Merge pull request #586 from prometheus/superq/slog

Update exporter-toolkit

.circleci/config.yml

@@ -5,7 +5,7 @@ executors:
   # Whenever the Go version is updated here, .promu.yml should also be updated.
   golang:
     docker:
-      - image: cimg/go:1.22
+      - image: cimg/go:1.23
 jobs:
   test:
     executor: golang

.promu.yml

@@ -1,7 +1,7 @@
 go:
     # Whenever the Go version is updated here, .circle/config.yml should also
     # be updated.
-    version: 1.22
+    version: 1.23
 repository:
     path: github.com/prometheus/statsd_exporter
 build:

bridge_test.go

@@ -15,14 +15,15 @@ package main
 
 import (
 	"fmt"
+	"log/slog"
 	"net"
 	"reflect"
 	"testing"
 	"time"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/clock"
 	"github.com/prometheus/statsd_exporter/pkg/event"
@@ -592,7 +593,7 @@ func TestHandlePacket(t *testing.T) {
 	for k, l := range []statsDPacketHandler{&listener.StatsDUDPListener{
 		Conn:            nil,
 		EventHandler:    nil,
-		Logger:          log.NewNopLogger(),
+		Logger:          promslog.NewNopLogger(),
 		LineParser:      parser,
 		UDPPackets:      udpPackets,
 		UDPPacketDrops:  udpPacketDrops,
@@ -605,7 +606,7 @@ func TestHandlePacket(t *testing.T) {
 	}, &mockStatsDTCPListener{listener.StatsDTCPListener{
 		Conn:            nil,
 		EventHandler:    nil,
-		Logger:          log.NewNopLogger(),
+		Logger:          promslog.NewNopLogger(),
 		LineParser:      parser,
 		LinesReceived:   linesReceived,
 		EventsFlushed:   eventsFlushed,
@@ -616,7 +617,7 @@ func TestHandlePacket(t *testing.T) {
 		TCPConnections:  tcpConnections,
 		TCPErrors:       tcpErrors,
 		TCPLineTooLong:  tcpLineTooLong,
-	}, log.NewNopLogger()}} {
+	}, promslog.NewNopLogger()}} {
 		events := make(chan event.Events, 32)
 		l.SetEventHandler(&event.UnbufferedEventHandler{C: events})
 		for i, scenario := range scenarios {
@@ -649,7 +650,7 @@ type statsDPacketHandler interface {
 
 type mockStatsDTCPListener struct {
 	listener.StatsDTCPListener
-	log.Logger
+	*slog.Logger
 }
 
 func (ml *mockStatsDTCPListener) HandlePacket(packet []byte) {
@@ -710,7 +711,7 @@ mappings:
 	events := make(chan event.Events)
 	defer close(events)
 	go func() {
-		ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 

exporter_benchmark_test.go

@@ -17,9 +17,8 @@ import (
 	"fmt"
 	"testing"
 
-	"github.com/go-kit/log"
-
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/event"
 	"github.com/prometheus/statsd_exporter/pkg/exporter"
@@ -43,7 +42,7 @@ func benchmarkUDPListener(times int, b *testing.B) {
 		"some_very_useful_metrics_with_quite_a_log_name:13|c",
 	}
 	bytesInput := make([]string, len(input)*times)
-	logger := log.NewNopLogger()
+	logger := promslog.NewNopLogger()
 	for run := 0; run < times; run++ {
 		for i := 0; i < len(input); i++ {
 			bytesInput[run*len(input)+i] = fmt.Sprintf("run%d%s", run, input[i])
@@ -175,7 +174,7 @@ mappings:
 		b.Fatalf("Config load error: %s %s", config, err)
 	}
 
-	ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := exporter.NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 
 	// reset benchmark timer to not measure startup costs
 	b.ResetTimer()

go.mod

@@ -1,15 +1,14 @@
 module github.com/prometheus/statsd_exporter
 
-go 1.21
+go 1.22
 
 require (
 	github.com/alecthomas/kingpin/v2 v2.4.0
-	github.com/go-kit/log v0.2.1
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
-	github.com/prometheus/client_golang v1.20.3
+	github.com/prometheus/client_golang v1.20.4
 	github.com/prometheus/client_model v0.6.1
-	github.com/prometheus/common v0.57.0
+	github.com/prometheus/common v0.60.0
-	github.com/prometheus/exporter-toolkit v0.11.0
+	github.com/prometheus/exporter-toolkit v0.13.0
 	github.com/stvp/go-udp-testing v0.0.0-20201019212854-469649b16807
 	gopkg.in/yaml.v2 v2.4.0
 )
@@ -19,18 +18,19 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/coreos/go-systemd/v22 v22.5.0 // indirect
-	github.com/go-logfmt/logfmt v0.6.0 // indirect
 	github.com/jpillora/backoff v1.0.0 // indirect
 	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/mdlayher/socket v0.4.1 // indirect
+	github.com/mdlayher/vsock v1.2.1 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f // indirect
 	github.com/prometheus/procfs v0.15.1 // indirect
 	github.com/xhit/go-str2duration/v2 v2.1.0 // indirect
-	golang.org/x/crypto v0.26.0 // indirect
+	golang.org/x/crypto v0.27.0 // indirect
-	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
-	golang.org/x/oauth2 v0.22.0 // indirect
+	golang.org/x/oauth2 v0.23.0 // indirect
 	golang.org/x/sync v0.8.0 // indirect
-	golang.org/x/sys v0.24.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
-	golang.org/x/text v0.17.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 )

