScript(ctx, op, recordSchedulerEnqueueEventCmd, keys, argv...)
 }
 
 // ClearSchedulerHistory deletes the enqueue event history for the given scheduler entry.
 func (r *RDB) ClearSchedulerHistory(entryID string) error {
 	var op errors.Op = "rdb.ClearSchedulerHistory"
+	ctx := context.Background()
 	key := base.SchedulerHistoryKey(entryID)
-	if err := r.client.Del(context.Background(), key).Err(); err != nil {
+	if err := r.client.Del(ctx, key).Err(); err != nil {
 		return errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "del", Err: err})
 	}
 	return nil
@@ -1056,8 +1161,9 @@ func (r *RDB) ClearSchedulerHistory(entryID string) error {
 // WriteResult writes the given result data for the specified task.
 func (r *RDB) WriteResult(qname, taskID string, data []byte) (int, error) {
 	var op errors.Op = "rdb.WriteResult"
+	ctx := context.Background()
 	taskKey := base.TaskKey(qname, taskID)
-	if err := r.client.HSet(context.Background(), taskKey, "result", data).Err(); err != nil {
+	if err := r.client.HSet(ctx, taskKey, "result", data).Err(); err != nil {
 		return 0, errors.E(op, errors.Unknown, &errors.RedisCommandError{Command: "hset", Err: err})
 	}
 	return len(data), nil

internal/rdb/rdb_test.go

@@ -21,6 +21,7 @@ import (
 	h "github.com/hibiken/asynq/internal/asynqtest"
 	"github.com/hibiken/asynq/internal/base"
 	"github.com/hibiken/asynq/internal/errors"
+	"github.com/hibiken/asynq/internal/timeutil"
 )
 
 // variables used for package testing.
@@ -67,6 +68,9 @@ func TestEnqueue(t *testing.T) {
 	t2 := h.NewTaskMessageWithQueue("generate_csv", h.JSON(map[string]interface{}{}), "csv")
 	t3 := h.NewTaskMessageWithQueue("sync", nil, "low")
 
+	enqueueTime := time.Now()
+	r.SetClock(timeutil.NewSimulatedClock(enqueueTime))
+
 	tests := []struct {
 		msg *base.TaskMessage
 	}{
@@ -78,7 +82,7 @@ func TestEnqueue(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		err := r.Enqueue(tc.msg)
+		err := r.Enqueue(context.Background(), tc.msg)
 		if err != nil {
 			t.Errorf("(*RDB).Enqueue(msg) = %v, want nil", err)
 			continue
@@ -115,6 +119,10 @@ func TestEnqueue(t *testing.T) {
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-key is set to %v, want %v", deadline, want)
 		}
+		pendingSince := r.client.HGet(context.Background(), taskKey, "pending_since").Val() // "pending_since" field
+		if want := strconv.Itoa(int(enqueueTime.UnixNano())); pendingSince != want {
+			t.Errorf("pending_since field under task-key is set to %v, want %v", pendingSince, want)
+		}
 
 		// Check queue is in the AllQueues set.
 		if !r.client.SIsMember(context.Background(), base.AllQueues, tc.msg.Queue).Val() {
@@ -148,11 +156,11 @@ func TestEnqueueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.Enqueue(tc.firstMsg); err != nil {
+		if err := r.Enqueue(context.Background(), tc.firstMsg); err != nil {
 			t.Errorf("First message: Enqueue failed: %v", err)
 			continue
 		}
-		if err := r.Enqueue(tc.secondMsg); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.Enqueue(context.Background(), tc.secondMsg); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: Enqueue returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -170,6 +178,9 @@ func TestEnqueueUnique(t *testing.T) {
 		UniqueKey: base.UniqueKey(base.DefaultQueueName, "email", h.JSON(map[string]interface{}{"user_id": 123})),
 	}
 
