chore: remove go-kit/log from the agent

go.mod

@@ -5,7 +5,6 @@ go 1.24.0
 toolchain go1.24.6
 
 require (
-	github.com/go-kit/kit v0.13.0
 	github.com/go-logfmt/logfmt v0.6.0
 	github.com/gogo/googleapis v1.4.1
 	github.com/gogo/protobuf v1.3.2
@@ -32,7 +31,6 @@ require (
 	github.com/KimMachineGun/automemlimit v0.7.4
 	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b
 	github.com/felixge/httpsnoop v1.0.4
-	github.com/go-kit/log v0.2.1
 	github.com/gogo/status v1.1.1
 	github.com/grafana/loki/pkg/push v0.0.0-20250903135404-0b2d0b070e96
 	github.com/jpillora/backoff v1.0.0
@@ -41,7 +39,6 @@ require (
 	github.com/quasilyte/go-ruleguard/dsl v0.3.22
 	github.com/spf13/afero v1.14.0
 	golang.org/x/exp v0.0.0-20250819193227-8b4c13bb791b
-	gopkg.in/yaml.v3 v3.0.1
 	kernel.org/pub/linux/libs/security/libcap/cap v1.2.76
 )
 
@@ -76,6 +73,7 @@ require (
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20250707201910-8d1bb00bc6a7 // indirect
 	google.golang.org/protobuf v1.36.6 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	kernel.org/pub/linux/libs/security/libcap/psx v1.2.76 // indirect
 )
 

go.sum

@@ -43,10 +43,6 @@ github.com/dennwc/varint v1.0.0/go.mod h1:hnItb35rvZvJrbTALZtY/iQfDs48JKRG1RPpgz
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/felixge/httpsnoop v1.0.4 h1:NFTV2Zj1bL4mc9sqWACXbQFVBBg2W3GPvqp8/ESS2Wg=
 github.com/felixge/httpsnoop v1.0.4/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
-github.com/go-kit/kit v0.13.0 h1:OoneCcHKHQ03LfBpoQCUfCluwd2Vt3ohz+kvbJneZAU=
-github.com/go-kit/kit v0.13.0/go.mod h1:phqEHMMUbyrCFCTgH48JueqrM3md2HcAZ8N3XE4FKDg=
-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/go-logr/logr v1.4.3 h1:CjnDlHq8ikf6E492q6eKboGOC0T8CDaOvkHCIg8idEI=

internal/adhoc/adhoc.go

@@ -464,34 +464,16 @@ func sleepCtx(ctx context.Context, d time.Duration) error {
 	return err
 }
 
-// jsonLogger implements the log.Logger interface.
-type jsonLogger struct {
-	entries []map[string]string
-}
-
-// Log takes key-value pairs and logs them.
-func (l *jsonLogger) Log(keyvals ...interface{}) error {
-	m := make(map[string]string)
-	if len(keyvals)%2 != 0 {
-		return fmt.Errorf("expected even number of keyvals, got %d", len(keyvals))
-	}
-	for i := 0; i < len(keyvals); i += 2 {
-		k := fmt.Sprintf("%v", keyvals[i])
-		v := fmt.Sprintf("%v", keyvals[i+1])
-		m[k] = v
-	}
-	l.entries = append(l.entries, m)
-	return nil
-}
-
 // Run runs the specified prober once and captures the results using
 // jsonLogger.
 func (r *runner) Run(ctx context.Context, tenantId model.GlobalID, publisher pusher.Publisher) {
 	r.logger.Info().Msg("running ad-hoc check")
 
 	registry := prometheus.NewRegistry()
 
-	logger := &jsonLogger{}
+	// Create a logger that captures entries for later use
+	var logBuf bytes.Buffer
+	zlogger := zerolog.New(&logBuf)
 
 	// TODO(mem): decide what to do with these metrics.
 	successGauge := prometheus.NewGauge(prometheus.GaugeOpts{
@@ -513,7 +495,7 @@ func (r *runner) Run(ctx context.Context, tenantId model.GlobalID, publisher pus
 	rCtx, cancel := context.WithTimeout(ctx, r.timeout)
 	defer cancel()
 
-	success, duration := r.prober.Probe(rCtx, r.target, registry, logger)
+	success, duration := r.prober.Probe(rCtx, r.target, registry, zlogger)
 
 	if success {
 		successGauge.Set(1)
@@ -538,7 +520,7 @@ func (r *runner) Run(ctx context.Context, tenantId model.GlobalID, publisher pus
 		Str("target", r.target).
 		Str("probe", r.probe).
 		Str("check_name", r.prober.Name()).
-		Interface("logs", logger.entries).
+		Str("logs", logBuf.String()).
 		Interface("timeseries", mfs).
 		Msg("ad-hoc check done")
 

internal/adhoc/adhoc_test.go

@@ -20,7 +20,6 @@ import (
 	"github.com/grafana/synthetic-monitoring-agent/internal/feature"
 	"github.com/grafana/synthetic-monitoring-agent/internal/k6runner"
 	"github.com/grafana/synthetic-monitoring-agent/internal/prober"
-	"github.com/grafana/synthetic-monitoring-agent/internal/prober/logger"
 	"github.com/grafana/synthetic-monitoring-agent/internal/pusher"
 	"github.com/grafana/synthetic-monitoring-agent/internal/testhelper"
 	sm "github.com/grafana/synthetic-monitoring-agent/pkg/pb/synthetic_monitoring"
@@ -341,14 +340,14 @@ func (p *testProber) Name() string {
 	return "test"
 }
 
-func (p *testProber) Probe(ctx context.Context, target string, registry *prometheus.Registry, logger logger.Logger) (bool, float64) {
+func (p *testProber) Probe(ctx context.Context, target string, registry *prometheus.Registry, zlogger zerolog.Logger) (bool, float64) {
 	p.logger.Info().Str("func", "Probe").Caller(0).Send()
 	g := prometheus.NewGauge(prometheus.GaugeOpts{
 		Name: "test",
 	})
 	g.Set(1)
 	registry.MustRegister(g)
-	_ = logger.Log("msg", "test")
+	zlogger.Info().Str("msg", "test").Send()
 	return true, 1
 }
 

internal/checks/checks_test.go

@@ -20,7 +20,6 @@ import (
 	"github.com/grafana/synthetic-monitoring-agent/internal/k6runner"
 	"github.com/grafana/synthetic-monitoring-agent/internal/model"
 	"github.com/grafana/synthetic-monitoring-agent/internal/prober"
-	"github.com/grafana/synthetic-monitoring-agent/internal/prober/logger"
 	"github.com/grafana/synthetic-monitoring-agent/internal/pusher"
 	"github.com/grafana/synthetic-monitoring-agent/internal/scraper"
 	"github.com/grafana/synthetic-monitoring-agent/internal/telemetry"
@@ -443,7 +442,7 @@ func (testProber) Name() string {
 	return "test-prober"
 }
 
-func (testProber) Probe(ctx context.Context, target string, registry *prometheus.Registry, logger logger.Logger) (bool, float64) {
+func (testProber) Probe(ctx context.Context, target string, registry *prometheus.Registry, zlogger zerolog.Logger) (bool, float64) {
 	return false, 0
 }