go.sum

@@ -11,10 +11,6 @@ github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSV
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-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 v0.6.0 h1:wGYYu3uicYdqXVgoYbvnkrPVXkuLM1p1ifugDMEdRi4=
-github.com/go-logfmt/logfmt v0.6.0/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
 github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
@@ -30,20 +26,24 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
+github.com/mdlayher/socket v0.4.1 h1:eM9y2/jlbs1M615oshPQOHZzj6R6wMT7bX5NPiQvn2U=
+github.com/mdlayher/socket v0.4.1/go.mod h1:cAqeGjoufqdxWkD7DkpyS+wcefOtmu5OQ8KuoJGIReA=
+github.com/mdlayher/vsock v1.2.1 h1:pC1mTJTvjo1r9n9fbm7S1j04rCgCzhCOS5DY0zqHlnQ=
+github.com/mdlayher/vsock v1.2.1/go.mod h1:NRfCibel++DgeMD8z/hP+PPTjlNJsdPOmxcnENvE+SE=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f h1:KUppIJq7/+SVif2QVs3tOP0zanoHgBEVAwHxUSIzRqU=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_golang v1.20.3 h1:oPksm4K8B+Vt35tUhw6GbSNSgVlVSBH0qELP/7u83l4=
+github.com/prometheus/client_golang v1.20.4 h1:Tgh3Yr67PaOv/uTqloMsCEdeuFTatm5zIq5+qNN23vI=
-github.com/prometheus/client_golang v1.20.3/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
+github.com/prometheus/client_golang v1.20.4/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
 github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
-github.com/prometheus/common v0.57.0 h1:Ro/rKjwdq9mZn1K5QPctzh+MA4Lp0BuYk5ZZEVhoNcY=
+github.com/prometheus/common v0.60.0 h1:+V9PAREWNvJMAuJ1x1BaWl9dewMW4YrHZQbx0sJNllA=
-github.com/prometheus/common v0.57.0/go.mod h1:7uRPFSUTbfZWsJ7MHY56sqt7hLQu3bxXHDnNhl8E9qI=
+github.com/prometheus/common v0.60.0/go.mod h1:h0LYf1R1deLSKtD4Vdg8gy4RuOvENW2J/h19V5NADQw=
-github.com/prometheus/exporter-toolkit v0.11.0 h1:yNTsuZ0aNCNFQ3aFTD2uhPOvr4iD7fdBvKPAEGkNf+g=
+github.com/prometheus/exporter-toolkit v0.13.0 h1:lmA0Q+8IaXgmFRKw09RldZmZdnvu9wwcDLIXGmTPw1c=
-github.com/prometheus/exporter-toolkit v0.11.0/go.mod h1:BVnENhnNecpwoTLiABx7mrPB/OLRIgN74qlQbV+FK1Q=
+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/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
@@ -61,18 +61,18 @@ github.com/stvp/go-udp-testing v0.0.0-20201019212854-469649b16807 h1:LUsDduamluc
 github.com/stvp/go-udp-testing v0.0.0-20201019212854-469649b16807/go.mod h1:7jxmlfBCDBXRzr0eAQJ48XC1hBu1np4CS5+cHEYfwpc=
 github.com/xhit/go-str2duration/v2 v2.1.0 h1:lxklc02Drh6ynqX+DdPyp5pCKLUQpRT8bp8Ydu2Bstc=
 github.com/xhit/go-str2duration/v2 v2.1.0/go.mod h1:ohY8p+0f07DiV6Em5LKB0s2YpLtXVyJfNt1+BlmyAsU=
-golang.org/x/crypto v0.26.0 h1:RrRspgV4mU+YwB4FYnuBoKsUapNIL5cohGAmSH3azsw=
+golang.org/x/crypto v0.27.0 h1:GXm2NjJrPaiv/h1tb2UH8QfgC/hOf/+z0p6PT8o1w7A=
-golang.org/x/crypto v0.26.0/go.mod h1:GY7jblb9wI+FOo5y8/S2oY4zWP07AkOJ4+jxCqdqn54=
+golang.org/x/crypto v0.27.0/go.mod h1:1Xngt8kV6Dvbssa53Ziq6Eqn0HqbZi5Z6R0ZpwQzt70=
-golang.org/x/net v0.28.0 h1:a9JDOJc5GMUJ0+UDqmLT86WiEy7iWyIhz8gz8E4e5hE=
+golang.org/x/net v0.29.0 h1:5ORfpBpCs4HzDYoodCDBbwHzdR5UrLBZ3sOnUJmFoHo=
-golang.org/x/net v0.28.0/go.mod h1:yqtgsTWOOnlGLG9GFRrK3++bGOUEkNBoHZc8MEDWPNg=
+golang.org/x/net v0.29.0/go.mod h1:gLkgy8jTGERgjzMic6DS9+SP0ajcu6Xu3Orq/SpETg0=
-golang.org/x/oauth2 v0.22.0 h1:BzDx2FehcG7jJwgWLELCdmLuxk2i+x9UDpSiss2u0ZA=
+golang.org/x/oauth2 v0.23.0 h1:PbgcYx2W7i4LvjJWEbf0ngHV6qJYr86PkAV3bXdLEbs=
-golang.org/x/oauth2 v0.22.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
+golang.org/x/oauth2 v0.23.0/go.mod h1:XYTD2NtWslqkgxebSiOHnXEap4TF09sJSc7H1sXbhtI=
 golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
 golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.24.0 h1:Twjiwq9dn6R1fQcyiK+wQyHWfaz/BJB+YIpzU/Cv3Xg=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
-golang.org/x/sys v0.24.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.17.0 h1:XtiM5bkSOt+ewxlOE/aE/AKEHibwj/6gvWMl9Rsh0Qc=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
-golang.org/x/text v0.17.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
+golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
 google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
 google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

line_benchmark_test.go

@@ -16,7 +16,7 @@ package main
 import (
 	"testing"
 
-	"github.com/go-kit/log"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/line"
 )
@@ -36,7 +36,7 @@ var (
 		"foo15:200|ms:300|ms:5|c|@0.1:6|g\nfoo15a:1|c:5|ms",
 		"some_very_useful_metrics_with_quite_a_log_name:13|c",
 	}
-	nopLogger = log.NewNopLogger()
+	nopLogger = promslog.NewNopLogger()
 )
 
 func benchmarkLinesToEvents(times int, b *testing.B, input []string) {

main.go

@@ -16,6 +16,7 @@ package main
 import (
 	"bufio"
 	"fmt"
+	"log/slog"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
@@ -25,20 +26,18 @@ import (
 	"syscall"
 
 	"github.com/alecthomas/kingpin/v2"
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	versioncollector "github.com/prometheus/client_golang/prometheus/collectors/version"
 	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"github.com/prometheus/common/promlog"
+	"github.com/prometheus/common/promslog"
-	"github.com/prometheus/common/promlog/flag"
+	"github.com/prometheus/common/promslog/flag"
 	"github.com/prometheus/common/version"
 	"github.com/prometheus/exporter-toolkit/web"
 
 	"github.com/prometheus/statsd_exporter/pkg/address"
 	"github.com/prometheus/statsd_exporter/pkg/event"
 	"github.com/prometheus/statsd_exporter/pkg/exporter"
-	"github.com/prometheus/statsd_exporter/pkg/level"
 	"github.com/prometheus/statsd_exporter/pkg/line"
 	"github.com/prometheus/statsd_exporter/pkg/listener"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
@@ -174,49 +173,49 @@ var (
 	)
 )
 
-func serveHTTP(mux http.Handler, listenAddress string, logger log.Logger) {
+func serveHTTP(mux http.Handler, listenAddress string, logger *slog.Logger) {
-	level.Error(logger).Log("msg", http.ListenAndServe(listenAddress, mux))
+	logger.Error(http.ListenAndServe(listenAddress, mux).Error())
 	os.Exit(1)
 }
 
-func sighupConfigReloader(fileName string, mapper *mapper.MetricMapper, logger log.Logger) {
+func sighupConfigReloader(fileName string, mapper *mapper.MetricMapper, logger *slog.Logger) {
 	signals := make(chan os.Signal, 1)
 	signal.Notify(signals, syscall.SIGHUP)
 
 	for s := range signals {
 		if fileName == "" {
-			level.Warn(logger).Log("msg", "Received signal but no mapping config to reload", "signal", s)
+			logger.Warn("Received signal but no mapping config to reload", "signal", s)
 			continue
 		}
 
-		level.Info(logger).Log("msg", "Received signal, attempting reload", "signal", s)
+		logger.Info("Received signal, attempting reload", "signal", s)
 
 		reloadConfig(fileName, mapper, logger)
 	}
 }
 
-func reloadConfig(fileName string, mapper *mapper.MetricMapper, logger log.Logger) {
+func reloadConfig(fileName string, mapper *mapper.MetricMapper, logger *slog.Logger) {
 	err := mapper.InitFromFile(fileName)
 	if err != nil {
-		level.Info(logger).Log("msg", "Error reloading config", "error", err)
+		logger.Info("Error reloading config", "error", err)
 		configLoads.WithLabelValues("failure").Inc()
 	} else {
-		level.Info(logger).Log("msg", "Config reloaded successfully")
+		logger.Info("Config reloaded successfully")
 		configLoads.WithLabelValues("success").Inc()
 	}
 }
 
-func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger log.Logger) error {
+func dumpFSM(mapper *mapper.MetricMapper, dumpFilename string, logger *slog.Logger) error {
 	f, err := os.Create(dumpFilename)
 	if err != nil {
 		return err
 	}
-	level.Info(logger).Log("msg", "Start dumping FSM", "file_name", dumpFilename)
+	logger.Info("Start dumping FSM", "file_name", dumpFilename)
 	w := bufio.NewWriter(f)
 	mapper.FSM.DumpFSM(w)
 	w.Flush()
 	f.Close()
-	level.Info(logger).Log("msg", "Finish dumping FSM")
+	logger.Info("Finish dumping FSM")
 	return nil
 }
 
@@ -271,17 +270,13 @@ func main() {
 		udpPacketQueueSize   = kingpin.Flag("statsd.udp-packet-queue-size", "Size of internal queue for processing UDP packets.").Default("10000").Int()
 	)
 
