fix: ensure consistent JSON log format for automaxprocs (#6335)

* fix: ensure consistent JSON log format for automaxprocs

Signed-off-by: Omer Aplatony <omerap12@gmail.com>

* moved to Unreleased

Signed-off-by: Omer Aplatony <omerap12@gmail.com>

---------

Signed-off-by: Omer Aplatony <omerap12@gmail.com>

CHANGELOG.md

@@ -72,6 +72,7 @@ Here is an overview of all new **experimental** features:
 
 ### Fixes
 
+- **General**: Centralize and improve automaxprocs configuration with proper structured logging ([#5970](https://github.com/kedacore/keda/issues/5970))
 - **General**: Paused ScaledObject count is reported correctly after operator restart ([#6321](https://github.com/kedacore/keda/issues/6321))
 
 ### Deprecations

cmd/adapter/main.go

@@ -26,7 +26,6 @@ import (
 	grpcprom "github.com/grpc-ecosystem/go-grpc-middleware/providers/prometheus"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
-	_ "go.uber.org/automaxprocs"
 	appsv1 "k8s.io/api/apps/v1"
 	apimetrics "k8s.io/apiserver/pkg/endpoints/metrics"
 	"k8s.io/client-go/kubernetes/scheme"
@@ -257,6 +256,12 @@ func main() {
 		return
 	}
 
+	err = kedautil.ConfigureMaxProcs(logger)
+	if err != nil {
+		logger.Error(err, "failed to set max procs")
+		return
+	}
+
 	kedaProvider, err := cmd.makeProvider(ctx)
 	if err != nil {
 		logger.Error(err, "making provider")

cmd/operator/main.go

@@ -22,7 +22,6 @@ import (
 	"time"
 
 	"github.com/spf13/pflag"
-	_ "go.uber.org/automaxprocs"
 	apimachineryruntime "k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	kubeinformers "k8s.io/client-go/informers"
@@ -115,6 +114,13 @@ func main() {
 
 	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
 	ctx := ctrl.SetupSignalHandler()
+
+	err := kedautil.ConfigureMaxProcs(setupLog)
+	if err != nil {
+		setupLog.Error(err, "failed to set max procs")
+		os.Exit(1)
+	}
+
 	namespaces, err := kedautil.GetWatchNamespaces()
 	if err != nil {
 		setupLog.Error(err, "failed to get watch namespace")

cmd/webhooks/main.go

@@ -22,7 +22,6 @@ import (
 	"os"
 
 	"github.com/spf13/pflag"
-	_ "go.uber.org/automaxprocs"
 	apimachineryruntime "k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
 	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
@@ -80,6 +79,12 @@ func main() {
 
 	ctrl.SetLogger(zap.New(zap.UseFlagOptions(&opts)))
 
+	err := kedautil.ConfigureMaxProcs(setupLog)
+	if err != nil {
+		setupLog.Error(err, "failed to set max procs")
+		os.Exit(1)
+	}
+
 	ctx := ctrl.SetupSignalHandler()
 
 	cfg := ctrl.GetConfigOrDie()

pkg/util/maxprocs.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2024 The KEDA Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"fmt"
+
+	"go.uber.org/automaxprocs/maxprocs"
+	"k8s.io/klog/v2"
+)
+
+// ConfigureMaxProcs sets up automaxprocs with proper logging configuration.
+// It wraps the automaxprocs logger to handle structured logging with string keys
+// to prevent panics when automaxprocs tries to pass numeric keys.
+func ConfigureMaxProcs(logger klog.Logger) error {
+	_, err := maxprocs.Set(maxprocs.Logger(func(format string, args ...interface{}) {
+		logger.Info(fmt.Sprintf(format, args...))
+	}))
+	return err
+}