+	enqueueTime := time.Now()
+	r.SetClock(timeutil.NewSimulatedClock(enqueueTime))
+
 	tests := []struct {
 		msg *base.TaskMessage
 		ttl time.Duration // uniqueness ttl
@@ -181,7 +192,7 @@ func TestEnqueueUnique(t *testing.T) {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
 		// Enqueue the first message, should succeed.
-		err := r.EnqueueUnique(tc.msg, tc.ttl)
+		err := r.EnqueueUnique(context.Background(), tc.msg, tc.ttl)
 		if err != nil {
 			t.Errorf("First message: (*RDB).EnqueueUnique(%v, %v) = %v, want nil",
 				tc.msg, tc.ttl, err)
@@ -230,6 +241,10 @@ func TestEnqueueUnique(t *testing.T) {
 		if want := strconv.Itoa(int(tc.msg.Deadline)); deadline != want {
 			t.Errorf("deadline field under task-key is set to %v, want %v", deadline, want)
 		}
+		pendingSince := r.client.HGet(context.Background(), taskKey, "pending_since").Val() // "pending_since" field
+		if want := strconv.Itoa(int(enqueueTime.UnixNano())); pendingSince != want {
+			t.Errorf("pending_since field under task-key is set to %v, want %v", pendingSince, want)
+		}
 		uniqueKey := r.client.HGet(context.Background(), taskKey, "unique_key").Val() // "unique_key" field
 		if uniqueKey != tc.msg.UniqueKey {
 			t.Errorf("uniqueue_key field under task key is set to %q, want %q", uniqueKey, tc.msg.UniqueKey)
@@ -241,7 +256,7 @@ func TestEnqueueUnique(t *testing.T) {
 		}
 
 		// Enqueue the second message, should fail.
-		got := r.EnqueueUnique(tc.msg, tc.ttl)
+		got := r.EnqueueUnique(context.Background(), tc.msg, tc.ttl)
 		if !errors.Is(got, errors.ErrDuplicateTask) {
 			t.Errorf("Second message: (*RDB).EnqueueUnique(msg, ttl) = %v, want %v", got, errors.ErrDuplicateTask)
 			continue
@@ -282,11 +297,11 @@ func TestEnqueueUniqueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.EnqueueUnique(tc.firstMsg, ttl); err != nil {
+		if err := r.EnqueueUnique(context.Background(), tc.firstMsg, ttl); err != nil {
 			t.Errorf("First message: EnqueueUnique failed: %v", err)
 			continue
 		}
-		if err := r.EnqueueUnique(tc.secondMsg, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.EnqueueUnique(context.Background(), tc.secondMsg, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: EnqueueUnique returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -792,18 +807,59 @@ func TestDone(t *testing.T) {
 		if gotProcessed != "1" {
 			t.Errorf("%s; GET %q = %q, want 1", tc.desc, processedKey, gotProcessed)
 		}
-
 		gotTTL := r.client.TTL(context.Background(), processedKey).Val()
 		if gotTTL > statsTTL {
 			t.Errorf("%s; TTL %q = %v, want less than or equal to %v", tc.desc, processedKey, gotTTL, statsTTL)
 		}
 
+		processedTotalKey := base.ProcessedTotalKey(tc.target.Queue)
+		gotProcessedTotal := r.client.Get(context.Background(), processedTotalKey).Val()
+		if gotProcessedTotal != "1" {
+			t.Errorf("%s; GET %q = %q, want 1", tc.desc, processedTotalKey, gotProcessedTotal)
+		}
+
 		if len(tc.target.UniqueKey) > 0 && r.client.Exists(context.Background(), tc.target.UniqueKey).Val() != 0 {
 			t.Errorf("%s; Uniqueness lock %q still exists", tc.desc, tc.target.UniqueKey)
 		}
 	}
 }
 