-	promlogConfig := &promlog.Config{}
+	promslogConfig := &promslog.Config{}
-	flag.AddFlags(kingpin.CommandLine, promlogConfig)
+	flag.AddFlags(kingpin.CommandLine, promslogConfig)
 	kingpin.Version(version.Print("statsd_exporter"))
 	kingpin.CommandLine.UsageWriter(os.Stdout)
 	kingpin.HelpFlag.Short('h')
 	kingpin.Parse()
-	logger := promlog.New(promlogConfig)
+	logger := promslog.New(promslogConfig)
-	if err := level.SetLogLevel(promlogConfig.Level.String()); err != nil {
-		level.Error(logger).Log("msg", "failed to set log level", "error", err)
-		os.Exit(1)
-	}
 	prometheus.MustRegister(versioncollector.NewCollector("statsd_exporter"))
 
 	parser := line.NewParser()
@@ -298,8 +293,8 @@ func main() {
 		parser.EnableSignalFXParsing()
 	}
 
-	level.Info(logger).Log("msg", "Starting StatsD -> Prometheus Exporter", "version", version.Info())
+	logger.Info("Starting StatsD -> Prometheus Exporter", "version", version.Info())
-	level.Info(logger).Log("msg", "Build context", "context", version.BuildContext())
+	logger.Info("Build context", "context", version.BuildContext())
 
 	events := make(chan event.Events, *eventQueueSize)
 	defer close(events)
@@ -309,7 +304,7 @@ func main() {
 
 	cache, err := getCache(*cacheSize, *cacheType, thisMapper.Registerer)
 	if err != nil {
-		level.Error(logger).Log("msg", "Unable to setup metric mapper cache", "error", err)
+		logger.Error("Unable to setup metric mapper cache", "error", err)
 		os.Exit(1)
 	}
 	thisMapper.UseCache(cache)
@@ -317,13 +312,13 @@ func main() {
 	if *mappingConfig != "" {
 		err := thisMapper.InitFromFile(*mappingConfig)
 		if err != nil {
-			level.Error(logger).Log("msg", "error loading config", "error", err)
+			logger.Error("error loading config", "error", err)
 			os.Exit(1)
 		}
 		if *dumpFSMPath != "" {
 			err := dumpFSM(thisMapper, *dumpFSMPath, logger)
 			if err != nil {
-				level.Error(logger).Log("msg", "error dumping FSM", "error", err)
+				logger.Error("error dumping FSM", "error", err)
 				// Failure to dump the FSM is an error (the user asked for it and it
 				// didn't happen) but not fatal (the exporter is fully functional
 				// afterwards).
@@ -334,7 +329,7 @@ func main() {
 	exporter := exporter.NewExporter(prometheus.DefaultRegisterer, thisMapper, logger, eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 
 	if *checkConfig {
-		level.Info(logger).Log("msg", "Configuration check successful, exiting")
+		logger.Info("Configuration check successful, exiting")
 		return
 	}
 
@@ -343,35 +338,35 @@ func main() {
 		var err error
 		relayTarget, err = relay.NewRelay(logger, *relayAddr, *relayPacketLen)
 		if err != nil {
-			level.Error(logger).Log("msg", "Unable to create relay", "err", err)
+			logger.Error("Unable to create relay", "err", err)
 			os.Exit(1)
 		}
 	}
 
-	level.Info(logger).Log("msg", "Accepting StatsD Traffic", "udp", *statsdListenUDP, "tcp", *statsdListenTCP, "unixgram", *statsdListenUnixgram)
+	logger.Info("Accepting StatsD Traffic", "udp", *statsdListenUDP, "tcp", *statsdListenTCP, "unixgram", *statsdListenUnixgram)
-	level.Info(logger).Log("msg", "Accepting Prometheus Requests", "addr", *listenAddress)
+	logger.Info("Accepting Prometheus Requests", "addr", *listenAddress)
 
 	if *statsdListenUDP == "" && *statsdListenTCP == "" && *statsdListenUnixgram == "" {
-		level.Error(logger).Log("At least one of UDP/TCP/Unixgram listeners must be specified.")
+		logger.Error("At least one of UDP/TCP/Unixgram listeners must be specified.")
 		os.Exit(1)
 	}
 
 	if *statsdListenUDP != "" {
 		udpListenAddr, err := address.UDPAddrFromString(*statsdListenUDP)
 		if err != nil {
-			level.Error(logger).Log("msg", "invalid UDP listen address", "address", *statsdListenUDP, "error", err)
+			logger.Error("invalid UDP listen address", "address", *statsdListenUDP, "error", err)
 			os.Exit(1)
 		}
 		uconn, err := net.ListenUDP("udp", udpListenAddr)
 		if err != nil {
-			level.Error(logger).Log("msg", "failed to start UDP listener", "error", err)
+			logger.Error("failed to start UDP listener", "error", err)
 			os.Exit(1)
 		}
 
 		if *readBuffer != 0 {
 			err = uconn.SetReadBuffer(*readBuffer)
 			if err != nil {
-				level.Error(logger).Log("msg", "error setting UDP read buffer", "error", err)
+				logger.Error("error setting UDP read buffer", "error", err)
 				os.Exit(1)
 			}
 		}
@@ -401,12 +396,12 @@ func main() {
 	if *statsdListenTCP != "" {
 		tcpListenAddr, err := address.TCPAddrFromString(*statsdListenTCP)
 		if err != nil {
-			level.Error(logger).Log("msg", "invalid TCP listen address", "address", *statsdListenUDP, "error", err)
+			logger.Error("invalid TCP listen address", "address", *statsdListenUDP, "error", err)
 			os.Exit(1)
 		}
 		tconn, err := net.ListenTCP("tcp", tcpListenAddr)
 		if err != nil {
-			level.Error(logger).Log("msg", err)
+			logger.Error("failed to start TCP listener", "err", err)
 			os.Exit(1)
 		}
 		defer tconn.Close()
@@ -434,7 +429,7 @@ func main() {
 	if *statsdListenUnixgram != "" {
 		var err error
 		if _, err = os.Stat(*statsdListenUnixgram); !os.IsNotExist(err) {
-			level.Error(logger).Log("msg", "Unixgram socket already exists", "socket_name", *statsdListenUnixgram)
+			logger.Error("Unixgram socket already exists", "socket_name", *statsdListenUnixgram)
 			os.Exit(1)
 		}
 		uxgconn, err := net.ListenUnixgram("unixgram", &net.UnixAddr{
@@ -442,7 +437,7 @@ func main() {
 			Name: *statsdListenUnixgram,
 		})
 		if err != nil {
-			level.Error(logger).Log("msg", "failed to listen on Unixgram socket", "error", err)
+			logger.Error("failed to listen on Unixgram socket", "error", err)
 			os.Exit(1)
 		}
 
@@ -451,7 +446,7 @@ func main() {
 		if *readBuffer != 0 {
 			err = uxgconn.SetReadBuffer(*readBuffer)
 			if err != nil {
-				level.Error(logger).Log("msg", "error setting Unixgram read buffer", "error", err)
+				logger.Error("error setting Unixgram read buffer", "error", err)
 				os.Exit(1)
 			}
 		}
@@ -481,11 +476,11 @@ func main() {
 			// convert the string to octet
 			perm, err := strconv.ParseInt("0"+string(*statsdUnixSocketMode), 8, 32)
 			if err != nil {
-				level.Warn(logger).Log("Bad permission %s: %v, ignoring\n", *statsdUnixSocketMode, err)
+				logger.Warn("Bad permission %s: %v, ignoring\n", *statsdUnixSocketMode, err)
 			} else {
 				err = os.Chmod(*statsdListenUnixgram, os.FileMode(perm))
 				if err != nil {
-					level.Warn(logger).Log("Failed to change unixgram socket permission: %v", err)
+					logger.Warn("Failed to change unixgram socket permission", "error", err)
 				}
 			}
 		}
@@ -507,7 +502,7 @@ func main() {
 		}
 		landingPage, err := web.NewLandingPage(landingConfig)
 		if err != nil {
-			level.Error(logger).Log("err", err)
+			logger.Error("error creating landing page", "err", err)
 			os.Exit(1)
 		}
 		mux.Handle("/", landingPage)
@@ -520,10 +515,10 @@ func main() {
 			if r.Method == http.MethodPut || r.Method == http.MethodPost {
 				fmt.Fprintf(w, "Requesting reload")
 				if *mappingConfig == "" {
-					level.Warn(logger).Log("msg", "Received lifecycle api reload but no mapping config to reload")
+					logger.Warn("Received lifecycle api reload but no mapping config to reload")
 					return
 				}
-				level.Info(logger).Log("msg", "Received lifecycle api reload, attempting reload")
+				logger.Info("Received lifecycle api reload, attempting reload")
 				reloadConfig(*mappingConfig, thisMapper, logger)
 			}
 		})
@@ -537,7 +532,7 @@ func main() {
 
