docs: add inline clarification on DISABLE_MEMORY_USAGE_PROFILING usage

Try disabling memory usage profiling

go.mod

@@ -1,6 +1,6 @@
 module github.com/hibiken/asynq
 
-go 1.25.0
+go 1.24.0
 
 require (
 	github.com/google/go-cmp v0.7.0
@@ -9,7 +9,7 @@ require (
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/spf13/cast v1.10.0
 	go.uber.org/goleak v1.3.0
-	golang.org/x/sys v0.45.0
+	golang.org/x/sys v0.37.0
 	golang.org/x/time v0.14.0
 	google.golang.org/protobuf v1.36.10
 )

go.sum

@@ -32,8 +32,8 @@ github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PK
 github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
 go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
-golang.org/x/sys v0.45.0 h1:dO4czNzziLiiXplLQgBCEpCvXQ3dnkn0SdaZSYdQ+FY=
-golang.org/x/sys v0.45.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 golang.org/x/time v0.14.0 h1:MRx4UaLrDotUKUdCIqzPC48t1Y9hANFKIRpNx+Te8PI=
 golang.org/x/time v0.14.0/go.mod h1:eL/Oa2bBBK0TkX57Fyni+NgnyQQN4LitPmob2Hjnqw4=
 google.golang.org/protobuf v1.36.10 h1:AYd7cD/uASjIL6Q9LiTjz8JLcrh/88q5UObnmY3aOOE=

internal/rdb/inspect.go

@@ -7,6 +7,7 @@ package rdb
 import (
 	"context"
 	"fmt"
+	"os"
 	"strings"
 	"time"
 
@@ -137,6 +138,8 @@ table.insert(res, aggregating_count)
 return res`)
 
 // CurrentStats returns a current state of the queues.
+// if DISABLE_MEMORY_USAGE_PROFILING is set to "true" or any non empty value, memory usage profiling will be disabled
+// which is otherwise always performed..
 func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 	var op errors.Op = "rdb.CurrentStats"
 	exists, err := r.queueExists(qname)
@@ -228,11 +231,15 @@ func (r *RDB) CurrentStats(qname string) (*Stats, error) {
 		}
 	}
 	stats.Size = size
-	memusg, err := r.memoryUsage(qname)
-	if err != nil {
-		return nil, errors.E(op, errors.CanonicalCode(err), err)
+	disableMemUsageProfiling := os.Getenv("DISABLE_MEMORY_USAGE_PROFILING")
+	if disableMemUsageProfiling == "false" || disableMemUsageProfiling == "" {
+		memusg, err := r.memoryUsage(qname)
+		if err != nil {
+			return nil, errors.E(op, errors.CanonicalCode(err), err)
+		}
+
+		stats.MemoryUsage = memusg
 	}
-	stats.MemoryUsage = memusg
 	return stats, nil
 }