+// Make sure that processed_total counter wraps to 1 when reaching int64 max value.
+func TestDoneWithMaxCounter(t *testing.T) {
+	r := setup(t)
+	defer r.Close()
+	msg := &base.TaskMessage{
+		ID:       uuid.NewString(),
+		Type:     "foo",
+		Payload:  nil,
+		Timeout:  1800,
+		Deadline: 0,
+		Queue:    "default",
+	}
+
+	z := base.Z{
+		Message: msg,
+		Score:   time.Now().Add(5 * time.Minute).Unix(),
+	}
+	h.SeedDeadlines(t, r.client, []base.Z{z}, msg.Queue)
+	h.SeedActiveQueue(t, r.client, []*base.TaskMessage{msg}, msg.Queue)
+
+	processedTotalKey := base.ProcessedTotalKey(msg.Queue)
+	ctx := context.Background()
+	if err := r.client.Set(ctx, processedTotalKey, base.MaxInt64, 0).Err(); err != nil {
+		t.Fatalf("Redis command failed: SET %q %v", processedTotalKey, base.MaxInt64)
+	}
+
+	if err := r.Done(msg); err != nil {
+		t.Fatalf("RDB.Done failed: %v", err)
+	}
+
+	gotProcessedTotal := r.client.Get(ctx, processedTotalKey).Val()
+	if gotProcessedTotal != "1" {
+		t.Errorf("GET %q = %v, want 1", processedTotalKey, gotProcessedTotal)
+	}
+}
+
 func TestMarkAsComplete(t *testing.T) {
 	r := setup(t)
 	defer r.Close()
@@ -1162,7 +1218,7 @@ func TestSchedule(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case
 
-		err := r.Schedule(tc.msg, tc.processAt)
+		err := r.Schedule(context.Background(), tc.msg, tc.processAt)
 		if err != nil {
 			t.Errorf("(*RDB).Schedule(%v, %v) = %v, want nil",
 				tc.msg, tc.processAt, err)
@@ -1245,11 +1301,11 @@ func TestScheduleTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.Schedule(tc.firstMsg, processAt); err != nil {
+		if err := r.Schedule(context.Background(), tc.firstMsg, processAt); err != nil {
 			t.Errorf("First message: Schedule failed: %v", err)
 			continue
 		}
-		if err := r.Schedule(tc.secondMsg, processAt); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.Schedule(context.Background(), tc.secondMsg, processAt); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: Schedule returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -1279,7 +1335,7 @@ func TestScheduleUnique(t *testing.T) {
 		h.FlushDB(t, r.client) // clean up db before each test case
 
 		desc := "(*RDB).ScheduleUnique(msg, processAt, ttl)"
-		err := r.ScheduleUnique(tc.msg, tc.processAt, tc.ttl)
+		err := r.ScheduleUnique(context.Background(), tc.msg, tc.processAt, tc.ttl)
 		if err != nil {
 			t.Errorf("Frist task: %s = %v, want nil", desc, err)
 			continue
@@ -1336,7 +1392,7 @@ func TestScheduleUnique(t *testing.T) {
 		}
 
 		// Enqueue the second message, should fail.
-		got := r.ScheduleUnique(tc.msg, tc.processAt, tc.ttl)
+		got := r.ScheduleUnique(context.Background(), tc.msg, tc.processAt, tc.ttl)
 		if !errors.Is(got, errors.ErrDuplicateTask) {
 			t.Errorf("Second task: %s = %v, want %v", desc, got, errors.ErrDuplicateTask)
 			continue
@@ -1379,11 +1435,11 @@ func TestScheduleUniqueTaskIdConflictError(t *testing.T) {
 	for _, tc := range tests {
 		h.FlushDB(t, r.client) // clean up db before each test case.
 
-		if err := r.ScheduleUnique(tc.firstMsg, processAt, ttl); err != nil {
+		if err := r.ScheduleUnique(context.Background(), tc.firstMsg, processAt, ttl); err != nil {
 			t.Errorf("First message: ScheduleUnique failed: %v", err)
 			continue
 		}
-		if err := r.ScheduleUnique(tc.secondMsg, processAt, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
+		if err := r.ScheduleUnique(context.Background(), tc.secondMsg, processAt, ttl); !errors.Is(err, errors.ErrTaskIdConflict) {
 			t.Errorf("Second message: ScheduleUnique returned %v, want %v", err, errors.ErrTaskIdConflict)
 			continue
 		}
@@ -1558,6 +1614,18 @@ func TestRetry(t *testing.T) {
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", failedKey, gotTTL, statsTTL)
 		}
+
+		processedTotalKey := base.ProcessedTotalKey(tc.msg.Queue)
+		gotProcessedTotal := r.client.Get(context.Background(), processedTotalKey).Val()
+		if gotProcessedTotal != "1" {
+			t.Errorf("GET %q = %q, want 1", processedTotalKey, gotProcessedTotal)
+		}
+
+		failedTotalKey := base.FailedTotalKey(tc.msg.Queue)
+		gotFailedTotal := r.client.Get(context.Background(), failedTotalKey).Val()
+		if gotFailedTotal != "1" {
+			t.Errorf("GET %q = %q, want 1", failedTotalKey, gotFailedTotal)
+		}
 	}
 }
 
@@ -1725,6 +1793,18 @@ func TestRetryWithNonFailureError(t *testing.T) {
 		if gotFailed != "" {
 			t.Errorf("GET %q = %q, want empty", failedKey, gotFailed)
 		}
+
+		processedTotalKey := base.ProcessedTotalKey(tc.msg.Queue)
+		gotProcessedTotal := r.client.Get(context.Background(), processedTotalKey).Val()
+		if gotProcessedTotal != "" {
+			t.Errorf("GET %q = %q, want empty", processedTotalKey, gotProcessedTotal)
+		}
+
+		failedTotalKey := base.FailedTotalKey(tc.msg.Queue)
+		gotFailedTotal := r.client.Get(context.Background(), failedTotalKey).Val()
+		if gotFailedTotal != "" {
+			t.Errorf("GET %q = %q, want empty", failedTotalKey, gotFailedTotal)
+		}
 	}
 }
 
@@ -1935,6 +2015,18 @@ func TestArchive(t *testing.T) {
 		if gotTTL > statsTTL {
 			t.Errorf("TTL %q = %v, want less than or equal to %v", failedKey, gotTTL, statsTTL)
 		}
+
+		processedTotalKey := base.ProcessedTotalKey(tc.target.Queue)
+		gotProcessedTotal := r.client.Get(context.Background(), processedTotalKey).Val()
+		if gotProcessedTotal != "1" {
+			t.Errorf("GET %q = %q, want 1", processedTotalKey, gotProcessedTotal)
+		}
+
+		failedTotalKey := base.FailedTotalKey(tc.target.Queue)
+		gotFailedTotal := r.client.Get(context.Background(), failedTotalKey).Val()
+		if gotFailedTotal != "1" {
+			t.Errorf("GET %q = %q, want 1", failedTotalKey, gotFailedTotal)
+		}
 	}
 }
 
@@ -2055,6 +2147,9 @@ func TestForwardIfReady(t *testing.T) {
 		h.SeedAllScheduledQueues(t, r.client, tc.scheduled)
 		h.SeedAllRetryQueues(t, r.client, tc.retry)
 
+		now := time.Now()
+		r.SetClock(timeutil.NewSimulatedClock(now))
+
 		err := r.ForwardIfReady(tc.qnames...)
 		if err != nil {
 			t.Errorf("(*RDB).CheckScheduled(%v) = %v, want nil", tc.qnames, err)
@@ -2066,6 +2161,13 @@ func TestForwardIfReady(t *testing.T) {
 			if diff := cmp.Diff(want, gotPending, h.SortMsgOpt); diff != "" {
 				t.Errorf("mismatch found in %q; (-want, +got)\n%s", base.PendingKey(qname), diff)
 			}
+			// Make sure "pending_since" field is set
+			for _, msg := range gotPending {
+				pendingSince := r.client.HGet(context.Background(), base.TaskKey(msg.Queue, msg.ID), "pending_since").Val()
+				if want := strconv.Itoa(int(now.UnixNano())); pendingSince != want {
+					t.Error("pending_since field is not set for newly pending message")
+				}
+			}
 		}
 		for qname, want := range tc.wantScheduled {
 			gotScheduled := h.GetScheduledMessages(t, r.client, qname)

internal/testbroker/testbroker.go

@@ -6,6 +6,7 @@
 package testbroker
 
 import (
+	"context"
 	"errors"
 	"sync"
 	"time"
@@ -45,22 +46,22 @@ func (tb *TestBroker) Wakeup() {
 	tb.sleeping = false
 }
 
-func (tb *TestBroker) Enqueue(msg *base.TaskMessage) error {
+func (tb *TestBroker) Enqueue(ctx context.Context, msg *base.TaskMessage) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Enqueue(msg)
+	return tb.real.Enqueue(ctx, msg)
 }
 
-func (tb *TestBroker) EnqueueUnique(msg *base.TaskMessage, ttl time.Duration) error {
+func (tb *TestBroker) EnqueueUnique(ctx context.Context, msg *base.TaskMessage, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.EnqueueUnique(msg, ttl)
+	return tb.real.EnqueueUnique(ctx, msg, ttl)
 }
 
 func (tb *TestBroker) Dequeue(qnames ...string) (*base.TaskMessage, time.Time, error) {
@@ -99,22 +100,22 @@ func (tb *TestBroker) Requeue(msg *base.TaskMessage) error {
 	return tb.real.Requeue(msg)
 }
 
-func (tb *TestBroker) Schedule(msg *base.TaskMessage, processAt time.Time) error {
+func (tb *TestBroker) Schedule(ctx context.Context, msg *base.TaskMessage, processAt time.Time) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.Schedule(msg, processAt)
+	return tb.real.Schedule(ctx, msg, processAt)
 }
 
-func (tb *TestBroker) ScheduleUnique(msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
+func (tb *TestBroker) ScheduleUnique(ctx context.Context, msg *base.TaskMessage, processAt time.Time, ttl time.Duration) error {
 	tb.mu.Lock()
 	defer tb.mu.Unlock()
 	if tb.sleeping {
 		return errRedisDown
 	}
-	return tb.real.ScheduleUnique(msg, processAt, ttl)
+	return tb.real.ScheduleUnique(ctx, msg, processAt, ttl)
 }
 
 func (tb *TestBroker) Retry(msg *base.TaskMessage, processAt time.Time, errMsg string, isFailure bool) error {

internal/timeutil/timeutil.go

@@ -0,0 +1,38 @@
+// Package timeutil exports functions and types related to time and date.
+package timeutil
+
+import "time"
+
+// A Clock is an object that can tell you the current time.
+//
+// This interface allows decoupling code that uses time from the code that creates
+// a point in time. You can use this to your advantage by injecting Clocks into interfaces
+// rather than having implementations call time.Now() directly.
+//
+// Use RealClock() in production.
+// Use SimulatedClock() in test.
+type Clock interface {
+	Now() time.Time
+}
+
+func NewRealClock() Clock { return &realTimeClock{} }
+
+type realTimeClock struct{}
+
+func (_ *realTimeClock) Now() time.Time { return time.Now() }
+
+// A SimulatedClock is a concrete Clock implementation that doesn't "tick" on its own.
+// Time is advanced by explicit call to the AdvanceTime() or SetTime() functions.
+type SimulatedClock struct {
+	t time.Time
+}
+
+func NewSimulatedClock(t time.Time) *SimulatedClock {
+	return &SimulatedClock{t}
+}
+
+func (c *SimulatedClock) Now() time.Time { return c.t }
+
+func (c *SimulatedClock) SetTime(t time.Time) { c.t = t }
+
+func (c *SimulatedClock) AdvanceTime(d time.Duration) { c.t.Add(d) }

processor_test.go

@@ -126,7 +126,7 @@ func TestProcessorSuccessWithSingleQueue(t *testing.T) {
 
 		p.start(&sync.WaitGroup{})
 		for _, msg := range tc.incoming {
-			err := rdbClient.Enqueue(msg)
+			err := rdbClient.Enqueue(context.Background(), msg)
 			if err != nil {
 				p.shutdown()
 				t.Fatal(err)

server.go

@@ -57,7 +57,7 @@ type Config struct {
 	// Maximum number of concurrent processing of tasks.
 	//
 	// If set to a zero or negative value, NewServer will overwrite the value
-	// to the number of CPUs usable by the currennt process.
+	// to the number of CPUs usable by the current process.
 	Concurrency int
 
 	// Function to calculate retry delay for a failed task.

tools/go.mod

@@ -4,12 +4,17 @@ go 1.13
 
 require (
 	github.com/fatih/color v1.9.0
-	github.com/go-redis/redis/v8 v8.11.2
-	github.com/google/uuid v1.2.0
-	github.com/hibiken/asynq v0.17.1
+	github.com/go-redis/redis/v8 v8.11.4
+	github.com/google/uuid v1.3.0
+	github.com/hibiken/asynq v0.19.0
+	github.com/hibiken/asynq/x v0.0.0-00010101000000-000000000000
 	github.com/mitchellh/go-homedir v1.1.0
+	github.com/prometheus/client_golang v1.11.0
 	github.com/spf13/cobra v1.1.1
 	github.com/spf13/viper v1.7.0
 )
 
-replace github.com/hibiken/asynq => ./..
+replace (
+	github.com/hibiken/asynq => ./..
+	github.com/hibiken/asynq/x => ./../x
+)

tools/go.sum

@@ -16,12 +16,18 @@ github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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@@ -29,6 +35,8 @@ github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
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@@ -54,11 +62,17 @@ github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4
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@@ -77,6 +91,10 @@ github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvq
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@@ -84,14 +102,19 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
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@@ -125,14 +148,19 @@ github.com/hpcloud/tail v1.0.0/go.mod h1:ab1qPbhIpdTxEkNHXyeSf5vhxWSCs/tWer42PpO
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@@ -148,6 +176,7 @@ github.com/mattn/go-isatty v0.0.3/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNx
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@@ -160,37 +189,62 @@ github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0Qu
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+github.com/prometheus/client_model v0.2.0/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/prometheus/common v0.0.0-20181113130724-41aa239b4cce/go.mod h1:daVV7qP5qjZbuso7PdcryaAu0sAZbrN9i7WWcTMWvro=
+github.com/prometheus/common v0.4.0 h1:7etb9YClo3a6HjLzfl6rIQaU+FDfi0VSX39io3aQ+DM=
 github.com/prometheus/common v0.4.0/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/common v0.4.1/go.mod h1:TNfzLD0ON7rHzMJeJkieUDPYmFC7Snx/y86RQel1bk4=
+github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
+github.com/prometheus/common v0.26.0 h1:iMAkS2TDoNWnKM+Kopnx/8tnEStIfpYA0ur0xQzzhMQ=
+github.com/prometheus/common v0.26.0/go.mod h1:M7rCNAaPfAosfx8veZJCuw84e35h3Cfd9VFqTh1DIvc=
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
+github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084 h1:sofwID9zm4tzrgykg80hfFph1mryUeLRsUfoocVVmRY=
 github.com/prometheus/procfs v0.0.0-20190507164030-5867b95ac084/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
+github.com/prometheus/procfs v0.1.3/go.mod h1:lV6e/gmhEcM9IjHGsFOCxxuZ+z1YqCvr4OA4YeYWdaU=
+github.com/prometheus/procfs v0.6.0 h1:mxy4L2jP6qMonqmq+aTtOx1ifVWUgG/TAmntgbh3xv4=
+github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/tsdb v0.7.1/go.mod h1:qhTCs0VvXwvX/y3TZrWD7rabWM+ijKTux40TwIPHuXU=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=
 github.com/robfig/cron/v3 v3.0.1/go.mod h1:eQICP3HwyT7UooqI/z+Ov+PtYAWygg1TEWWzGIFLtro=
@@ -201,6 +255,8 @@ github.com/ryanuber/columnize v0.0.0-20160712163229-9b3edd62028f/go.mod h1:sm1tb
 github.com/sean-/seed v0.0.0-20170313163322-e2103e2c3529/go.mod h1:DxrIzT+xaE7yg65j358z/aeFdxmN0P9QXhEzd20vsDc=
 github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
+github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d h1:zE9ykElWQ6/NYmHa3jpm/yHnI4xSofP+UP6SpjHcSeM=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/goconvey v1.6.4 h1:fv0U8FUIMPNf1L9lnHLvLhgicrIVChEkdzIKYqbNC9s=
@@ -225,6 +281,8 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0 h1:Slr1R9HxAlEKefgq5jn9U+DnETlIUa6HfgEzj0g5d7s=
@@ -280,11 +338,14 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
+golang.org/x/net v0.0.0-20200625001655-4c5254603344/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20201021035429-f5854403a974/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
 golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb h1:eBmm0M9fYhWpKZLjQUUKka/LtIxf46G4fxeEz5KJr9U=
 golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb/go.mod h1:sp8m0HH+o8qH0wwXwYZr8TS3Oi6o0r6Gce1SSxlDquU=
+golang.org/x/net v0.0.0-20210428140749-89ef3d95e781/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -293,7 +354,9 @@ golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -305,6 +368,7 @@ golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5h
 golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190507160741-ecd444e8653b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190606165138-5da285871e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -313,15 +377,25 @@ golang.org/x/sys v0.0.0-20190904154756-749cb33beabd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20191005200804-aed5e4c7ecf9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091 h1:DMyOG0U+gKfu8JZzg2UQe9MeaC1X+xQWlAKcRnjxjCw=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 h1:SvFZT6jyqRaOeXpc5h/JSfZenJ2O330aBsf7JfSUXmQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@@ -384,6 +458,9 @@ google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.25.0 h1:Ejskq+SyPohKW+1uil0JJMtmHCgJPJ/qWTxr8qp+R4c=
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -398,10 +475,13 @@ gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkep
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