 	mux.HandleFunc("/-/healthy", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method == http.MethodGet {
-			level.Debug(logger).Log("msg", "Received health check")
+			logger.Debug("Received health check")
 			w.WriteHeader(http.StatusOK)
 			fmt.Fprintf(w, "Statsd Exporter is Healthy.\n")
 		}
@@ -545,7 +540,7 @@ func main() {
 
 	mux.HandleFunc("/-/ready", func(w http.ResponseWriter, r *http.Request) {
 		if r.Method == http.MethodGet {
-			level.Debug(logger).Log("msg", "Received ready check")
+			logger.Debug("Received ready check")
 			w.WriteHeader(http.StatusOK)
 			fmt.Fprintf(w, "Statsd Exporter is Ready.\n")
 		}
@@ -562,8 +557,8 @@ func main() {
 	// quit if we get a message on either channel
 	select {
 	case sig := <-signals:
-		level.Info(logger).Log("msg", "Received os signal, exiting", "signal", sig.String())
+		logger.Info("Received os signal, exiting", "signal", sig.String())
 	case <-quitChan:
-		level.Info(logger).Log("msg", "Received lifecycle api quit, exiting")
+		logger.Info("Received lifecycle api quit, exiting")
 	}
 }

pkg/exporter/exporter.go

@@ -14,15 +14,14 @@
 package exporter
 
 import (
+	"log/slog"
 	"os"
 	"time"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/prometheus/statsd_exporter/pkg/clock"
 	"github.com/prometheus/statsd_exporter/pkg/event"
-	"github.com/prometheus/statsd_exporter/pkg/level"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
 	"github.com/prometheus/statsd_exporter/pkg/registry"
 )
@@ -43,7 +42,7 @@ type Registry interface {
 type Exporter struct {
 	Mapper                *mapper.MetricMapper
 	Registry              Registry
-	Logger                log.Logger
+	Logger                *slog.Logger
 	EventsActions         *prometheus.CounterVec
 	EventsUnmapped        prometheus.Counter
 	ErrorEventStats       *prometheus.CounterVec
@@ -63,7 +62,7 @@ func (b *Exporter) Listen(e <-chan event.Events) {
 			b.Registry.RemoveStaleMetrics()
 		case events, ok := <-e:
 			if !ok {
-				level.Debug(b.Logger).Log("msg", "Channel is closed. Break out of Exporter.Listener.")
+				b.Logger.Debug("Channel is closed. Break out of Exporter.Listener.")
 				removeStaleMetricsTicker.Stop()
 				return
 			}
@@ -99,7 +98,7 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 	prometheusLabels := thisEvent.Labels()
 	if present {
 		if mapping.Name == "" {
-			level.Debug(b.Logger).Log("msg", "The mapping generates an empty metric name", "metric_name", thisEvent.MetricName(), "match", mapping.Match)
+			b.Logger.Debug("The mapping generates an empty metric name", "metric_name", thisEvent.MetricName(), "match", mapping.Match)
 			b.ErrorEventStats.WithLabelValues("empty_metric_name").Inc()
 			return
 		}
@@ -127,7 +126,7 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 		// We don't accept negative values for counters. Incrementing the counter with a negative number
 		// will cause the exporter to panic. Instead we will warn and continue to the next event.
 		if eventValue < 0.0 {
-			level.Debug(b.Logger).Log("msg", "counter must be non-negative value", "metric", metricName, "event_value", eventValue)
+			b.Logger.Debug("counter must be non-negative value", "metric", metricName, "event_value", eventValue)
 			b.ErrorEventStats.WithLabelValues("illegal_negative_counter").Inc()
 			return
 		}
@@ -137,7 +136,7 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 			counter.Add(eventValue)
 			b.EventStats.WithLabelValues("counter").Inc()
 		} else {
-			level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+			b.Logger.Debug(regErrF, "metric", metricName, "error", err)
 			b.ConflictingEventStats.WithLabelValues("counter").Inc()
 		}
 
@@ -152,7 +151,7 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 			}
 			b.EventStats.WithLabelValues("gauge").Inc()
 		} else {
-			level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+			b.Logger.Debug(regErrF, "metric", metricName, "error", err)
 			b.ConflictingEventStats.WithLabelValues("gauge").Inc()
 		}
 
@@ -172,7 +171,7 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 				histogram.Observe(eventValue)
 				b.EventStats.WithLabelValues("observer").Inc()
 			} else {
-				level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+				b.Logger.Debug(regErrF, "metric", metricName, "error", err)
 				b.ConflictingEventStats.WithLabelValues("observer").Inc()
 			}
 
@@ -182,22 +181,22 @@ func (b *Exporter) handleEvent(thisEvent event.Event) {
 				summary.Observe(eventValue)
 				b.EventStats.WithLabelValues("observer").Inc()
 			} else {
-				level.Debug(b.Logger).Log("msg", regErrF, "metric", metricName, "error", err)
+				b.Logger.Debug(regErrF, "metric", metricName, "error", err)
 				b.ConflictingEventStats.WithLabelValues("observer").Inc()
 			}
 
 		default:
-			level.Error(b.Logger).Log("msg", "unknown observer type", "type", t)
+			b.Logger.Error("unknown observer type", "type", t)
 			os.Exit(1)
 		}
 
 	default:
-		level.Debug(b.Logger).Log("msg", "Unsupported event type")
+		b.Logger.Debug("Unsupported event type")
 		b.EventStats.WithLabelValues("illegal").Inc()
 	}
 }
 
-func NewExporter(reg prometheus.Registerer, mapper *mapper.MetricMapper, logger log.Logger, eventsActions *prometheus.CounterVec, eventsUnmapped prometheus.Counter, errorEventStats *prometheus.CounterVec, eventStats *prometheus.CounterVec, conflictingEventStats *prometheus.CounterVec, metricsCount *prometheus.GaugeVec) *Exporter {
+func NewExporter(reg prometheus.Registerer, mapper *mapper.MetricMapper, logger *slog.Logger, eventsActions *prometheus.CounterVec, eventsUnmapped prometheus.Counter, errorEventStats *prometheus.CounterVec, eventStats *prometheus.CounterVec, conflictingEventStats *prometheus.CounterVec, metricsCount *prometheus.GaugeVec) *Exporter {
 	return &Exporter{
 		Mapper:                mapper,
 		Registry:              registry.NewRegistry(reg, mapper),

pkg/exporter/exporter_test.go

@@ -15,13 +15,14 @@ package exporter
 
 import (
 	"fmt"
+	"log/slog"
 	"net"
 	"testing"
 	"time"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/clock"
 	"github.com/prometheus/statsd_exporter/pkg/event"
@@ -172,7 +173,7 @@ func TestNegativeCounter(t *testing.T) {
 
 	testMapper := mapper.MetricMapper{}
 
-	ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 
 	updated := getTelemetryCounterValue(errorCounter)
@@ -253,7 +254,7 @@ mappings:
 		t.Fatalf("Config load error: %s %s", config, err)
 	}
 
-	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 
 	metrics, err := prometheus.DefaultGatherer.Gather()
@@ -316,7 +317,7 @@ mappings:
 		t.Fatalf("Config load error: %s %s", config, err)
 	}
 
-	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 
 	metrics, err := prometheus.DefaultGatherer.Gather()
@@ -359,14 +360,14 @@ mappings:
     honor_labels: true
 `
 	testMapper := &mapper.MetricMapper{
-		Logger: log.NewNopLogger(),
+		Logger: promslog.NewNopLogger(),
 	}
 	err := testMapper.InitFromYAMLString(config)
 	if err != nil {
 		t.Fatalf("Config load error: %s %s", config, err)
 	}
 
