chore: use Linux container CPU quota

Go is not cgroup aware and by default will set GOMAXPROCS to the number
of available threads, regardless of whether it is within the allocated
quota. This behaviour causes high amount of CPU throttling and degraded
application performance.

Fixes: VictoriaMetrics#875

go.mod

@@ -20,6 +20,7 @@ require (
 	github.com/prometheus/client_golang v1.18.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.8.4
+	go.uber.org/automaxprocs v1.5.3
 	go.uber.org/zap v1.21.0
 	golang.org/x/net v0.21.0
 	golang.org/x/sync v0.6.0

go.sum

@@ -167,6 +167,7 @@ github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINE
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 h1:Jamvg5psRIccs7FGNTlIRMkT8wgtp5eCXdBlqhYGL6U=
 github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/prashantv/gostub v1.1.0 h1:BTyx3RfQjRHnUWaGF9oQos79AlQ5k8WNktv7VGvVH4g=
 github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.62.0 h1:55138zTXw/yRYizPxZ672I/aDD7Yte3uYRAfUjWUu2M=
 github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring v0.62.0/go.mod h1:j51242bf6LQwvJ1JPKWApzTnifmCwcQq0i1p29ylWiM=
 github.com/prometheus-operator/prometheus-operator/pkg/client v0.62.0 h1:tNWmKX9k28He3KJA11G9ZOMi+r4skXpRTF77QYcFCpw=
@@ -223,6 +224,8 @@ go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqe
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/atomic v1.11.0 h1:ZvwS0R+56ePWxUNi+Atn9dWONBPp/AUETXlHW0DxSjE=
 go.uber.org/atomic v1.11.0/go.mod h1:LUxbIzbOniOlMKjJjyPfpl4v+PKK2cNJn91OQbhoJI0=
+go.uber.org/automaxprocs v1.5.3 h1:kWazyxZUrS3Gs4qUpbwo5kEIMGe/DAvi5Z4tl2NW4j8=
+go.uber.org/automaxprocs v1.5.3/go.mod h1:eRbA25aqJrxAbsLO0xy5jVwPt7FQnRgjW+efnwa1WM0=
 go.uber.org/goleak v1.1.10/go.mod h1:8a7PlsEVH3e/a/GLqe5IIrQx6GzcnRmZEufDUTk4A7A=
 go.uber.org/goleak v1.1.11/go.mod h1:cwTWslyiVhfpKIDGSZEM2HlOvcqm+tG4zioyIeLoqMQ=
 go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=

internal/config-reloader/main.go

@@ -22,6 +22,7 @@ import (
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
 	"github.com/VictoriaMetrics/VictoriaMetrics/lib/procutil"
 	"github.com/pires/go-proxyproto"
+	_ "go.uber.org/automaxprocs"
 )
 
 var (

main.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"os"
 
+	_ "go.uber.org/automaxprocs"
 	ctrl "sigs.k8s.io/controller-runtime"
 	"sigs.k8s.io/controller-runtime/pkg/manager/signals"