tools/metrics_exporter/main.go

@@ -0,0 +1,56 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/hibiken/asynq"
+	"github.com/hibiken/asynq/x/metrics"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+// Declare command-line flags.
+// These variables are binded to flags in init().
+var (
+	flagRedisAddr     string
+	flagRedisDB       int
+	flagRedisPassword string
+	flagRedisUsername string
+	flagPort          int
+)
+
+func init() {
+	flag.StringVar(&flagRedisAddr, "redis-addr", "127.0.0.1:6379", "host:port of redis server to connect to")
+	flag.IntVar(&flagRedisDB, "redis-db", 0, "redis DB number to use")
+	flag.StringVar(&flagRedisPassword, "redis-password", "", "password used to connect to redis server")
+	flag.StringVar(&flagRedisUsername, "redis-username", "", "username used to connect to redis server")
+	flag.IntVar(&flagPort, "port", 9876, "port to use for the HTTP server")
+}
+
+func main() {
+	flag.Parse()
+	// Using NewPedanticRegistry here to test the implementation of Collectors and Metrics.
+	reg := prometheus.NewPedanticRegistry()
+
+	inspector := asynq.NewInspector(asynq.RedisClientOpt{
+		Addr:     flagRedisAddr,
+		DB:       flagRedisDB,
+		Password: flagRedisPassword,
+		Username: flagRedisUsername,
+	})
+
+	reg.MustRegister(
+		metrics.NewQueueMetricsCollector(inspector),
+		// Add the standard process and go metrics to the registry
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+		collectors.NewGoCollector(),
+	)
+
+	http.Handle("/metrics", promhttp.HandlerFor(reg, promhttp.HandlerOpts{}))
+	log.Printf("exporter server is listening on port: %d\n", flagPort)
+	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%d", flagPort), nil))
+}

x/go.mod

@@ -0,0 +1,12 @@
+module github.com/hibiken/asynq/x
+
+go 1.16
+
+require (
+	github.com/go-redis/redis/v8 v8.11.4
+	github.com/google/uuid v1.3.0
+	github.com/hibiken/asynq v0.19.0
+	github.com/prometheus/client_golang v1.11.0
+)
+
+replace github.com/hibiken/asynq => ./..

x/go.sum

@@ -0,0 +1,256 @@
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x/metrics/metrics.go