-	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 
 	metrics, err := prometheus.DefaultGatherer.Gather()
@@ -647,7 +648,7 @@ mappings:
 				close(events)
 			}()
 			reg := prometheus.NewRegistry()
-			ex := NewExporter(reg, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+			ex := NewExporter(reg, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 			ex.Listen(events)
 
 			metrics, err := reg.Gather()
@@ -702,7 +703,7 @@ mappings:
 	errorCounter := errorEventStats.WithLabelValues("empty_metric_name")
 	prev := getTelemetryCounterValue(errorCounter)
 
-	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 
 	updated := getTelemetryCounterValue(errorCounter)
@@ -736,7 +737,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 		for _, l := range []statsDPacketHandler{&listener.StatsDUDPListener{
 			Conn:            nil,
 			EventHandler:    nil,
-			Logger:          log.NewNopLogger(),
+			Logger:          promslog.NewNopLogger(),
 			LineParser:      parser,
 			UDPPackets:      udpPackets,
 			UDPPacketDrops:  udpPacketDrops,
@@ -749,7 +750,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 		}, &mockStatsDTCPListener{listener.StatsDTCPListener{
 			Conn:            nil,
 			EventHandler:    nil,
-			Logger:          log.NewNopLogger(),
+			Logger:          promslog.NewNopLogger(),
 			LineParser:      parser,
 			LinesReceived:   linesReceived,
 			EventsFlushed:   eventsFlushed,
@@ -760,7 +761,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 			TCPConnections:  tcpConnections,
 			TCPErrors:       tcpErrors,
 			TCPLineTooLong:  tcpLineTooLong,
-		}, log.NewNopLogger()}} {
+		}, promslog.NewNopLogger()}} {
 			l.SetEventHandler(ueh)
 			l.HandlePacket([]byte("bar:200|c|#tag:value\nbar:200|c|#tag:\xc3\x28invalid"))
 		}
@@ -769,7 +770,7 @@ func TestInvalidUtf8InDatadogTagValue(t *testing.T) {
 
 	testMapper := mapper.MetricMapper{}
 
-	ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+	ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 	ex.Listen(events)
 }
 
@@ -782,7 +783,7 @@ func TestSummaryWithQuantilesEmptyMapping(t *testing.T) {
 	go func() {
 		testMapper := mapper.MetricMapper{}
 
-		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 
@@ -825,7 +826,7 @@ func TestHistogramUnits(t *testing.T) {
 	events := make(chan event.Events)
 	go func() {
 		testMapper := mapper.MetricMapper{}
-		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Mapper.Defaults.ObserverType = mapper.ObserverTypeHistogram
 		ex.Listen(events)
 	}()
@@ -861,7 +862,7 @@ func TestCounterIncrement(t *testing.T) {
 	events := make(chan event.Events)
 	go func() {
 		testMapper := mapper.MetricMapper{}
-		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 
@@ -908,7 +909,7 @@ func TestGaugeIncrementDecrement(t *testing.T) {
 	events := make(chan event.Events)
 	go func() {
 		testMapper := mapper.MetricMapper{}
-		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 
@@ -970,7 +971,7 @@ func TestScaledMapping(t *testing.T) {
 
 	// Start exporter with a synchronous channel
 	go func() {
-		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, &testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 
@@ -1018,7 +1019,7 @@ type statsDPacketHandler interface {
 
 type mockStatsDTCPListener struct {
 	listener.StatsDTCPListener
-	log.Logger
+	*slog.Logger
 }
 
 func (ml *mockStatsDTCPListener) HandlePacket(packet []byte) {
@@ -1079,7 +1080,7 @@ mappings:
 	events := make(chan event.Events)
 	defer close(events)
 	go func() {
-		ex := NewExporter(prometheus.DefaultRegisterer, testMapper, log.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
+		ex := NewExporter(prometheus.DefaultRegisterer, testMapper, promslog.NewNopLogger(), eventsActions, eventsUnmapped, errorEventStats, eventStats, conflictingEventStats, metricsCount)
 		ex.Listen(events)
 	}()
 
@@ -1291,7 +1292,7 @@ func BenchmarkParseDogStatsDTags(b *testing.B) {
 		b.Run(name, func(b *testing.B) {
 			for n := 0; n < b.N; n++ {
 				labels := map[string]string{}
-				parser.ParseDogStatsDTags(tags, labels, tagErrors, log.NewNopLogger())
+				parser.ParseDogStatsDTags(tags, labels, tagErrors, promslog.NewNopLogger())
 			}
 		})
 	}

pkg/level/level.go

@@ -1,97 +0,0 @@
-// Copyright 2021 The Prometheus 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 level
-
-import (
-	"fmt"
-
-	"github.com/go-kit/log"
-	"github.com/go-kit/log/level"
-)
-
-var logLevel = LevelInfo
-
-// A Level is a logging priority. Higher levels are more important.
-type Level int
-
-const (
-	// LevelDebug logs are typically voluminous, and are usually disabled in
-	// production.
-	LevelDebug Level = iota
-	// LevelInfo is the default logging priority.
-	LevelInfo
-	// LevelWarn logs are more important than Info, but don't need individual
-	// human review.
-	LevelWarn
-	// LevelError logs are high-priority. If an application is running smoothly,
-	// it shouldn't generate any error-level logs.
-	LevelError
-)
-
-var emptyLogger = &EmptyLogger{}
-
-type EmptyLogger struct{}
-
-func (l *EmptyLogger) Log(keyvals ...interface{}) error {
-	return nil
-}
-
-// SetLogLevel sets the log level.
-func SetLogLevel(level string) error {
-	switch level {
-	case "debug":
-		logLevel = LevelDebug
-	case "info":
-		logLevel = LevelInfo
-	case "warn":
-		logLevel = LevelWarn
-	case "error":
-		logLevel = LevelError
-	default:
-		return fmt.Errorf("unrecognized log level %s", level)
-	}
-	return nil
-}
-
-// Error returns a logger that includes a Key/ErrorValue pair.
-func Error(logger log.Logger) log.Logger {
-	if logLevel <= LevelError {
-		return level.Error(logger)
-	}
-	return emptyLogger
-}
-
-// Warn returns a logger that includes a Key/WarnValue pair.
-func Warn(logger log.Logger) log.Logger {
-	if logLevel <= LevelWarn {
-		return level.Warn(logger)
-	}
-	return emptyLogger
-}
-
-// Info returns a logger that includes a Key/InfoValue pair.
-func Info(logger log.Logger) log.Logger {
-	if logLevel <= LevelInfo {
-		return level.Info(logger)
-	}
-	return emptyLogger
-}
-
-// Debug returns a logger that includes a Key/DebugValue pair.
-func Debug(logger log.Logger) log.Logger {
-	if logLevel <= LevelDebug {
-		return level.Debug(logger)
-	}
-	return emptyLogger
-}

pkg/level/level_test.go

@@ -1,110 +0,0 @@
-// Copyright 2021 The Prometheus 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 level
-
-import (
-	"bytes"
-	"strings"
-	"testing"
-
-	"github.com/go-kit/log"
-)
-
-func TestSetLogLevel(t *testing.T) {
-	tests := []struct {
-		name     string
-		level    string
-		logLevel Level
-		wantErr  bool
-	}{
-		{"wrong level", "foo", LevelInfo, true},
-		{"level debug", "debug", LevelDebug, false},
-		{"level info", "info", LevelInfo, false},
-		{"level warn", "warn", LevelWarn, false},
-		{"level error", "error", LevelError, false},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			if err := SetLogLevel(tt.level); (err != nil) != tt.wantErr {
-				t.Fatalf("Expected log level to be set successfully, but got %v", err)
-			}
-			if tt.logLevel != logLevel {
-				t.Fatalf("Expected log level %v, but got %v", tt.logLevel, logLevel)
-			}
-		})
-	}
-}
-
-func TestVariousLevels(t *testing.T) {
-	tests := []struct {
-		name  string
-		level string
-		want  string
-	}{
-		{
-			"level debug",
-			"debug",
-			strings.Join([]string{
-				"level=debug log=debug",
-				"level=info log=info",
-				"level=warn log=warn",
-				"level=error log=error",
-			}, "\n"),
-		},
-		{
-			"level info",
-			"info",
-			strings.Join([]string{
-				"level=info log=info",
-				"level=warn log=warn",
-				"level=error log=error",
-			}, "\n"),
-		},
-		{
-			"level warn",
-			"warn",
-			strings.Join([]string{
-				"level=warn log=warn",
-				"level=error log=error",
-			}, "\n"),
-		},
-		{
-			"level error",
-			"error",
-			strings.Join([]string{
-				"level=error log=error",
-			}, "\n"),
-		},
-	}
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			var buf bytes.Buffer
-			logger := log.NewLogfmtLogger(&buf)
-
-			if err := SetLogLevel(tt.level); err != nil {
-				t.Fatalf("Expected log level to be set successfully, but got %v", err)
-			}
-
-			Debug(logger).Log("log", "debug")
-			Info(logger).Log("log", "info")
-			Warn(logger).Log("log", "warn")
-			Error(logger).Log("log", "error")
-
-			got := strings.TrimSpace(buf.String())
-			if tt.want != got {
-				t.Fatalf("Expected log output %v, but got %v", tt.want, got)
-			}
-		})
-	}
-}

