Merge pull request #2508 from mrueg/switch-to-slog

chore: Migrate to slog for exporter-toolkit

go.mod

@@ -6,13 +6,14 @@ require (
 	github.com/KimMachineGun/automemlimit v0.6.1
 	github.com/dgryski/go-jump v0.0.0-20211018200510-ba001c3ffce0
 	github.com/fsnotify/fsnotify v1.7.0
+	github.com/go-logr/logr v1.4.1
 	github.com/gobuffalo/flect v1.0.3
 	github.com/google/go-cmp v0.6.0
 	github.com/oklog/run v1.1.0
 	github.com/prometheus/client_golang v1.20.4
 	github.com/prometheus/client_model v0.6.1
 	github.com/prometheus/common v0.59.1
-	github.com/prometheus/exporter-toolkit v0.12.0
+	github.com/prometheus/exporter-toolkit v0.13.0
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/spf13/cobra v1.8.1
 	github.com/spf13/viper v1.19.0
@@ -38,9 +39,6 @@ require (
 	github.com/docker/go-units v0.4.0 // indirect
 	github.com/emicklei/go-restful/v3 v3.11.0 // indirect
 	github.com/evanphx/json-patch v5.6.0+incompatible // indirect
-	github.com/go-kit/log v0.2.1 // indirect
-	github.com/go-logfmt/logfmt v0.5.1 // indirect
-	github.com/go-logr/logr v1.4.1 // indirect
 	github.com/go-openapi/jsonpointer v0.19.6 // indirect
 	github.com/go-openapi/jsonreference v0.20.2 // indirect
 	github.com/go-openapi/swag v0.22.3 // indirect

go.sum

@@ -30,10 +30,6 @@ github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHk
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
-github.com/go-kit/log v0.2.1 h1:MRVx0/zhvdseW+Gza6N9rVzU/IVzaeE1SFI4raAhmBU=
-github.com/go-kit/log v0.2.1/go.mod h1:NwTd00d/i8cPZ3xOwwiv2PO5MOcx78fFErGNcVmBjv0=
-github.com/go-logfmt/logfmt v0.5.1 h1:otpy5pqBCBZ1ng9RQ0dPu4PN7ba75Y/aA+UpowDyNVA=
-github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/go-logr/logr v1.4.1 h1:pKouT5E8xu9zeFC39JXRDukb6JFQPXM5p5I91188VAQ=
 github.com/go-logr/logr v1.4.1/go.mod h1:9T104GzyrTigFIr8wt5mBrctHMim0Nb2HLGrmQ40KvY=
 github.com/go-openapi/jsonpointer v0.19.6 h1:eCs3fxoIi3Wh6vtgmLTOjdhSpiqphQ+DaPn38N2ZdrE=
@@ -131,8 +127,8 @@ github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p
 github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
 github.com/prometheus/common v0.59.1 h1:LXb1quJHWm1P6wq/U824uxYi4Sg0oGvNeUm1z5dJoX0=
 github.com/prometheus/common v0.59.1/go.mod h1:GpWM7dewqmVYcd7SmRaiWVe9SSqjf0UrwnYnpEZNuT0=
-github.com/prometheus/exporter-toolkit v0.12.0 h1:DkE5RcEZR3lQA2QD5JLVQIf41dFKNsVMXFhgqcif7fo=
-github.com/prometheus/exporter-toolkit v0.12.0/go.mod h1:fQH0KtTn0yrrS0S82kqppRjDDiwMfIQUwT+RBRRhwUc=
+github.com/prometheus/exporter-toolkit v0.13.0 h1:lmA0Q+8IaXgmFRKw09RldZmZdnvu9wwcDLIXGmTPw1c=
+github.com/prometheus/exporter-toolkit v0.13.0/go.mod h1:2uop99EZl80KdXhv/MxVI2181fMcwlsumFOqBecGkG0=
 github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
 github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/robfig/cron/v3 v3.0.1 h1:WdRxkvbJztn8LMz/QEvLN5sBU+xKpSqwwUO1Pjr4qDs=

pkg/app/server.go

@@ -21,6 +21,7 @@ import (
 	"crypto/md5" //nolint:gosec
 	"encoding/binary"
 	"fmt"
+	"log/slog"
 	"net"
 	"net/http"
 	"net/http/pprof"
@@ -30,6 +31,8 @@ import (
 	"strings"
 	"time"
 