@@ -0,0 +1,190 @@
+// Package metrics provides implementations of prometheus.Collector to collect Asynq queue metrics.
+package metrics
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/hibiken/asynq"
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+// Namespace used in fully-qualified metrics names.
+const namespace = "asynq"
+
+// QueueMetricsCollector gathers queue metrics.
+// It implements prometheus.Collector interface.
+//
+// All metrics exported from this collector have prefix "asynq".
+type QueueMetricsCollector struct {
+	inspector *asynq.Inspector
+}
+
+// collectQueueInfo gathers QueueInfo of all queues.
+// Since this operation is expensive, it must be called once per collection.
+func (qmc *QueueMetricsCollector) collectQueueInfo() ([]*asynq.QueueInfo, error) {
+	qnames, err := qmc.inspector.Queues()
+	if err != nil {
+		return nil, fmt.Errorf("failed to get queue names: %v", err)
+	}
+	infos := make([]*asynq.QueueInfo, len(qnames))
+	for i, qname := range qnames {
+		qinfo, err := qmc.inspector.GetQueueInfo(qname)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get queue info: %v", err)
+		}
+		infos[i] = qinfo
+	}
+	return infos, nil
+}
+
+// Descriptors used by QueueMetricsCollector
+var (
+	tasksQueuedDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_enqueued_total"),
+		"Number of tasks enqueued; broken down by queue and state.",
+		[]string{"queue", "state"}, nil,
+	)
+
+	queueSizeDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_size"),
+		"Number of tasks in a queue",
+		[]string{"queue"}, nil,
+	)
+
+	queueLatencyDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_latency_seconds"),
+		"Number of seconds the oldest pending task is waiting in pending state to be processed.",
+		[]string{"queue"}, nil,
+	)
+
+	queueMemUsgDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_memory_usage_approx_bytes"),
+		"Number of memory used by a given queue (approximated number by sampling).",
+		[]string{"queue"}, nil,
+	)
+
+	tasksProcessedTotalDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_processed_total"),
+		"Number of tasks processed (both succeeded and failed); broken down by queue",
+		[]string{"queue"}, nil,
+	)
+
+	tasksFailedTotalDesc = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "tasks_failed_total"),
+		"Number of tasks failed; broken down by queue",
+		[]string{"queue"}, nil,
+	)
+
+	pausedQueues = prometheus.NewDesc(
+		prometheus.BuildFQName(namespace, "", "queue_paused_total"),
+		"Number of queues paused",
+		[]string{"queue"}, nil,
+	)
+)
+
+func (qmc *QueueMetricsCollector) Describe(ch chan<- *prometheus.Desc) {
+	prometheus.DescribeByCollect(qmc, ch)
+}
+
+func (qmc *QueueMetricsCollector) Collect(ch chan<- prometheus.Metric) {
+	queueInfos, err := qmc.collectQueueInfo()
+	if err != nil {
+		log.Printf("Failed to collect metrics data: %v", err)
+	}
+	for _, info := range queueInfos {
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Active),
+			info.Queue,
+			"active",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Pending),
+			info.Queue,
+			"pending",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Scheduled),
+			info.Queue,
+			"scheduled",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Retry),
+			info.Queue,
+			"retry",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Archived),
+			info.Queue,
+			"archived",
+		)
+		ch <- prometheus.MustNewConstMetric(
+			tasksQueuedDesc,
+			prometheus.GaugeValue,
+			float64(info.Completed),
+			info.Queue,
+			"completed",
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueSizeDesc,
+			prometheus.GaugeValue,
+			float64(info.Size),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueLatencyDesc,
+			prometheus.GaugeValue,
+			info.Latency.Seconds(),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			queueMemUsgDesc,
+			prometheus.GaugeValue,
+			float64(info.MemoryUsage),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			tasksProcessedTotalDesc,
+			prometheus.CounterValue,
+			float64(info.ProcessedTotal),
+			info.Queue,
+		)
+
+		ch <- prometheus.MustNewConstMetric(
+			tasksFailedTotalDesc,
+			prometheus.CounterValue,
+			float64(info.FailedTotal),
+			info.Queue,
+		)
+
+		pausedValue := 0 // zero to indicate "not paused"
+		if info.Paused {
+			pausedValue = 1
+		}
+		ch <- prometheus.MustNewConstMetric(
+			pausedQueues,
+			prometheus.GaugeValue,
+			float64(pausedValue),
+			info.Queue,
+		)
+	}
+}
+
+// NewQueueMetricsCollector returns a collector that exports metrics about Asynq queues.
+func NewQueueMetricsCollector(inspector *asynq.Inspector) *QueueMetricsCollector {
+	return &QueueMetricsCollector{inspector: inspector}
+}