pkg/line/line.go

@@ -15,15 +15,14 @@ package line
 
 import (
 	"fmt"
+	"log/slog"
 	"strconv"
 	"strings"
 	"unicode/utf8"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/prometheus/statsd_exporter/pkg/event"
-	"github.com/prometheus/statsd_exporter/pkg/level"
 	"github.com/prometheus/statsd_exporter/pkg/mapper"
 )
 
@@ -95,11 +94,11 @@ func buildEvent(statType, metric string, value float64, relative bool, labels ma
 	}
 }
 
-func parseTag(component, tag string, separator rune, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+func parseTag(component, tag string, separator rune, labels map[string]string, tagErrors prometheus.Counter, logger *slog.Logger) {
 	// Entirely empty tag is an error
 	if len(tag) == 0 {
 		tagErrors.Inc()
-		level.Debug(logger).Log("msg", "Empty name tag", "component", component)
+		logger.Debug("Empty name tag", "component", component)
 		return
 	}
 
@@ -111,7 +110,7 @@ func parseTag(component, tag string, separator rune, labels map[string]string, t
 			if len(k) == 0 || len(v) == 0 {
 				// Empty key or value is an error
 				tagErrors.Inc()
-				level.Debug(logger).Log("msg", "Malformed name tag", "k", k, "v", v, "component", component)
+				logger.Debug("Malformed name tag", "k", k, "v", v, "component", component)
 			} else {
 				labels[mapper.EscapeMetricName(k)] = v
 			}
@@ -121,10 +120,10 @@ func parseTag(component, tag string, separator rune, labels map[string]string, t
 
 	// Missing separator (no value) is an error
 	tagErrors.Inc()
-	level.Debug(logger).Log("msg", "Malformed name tag", "tag", tag, "component", component)
+	logger.Debug("Malformed name tag", "tag", tag, "component", component)
 }
 
-func parseNameTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+func parseNameTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger *slog.Logger) {
 	lastTagEndIndex := 0
 	for i, c := range component {
 		if c == ',' {
@@ -148,7 +147,7 @@ func trimLeftHash(s string) string {
 	return s
 }
 
-func (p *Parser) ParseDogStatsDTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) {
+func (p *Parser) ParseDogStatsDTags(component string, labels map[string]string, tagErrors prometheus.Counter, logger *slog.Logger) {
 	if p.DogstatsdTagsEnabled {
 		lastTagEndIndex := 0
 		for i, c := range component {
@@ -167,7 +166,7 @@ func (p *Parser) ParseDogStatsDTags(component string, labels map[string]string,
 	}
 }
 
-func (p *Parser) parseNameAndTags(name string, labels map[string]string, tagErrors prometheus.Counter, logger log.Logger) string {
+func (p *Parser) parseNameAndTags(name string, labels map[string]string, tagErrors prometheus.Counter, logger *slog.Logger) string {
 	if p.SignalFXTagsEnabled {
 		// check for SignalFx tags first
 		// `[` delimits start of tags by SignalFx
@@ -183,7 +182,7 @@ func (p *Parser) parseNameAndTags(name string, labels map[string]string, tagErro
 			return name[:startIdx] + name[endIdx+1:]
 		case (startIdx != -1) != (endIdx != -1):
 			// only one bracket, return unparsed
-			level.Debug(logger).Log("msg", "invalid SignalFx tags, not parsing", "metric", name)
+			logger.Debug("invalid SignalFx tags, not parsing", "metric", name)
 			tagErrors.Inc()
 			return name
 		}
@@ -202,7 +201,7 @@ func (p *Parser) parseNameAndTags(name string, labels map[string]string, tagErro
 	return name
 }
 
-func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger log.Logger) event.Events {
+func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger *slog.Logger) event.Events {
 	events := event.Events{}
 	if line == "" {
 		return events
@@ -211,7 +210,7 @@ func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, s
 	elements := strings.SplitN(line, ":", 2)
 	if len(elements) < 2 || len(elements[0]) == 0 || !utf8.ValidString(line) {
 		sampleErrors.WithLabelValues("malformed_line").Inc()
-		level.Debug(logger).Log("msg", "bad line", "line", line)
+		logger.Debug("bad line", "line", line)
 		return events
 	}
 
@@ -223,7 +222,7 @@ func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, s
 
 		// don't allow mixed tagging styles
 		sampleErrors.WithLabelValues("mixed_tagging_styles").Inc()
-		level.Debug(logger).Log("msg", "bad line: multiple tagging styles", "line", line)
+		logger.Debug("bad line: multiple tagging styles", "line", line)
 		return events
 	}
 
@@ -231,7 +230,7 @@ func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, s
 	lineParts := strings.SplitN(elements[1], "|", 3)
 	if len(lineParts) < 2 {
 		sampleErrors.WithLabelValues("not_enough_parts_after_colon").Inc()
-		level.Debug(logger).Log("msg", "bad line: not enough '|'-delimited parts after first ':'", "line", line)
+		logger.Debug("bad line: not enough '|'-delimited parts after first ':'", "line", line)
 		return events
 	}
 	if strings.Contains(lineParts[0], ":") {
@@ -256,7 +255,7 @@ func (p *Parser) LineToEvents(line string, sampleErrors prometheus.CounterVec, s
 			samples = aggLines
 		} else {
 			sampleErrors.WithLabelValues("invalid_extended_aggregate_type").Inc()
-			level.Debug(logger).Log("msg", "bad line: invalid extended aggregate type", "line", line)
+			logger.Debug("bad line: invalid extended aggregate type", "line", line)
 			return events
 		}
 	} else if usingDogStatsDTags {
@@ -272,7 +271,7 @@ samples:
 		components := strings.Split(sample, "|")
 		if len(components) < 2 || len(components) > 4 {
 			sampleErrors.WithLabelValues("malformed_component").Inc()
-			level.Debug(logger).Log("msg", "bad component", "line", line)
+			logger.Debug("bad component", "line", line)
 			continue
 		}
 		valueStr, statType := components[0], components[1]
@@ -284,7 +283,7 @@ samples:
 
 		value, err := strconv.ParseFloat(valueStr, 64)
 		if err != nil {
-			level.Debug(logger).Log("msg", "bad value", "value", valueStr, "line", line)
+			logger.Debug("bad value", "value", valueStr, "line", line)
 			sampleErrors.WithLabelValues("malformed_value").Inc()
 			continue
 		}
@@ -293,7 +292,7 @@ samples:
 		if len(components) >= 3 {
 			for _, component := range components[2:] {
 				if len(component) == 0 {
-					level.Debug(logger).Log("msg", "Empty component", "line", line)
+					logger.Debug("Empty component", "line", line)
 					sampleErrors.WithLabelValues("malformed_component").Inc()
 					continue samples
 				}
@@ -305,7 +304,7 @@ samples:
 