+	"github.com/go-logr/logr"
+
 	"gopkg.in/yaml.v3"
 	"k8s.io/client-go/kubernetes"
 	_ "k8s.io/client-go/plugin/pkg/client/auth" // Initialize common client auth plugins.
@@ -66,19 +69,6 @@ const (
 	readyzPath  = "/readyz"
 )
 
-// promLogger implements promhttp.Logger
-type promLogger struct{}
-
-func (pl promLogger) Println(v ...interface{}) {
-	klog.Error(v...)
-}
-
-// promLogger implements the Logger interface
-func (pl promLogger) Log(v ...interface{}) error {
-	klog.Info(v...)
-	return nil
-}
-
 // RunKubeStateMetricsWrapper runs KSM with context cancellation.
 func RunKubeStateMetricsWrapper(ctx context.Context, opts *options.Options) error {
 	err := RunKubeStateMetrics(ctx, opts)
@@ -93,7 +83,6 @@ func RunKubeStateMetricsWrapper(ctx context.Context, opts *options.Options) erro
 // Any out-of-tree custom resource metrics could be registered by newing a registry factory
 // which implements customresource.RegistryFactory and pass all factories into this function.
 func RunKubeStateMetrics(ctx context.Context, opts *options.Options) error {
-	promLogger := promLogger{}
 	ksmMetricsRegistry := prometheus.NewRegistry()
 	ksmMetricsRegistry.MustRegister(versionCollector.NewCollector("kube_state_metrics"))
 	durationVec := promauto.With(ksmMetricsRegistry).NewHistogramVec(
@@ -361,11 +350,14 @@ func RunKubeStateMetrics(ctx context.Context, opts *options.Options) error {
 		WebConfigFile:      &tlsConfig,
 	}
 
+	handler := logr.ToSlogHandler(klog.Background())
+	sLogger := slog.New(handler)
+
 	// Run Telemetry server
 	{
 		g.Add(func() error {
 			klog.InfoS("Started kube-state-metrics self metrics server", "telemetryAddress", telemetryListenAddress)
-			return web.ListenAndServe(&telemetryServer, &telemetryFlags, promLogger)
+			return web.ListenAndServe(&telemetryServer, &telemetryFlags, sLogger)
 		}, func(error) {
 			ctxShutDown, cancel := context.WithTimeout(ctx, 3*time.Second)
 			defer cancel()
@@ -376,7 +368,7 @@ func RunKubeStateMetrics(ctx context.Context, opts *options.Options) error {
 	{
 		g.Add(func() error {
 			klog.InfoS("Started metrics server", "metricsServerAddress", metricsServerListenAddress)
-			return web.ListenAndServe(&metricsServer, &metricsFlags, promLogger)
+			return web.ListenAndServe(&metricsServer, &metricsFlags, sLogger)
 		}, func(error) {
 			ctxShutDown, cancel := context.WithTimeout(ctx, 3*time.Second)
 			defer cancel()
@@ -395,8 +387,11 @@ func RunKubeStateMetrics(ctx context.Context, opts *options.Options) error {
 func buildTelemetryServer(registry prometheus.Gatherer) *http.ServeMux {
 	mux := http.NewServeMux()
 
+	handler := logr.ToSlogHandler(klog.Background())
+	sLogger := slog.NewLogLogger(handler, slog.LevelError)
+
 	// Add metricsPath
-	mux.Handle(metricsPath, promhttp.HandlerFor(registry, promhttp.HandlerOpts{ErrorLog: promLogger{}}))
+	mux.Handle(metricsPath, promhttp.HandlerFor(registry, promhttp.HandlerOpts{ErrorLog: sLogger}))
 
 	// Add readyzPath
 	mux.Handle(readyzPath, http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {