chore: redirect klog to slog

PR #6890 removed the final bits from go-kit/log in the operator code
base but forgot to redirect the klog logs to the new slog logger.
`ResourceReconciler` has a dependency on klog because it uses
`utilruntime.HandleError()` when it fails to sync a resource. As a
consequence, the operator didn't log reconciliation failures anymore.

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

cmd/operator/main.go

@@ -41,6 +41,7 @@ import (
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
 	k8sflag "k8s.io/component-base/cli/flag"
+	"k8s.io/klog/v2"
 	"k8s.io/utils/ptr"
 
 	"github.com/prometheus-operator/prometheus-operator/internal/goruntime"
@@ -198,10 +199,7 @@ func run(fs *flag.FlagSet) int {
 	if err != nil {
 		stdlog.Fatal(err)
 	}
-
-	if err != nil {
-		stdlog.Fatal(err)
-	}
+	klog.SetSlogLogger(logger)
 
 	if err := cfg.Gates.UpdateFeatureGates(*featureGates.Map); err != nil {
 		logger.Error("", "error", err)

go.mod

@@ -144,5 +144,4 @@ require (
 replace (
 	github.com/prometheus-operator/prometheus-operator/pkg/apis/monitoring => ./pkg/apis/monitoring
 	github.com/prometheus-operator/prometheus-operator/pkg/client => ./pkg/client
-	k8s.io/klog/v2 => github.com/simonpasquier/klog-gokit/v3 v3.5.0
 )

go.sum

@@ -377,8 +377,6 @@ github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFR
 github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
 github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
-github.com/simonpasquier/klog-gokit/v3 v3.5.0 h1:ewnk+ickph0hkQFgdI4pffKIbruAxxWcg0Fe/vQmLOM=
-github.com/simonpasquier/klog-gokit/v3 v3.5.0/go.mod h1:S9flvRzzpaYLYtXI2w8jf9R/IU/Cy14NrbvDUevNP1E=
 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=
@@ -754,6 +752,8 @@ k8s.io/client-go v0.31.0 h1:QqEJzNjbN2Yv1H79SsS+SWnXkBgVu4Pj3CJQgbx0gI8=
 k8s.io/client-go v0.31.0/go.mod h1:Y9wvC76g4fLjmU0BA+rV+h2cncoadjvjjkkIGoTLcGU=
 k8s.io/component-base v0.31.0 h1:/KIzGM5EvPNQcYgwq5NwoQBaOlVFrghoVGr8lG6vNRs=
 k8s.io/component-base v0.31.0/go.mod h1:TYVuzI1QmN4L5ItVdMSXKvH7/DtvIuas5/mm8YT3rTo=
+k8s.io/klog/v2 v2.130.1 h1:n9Xl7H1Xvksem4KFG4PYbdQCQxqc/tTUyrgXaOhHSzk=
+k8s.io/klog/v2 v2.130.1/go.mod h1:3Jpz1GvMt720eyJH1ckRHK1EDfpxISzJ7I9OYgaDtPE=
 k8s.io/kube-openapi v0.0.0-20240808142205-8e686545bdb8 h1:1Wof1cGQgA5pqgo8MxKPtf+qN6Sh/0JzznmeGPm1HnE=
 k8s.io/kube-openapi v0.0.0-20240808142205-8e686545bdb8/go.mod h1:Os6V6dZwLNii3vxFpxcNaTmH8LJJBkOTg1N0tOA0fvA=
 k8s.io/utils v0.0.0-20240711033017-18e509b52bc8 h1:pUdcCO1Lk/tbT5ztQWOBi5HBgbBP1J8+AsQnQCKsi8A=

internal/log/log.go

@@ -23,7 +23,6 @@ import (
 
 	"github.com/go-kit/log"
 	loglevel "github.com/go-kit/log/level"
-	klogv2 "k8s.io/klog/v2"
 )
 
 const (
@@ -59,14 +58,10 @@ func NewLogger(c Config) (log.Logger, error) {
 	)
 
 	// For log levels other than debug, the klog verbosity level is 0.
-	klogv2.ClampLevel(0)
 	switch strings.ToLower(c.Level) {
 	case LevelAll:
 		lvlOption = loglevel.AllowAll()
 	case LevelDebug:
-		// When the log level is set to debug, we set the klog verbosity level to 6.
-		// Above level 6, the k8s client would log bearer tokens in clear-text.
-		klogv2.ClampLevel(6)
 		lvlOption = loglevel.AllowDebug()
 	case LevelInfo:
 		lvlOption = loglevel.AllowInfo()
@@ -93,8 +88,6 @@ func NewLogger(c Config) (log.Logger, error) {
 	logger = log.With(logger, "ts", log.DefaultTimestampUTC)
 	logger = log.With(logger, "caller", log.DefaultCaller)
 
-	klogv2.SetLogger(log.With(logger, "component", "k8s_client_runtime"))
-
 	return logger, nil
 }