 					samplingFactor, err := strconv.ParseFloat(component[1:], 64)
 					if err != nil {
-						level.Debug(logger).Log("msg", "Invalid sampling factor", "component", component[1:], "line", line)
+						logger.Debug("Invalid sampling factor", "component", component[1:], "line", line)
 						sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
 					}
 					if samplingFactor == 0 {
@@ -322,7 +321,7 @@ samples:
 				case '#':
 					p.ParseDogStatsDTags(component[1:], labels, tagErrors, logger)
 				default:
-					level.Debug(logger).Log("msg", "Invalid sampling factor or tag section", "component", components[2], "line", line)
+					logger.Debug("Invalid sampling factor or tag section", "component", components[2], "line", line)
 					sampleErrors.WithLabelValues("invalid_sample_factor").Inc()
 					continue
 				}
@@ -336,7 +335,7 @@ samples:
 		for i := 0; i < multiplyEvents; i++ {
 			event, err := buildEvent(statType, metric, value, relative, labels)
 			if err != nil {
-				level.Debug(logger).Log("msg", "Error building event", "line", line, "error", err)
+				logger.Debug("Error building event", "line", line, "error", err)
 				sampleErrors.WithLabelValues("illegal_event").Inc()
 				continue
 			}

pkg/line/line_test.go

@@ -17,8 +17,8 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/event"
 )
@@ -49,7 +49,7 @@ var (
 			Help: "The number of errors parsing DogStatsD tags.",
 		},
 	)
-	nopLogger = log.NewNopLogger()
+	nopLogger = promslog.NewNopLogger()
 )
 
 func TestLineToEvents(t *testing.T) {

pkg/listener/listener.go

@@ -16,26 +16,25 @@ package listener
 import (
 	"bufio"
 	"io"
+	"log/slog"
 	"net"
 	"os"
 	"strings"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/prometheus/statsd_exporter/pkg/event"
-	"github.com/prometheus/statsd_exporter/pkg/level"
 	"github.com/prometheus/statsd_exporter/pkg/relay"
 )
 
 type Parser interface {
-	LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger log.Logger) event.Events
+	LineToEvents(line string, sampleErrors prometheus.CounterVec, samplesReceived prometheus.Counter, tagErrors prometheus.Counter, tagsReceived prometheus.Counter, logger *slog.Logger) event.Events
 }
 
 type StatsDUDPListener struct {
 	Conn            *net.UDPConn
 	EventHandler    event.EventHandler
-	Logger          log.Logger
+	Logger          *slog.Logger
 	LineParser      Parser
 	UDPPackets      prometheus.Counter
 	UDPPacketDrops  prometheus.Counter
@@ -64,7 +63,7 @@ func (l *StatsDUDPListener) Listen() {
 			if strings.HasSuffix(err.Error(), "use of closed network connection") {
 				return
 			}
-			level.Error(l.Logger).Log("error", err)
+			l.Logger.Error("error reading from UDP connection", "err", err)
 			return
 		}
 
@@ -94,7 +93,7 @@ func (l *StatsDUDPListener) ProcessUdpPacketQueue() {
 func (l *StatsDUDPListener) HandlePacket(packet []byte) {
 	lines := strings.Split(string(packet), "\n")
 	for _, line := range lines {
-		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "udp", "line", line)
+		l.Logger.Debug("Incoming line", "proto", "udp", "line", line)
 		l.LinesReceived.Inc()
 		if l.Relay != nil && len(line) > 0 {
 			l.Relay.RelayLine(line)
@@ -106,7 +105,7 @@ func (l *StatsDUDPListener) HandlePacket(packet []byte) {
 type StatsDTCPListener struct {
 	Conn            *net.TCPListener
 	EventHandler    event.EventHandler
-	Logger          log.Logger
+	Logger          *slog.Logger
 	LineParser      Parser
 	LinesReceived   prometheus.Counter
 	EventsFlushed   prometheus.Counter
@@ -133,7 +132,7 @@ func (l *StatsDTCPListener) Listen() {
 			if strings.HasSuffix(err.Error(), "use of closed network connection") {
 				return
 			}
-			level.Error(l.Logger).Log("msg", "AcceptTCP failed", "error", err)
+			l.Logger.Error("AcceptTCP failed", "error", err)
 			os.Exit(1)
 		}
 		go l.HandleConn(c)
@@ -151,14 +150,14 @@ func (l *StatsDTCPListener) HandleConn(c *net.TCPConn) {
 		if err != nil {
 			if err != io.EOF {
 				l.TCPErrors.Inc()
-				level.Debug(l.Logger).Log("msg", "Read failed", "addr", c.RemoteAddr(), "error", err)
+				l.Logger.Debug("Read failed", "addr", c.RemoteAddr(), "error", err)
 			}
 			break
 		}
-		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "tcp", "line", string(line))
+		l.Logger.Debug("Incoming line", "proto", "tcp", "line", string(line))
 		if isPrefix {
 			l.TCPLineTooLong.Inc()
-			level.Debug(l.Logger).Log("msg", "Read failed: line too long", "addr", c.RemoteAddr())
+			l.Logger.Debug("Read failed: line too long", "addr", c.RemoteAddr())
 			break
 		}
 		l.LinesReceived.Inc()
@@ -172,7 +171,7 @@ func (l *StatsDTCPListener) HandleConn(c *net.TCPConn) {
 type StatsDUnixgramListener struct {
 	Conn            *net.UnixConn
 	EventHandler    event.EventHandler
-	Logger          log.Logger
+	Logger          *slog.Logger
 	LineParser      Parser
 	UnixgramPackets prometheus.Counter
 	LinesReceived   prometheus.Counter
@@ -198,7 +197,7 @@ func (l *StatsDUnixgramListener) Listen() {
 			if strings.HasSuffix(err.Error(), "use of closed network connection") {
 				return
 			}
-			level.Error(l.Logger).Log(err)
+			l.Logger.Error("error reading from unixgram connection", "err", err)
 			os.Exit(1)
 		}
 		l.HandlePacket(buf[:n])
@@ -209,7 +208,7 @@ func (l *StatsDUnixgramListener) HandlePacket(packet []byte) {
 	l.UnixgramPackets.Inc()
 	lines := strings.Split(string(packet), "\n")
 	for _, line := range lines {
-		level.Debug(l.Logger).Log("msg", "Incoming line", "proto", "unixgram", "line", line)
+		l.Logger.Debug("Incoming line", "proto", "unixgram", "line", line)
 		l.LinesReceived.Inc()
 		if l.Relay != nil && len(line) > 0 {
 			l.Relay.RelayLine(line)

pkg/mapper/fsm/fsm.go

@@ -14,12 +14,9 @@
 package fsm
 
 import (
+	"log/slog"
 	"regexp"
 	"strings"
-
-	"github.com/go-kit/log"
-
-	"github.com/prometheus/statsd_exporter/pkg/level"
 )
 
 type mappingState struct {
@@ -234,7 +231,7 @@ func (f *FSM) GetMapping(statsdMetric string, statsdMetricType string) (*mapping
 
 // TestIfNeedBacktracking tests if backtrack is needed for given list of mappings
 // and whether ordering is disabled.
-func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger log.Logger) bool {
+func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger *slog.Logger) bool {
 	backtrackingNeeded := false
 	// A has * in rules, but there's other transisitions at the same state,
 	// this makes A the cause of backtracking
@@ -250,7 +247,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger log
 		metricRe = strings.Replace(metricRe, "*", "([^.]*)", -1)
 		regex, err := regexp.Compile("^" + metricRe + "$")
 		if err != nil {
-			level.Warn(logger).Log("msg", "Invalid match, cannot compile regex in mapping", "mapping", mapping, "err", err)
+			logger.Warn("Invalid match, cannot compile regex in mapping", "mapping", mapping, "err", err)
 		}
 		// put into array no matter there's error or not, we will skip later if regex is nil
 		ruleREByLength[l] = append(ruleREByLength[l], regex)
@@ -293,7 +290,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger log
 				if i2 != i1 && len(re1.FindStringSubmatchIndex(r2)) > 0 {
 					// log if we care about ordering and the superset occurs before
 					if !orderingDisabled && i1 < i2 {
-						level.Warn(logger).Log("msg", "match is a super set of match but in a lower order, the first will never be matched", "first_match", r1, "second_match", r2)
+						logger.Warn("match is a super set of match but in a lower order, the first will never be matched", "first_match", r1, "second_match", r2)
 					}
 					currentRuleNeedBacktrack = false
 				}
@@ -311,7 +308,7 @@ func TestIfNeedBacktracking(mappings []string, orderingDisabled bool, logger log
 			}
 
 			if currentRuleNeedBacktrack {
-				level.Warn(logger).Log("msg", "backtracking required because of match. Performance may be degraded", "match", r1)
+				logger.Warn("backtracking required because of match. Performance may be degraded", "match", r1)
 				backtrackingNeeded = true
 			}
 		}

pkg/mapper/mapper.go

@@ -15,16 +15,16 @@ package mapper
 
 import (
 	"fmt"
+	"log/slog"
 	"os"
 	"regexp"
 	"sync"
 	"time"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/promslog"
 	"gopkg.in/yaml.v2"
 
-	"github.com/prometheus/statsd_exporter/pkg/level"
 	"github.com/prometheus/statsd_exporter/pkg/mapper/fsm"
 )
 
@@ -53,7 +53,7 @@ type MetricMapper struct {
 
 	MappingsCount prometheus.Gauge
 
-	Logger log.Logger
+	Logger *slog.Logger
 }
 
 type SummaryOptions struct {
@@ -174,12 +174,12 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 
 		if currentMapping.LegacyQuantiles != nil &&
 			(currentMapping.SummaryOptions == nil || currentMapping.SummaryOptions.Quantiles != nil) {
-			level.Warn(m.Logger).Log("msg", "using the top level quantiles is deprecated.  Please use quantiles in the summary_options hierarchy")
+			m.Logger.Warn("using the top level quantiles is deprecated.  Please use quantiles in the summary_options hierarchy")
 		}
 
 		if currentMapping.LegacyBuckets != nil &&
 			(currentMapping.HistogramOptions == nil || currentMapping.HistogramOptions.Buckets != nil) {
-			level.Warn(m.Logger).Log("msg", "using the top level buckets is deprecated.  Please use buckets in the histogram_options hierarchy")
+			m.Logger.Warn("using the top level buckets is deprecated.  Please use buckets in the histogram_options hierarchy")
 		}
 
 		if currentMapping.SummaryOptions != nil &&
@@ -242,7 +242,7 @@ func (m *MetricMapper) InitFromYAMLString(fileContents string) error {
 	defer m.mutex.Unlock()
 
 	if m.Logger == nil {
-		m.Logger = log.NewNopLogger()
+		m.Logger = promslog.NewNopLogger()
 	}
 
 	m.Defaults = n.Defaults

pkg/mapper/mapper_benchmark_test.go

@@ -18,7 +18,7 @@ import (
 	"math/rand"
 	"testing"
 
-	"github.com/go-kit/log"
+	"github.com/prometheus/common/promslog"
 
 	"github.com/prometheus/statsd_exporter/pkg/mappercache/lru"
 	"github.com/prometheus/statsd_exporter/pkg/mappercache/randomreplacement"
@@ -245,7 +245,7 @@ mappings:
 	}
 
 	mapper := MetricMapper{
-		Logger: log.NewNopLogger(),
+		Logger: promslog.NewNopLogger(),
 	}
 	err := mapper.InitFromYAMLString(config)
 	if err != nil {

pkg/relay/relay.go

@@ -16,24 +16,22 @@ package relay
 import (
 	"bytes"
 	"fmt"
+	"log/slog"
 	"net"
 	"strings"
 	"time"
 
 	"github.com/prometheus/statsd_exporter/pkg/clock"
 
-	"github.com/go-kit/log"
-
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prometheus/statsd_exporter/pkg/level"
 )
 
 type Relay struct {
 	addr          *net.UDPAddr
 	bufferChannel chan []byte
 	conn          *net.UDPConn
-	logger        log.Logger
+	logger        *slog.Logger
 	packetLength  uint
 
 	packetsTotal      prometheus.Counter
@@ -67,7 +65,7 @@ var (
 
 // NewRelay creates a statsd UDP relay. It can be used to send copies of statsd raw
 // lines to a separate service.
-func NewRelay(l log.Logger, target string, packetLength uint) (*Relay, error) {
+func NewRelay(l *slog.Logger, target string, packetLength uint) (*Relay, error) {
 	addr, err := net.ResolveUDPAddr("udp", target)
 	if err != nil {
 		return nil, fmt.Errorf("unable to resolve target %s, err: %w", target, err)
@@ -110,24 +108,24 @@ func (r *Relay) relayOutput() {
 		case <-relayInterval.C:
 			err = r.sendPacket(buffer.Bytes())
 			if err != nil {
-				level.Error(r.logger).Log("msg", "Error sending UDP packet", "error", err)
+				r.logger.Error("Error sending UDP packet", "error", err)
 				return
 			}
 			// Clear out the buffer.
 			buffer.Reset()
 		case b := <-r.bufferChannel:
 			if uint(len(b)+buffer.Len()) > r.packetLength {
-				level.Debug(r.logger).Log("msg", "Buffer full, sending packet", "length", buffer.Len())
+				r.logger.Debug("Buffer full, sending packet", "length", buffer.Len())
 				err = r.sendPacket(buffer.Bytes())
 				if err != nil {
-					level.Error(r.logger).Log("msg", "Error sending UDP packet", "error", err)
+					r.logger.Error("Error sending UDP packet", "error", err)
 					return
 				}
 				// Seed the new buffer with the new line.
 				buffer.Reset()
 				buffer.Write(b)
 			} else {
-				level.Debug(r.logger).Log("msg", "Adding line to buffer", "line", string(b))
+				r.logger.Debug("Adding line to buffer", "line", string(b))
 				buffer.Write(b)
 			}
 		}
@@ -137,10 +135,10 @@ func (r *Relay) relayOutput() {
 // sendPacket sends a single relay line to the destination target.
 func (r *Relay) sendPacket(buf []byte) error {
 	if len(buf) == 0 {
-		level.Debug(r.logger).Log("msg", "Empty buffer, nothing to send")
+		r.logger.Debug("Empty buffer, nothing to send")
 		return nil
 	}
-	level.Debug(r.logger).Log("msg", "Sending packet", "length", len(buf), "data", string(buf))
+	r.logger.Debug("Sending packet", "length", len(buf), "data", string(buf))
 	_, err := r.conn.WriteToUDP(buf, r.addr)
 	r.packetsTotal.Inc()
 	return err
@@ -150,15 +148,15 @@ func (r *Relay) sendPacket(buf []byte) error {
 func (r *Relay) RelayLine(l string) {
 	lineLength := uint(len(l))
 	if lineLength == 0 {
-		level.Debug(r.logger).Log("msg", "Empty line, not relaying")
+		r.logger.Debug("Empty line, not relaying")
 		return
 	}
 	if lineLength > r.packetLength-1 {
-		level.Warn(r.logger).Log("msg", "line too long, not relaying", "length", lineLength, "max", r.packetLength)
+		r.logger.Warn("line too long, not relaying", "length", lineLength, "max", r.packetLength)
 		r.longLinesTotal.Inc()
 		return
 	}
-	level.Debug(r.logger).Log("msg", "Relaying line", "line", string(l))
+	r.logger.Debug("Relaying line", "line", string(l))
 	if !strings.HasSuffix(l, "\n") {
 		l = l + "\n"
 	}

pkg/relay/relay_test.go

@@ -19,9 +19,9 @@ import (
 	"testing"
 	"time"
 
-	"github.com/go-kit/log"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
+	"github.com/prometheus/common/promslog"
 	"github.com/prometheus/statsd_exporter/pkg/clock"
 	"github.com/stvp/go-udp-testing"
 )
@@ -54,7 +54,7 @@ func TestRelay_RelayLine(t *testing.T) {
 			}
 			clock.ClockInstance.Instant = time.Unix(0, 0)
 
-			logger := log.NewNopLogger()
+			logger := promslog.NewNopLogger()
 			r, err := NewRelay(
 				logger,
 				"localhost:1160",