Discard the otel logs (#5146)

Signed-off-by: Shinnosuke Sawada-Dazai <[email protected]>

go.mod

@@ -22,6 +22,7 @@ require (
 	github.com/envoyproxy/go-control-plane v0.12.0
 	github.com/envoyproxy/protoc-gen-validate v1.0.4
 	github.com/fsouza/fake-gcs-server v1.21.0
+	github.com/go-logr/logr v1.4.2
 	github.com/go-sql-driver/mysql v1.6.0
 	github.com/goccy/go-yaml v1.9.8
 	github.com/golang-jwt/jwt v3.2.1+incompatible
@@ -114,7 +115,6 @@ require (
 	github.com/fatih/color v1.10.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/form3tech-oss/jwt-go v3.2.3+incompatible // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/go-openapi/jsonpointer v0.19.5 // indirect
 	github.com/go-openapi/jsonreference v0.19.5 // indirect

pkg/app/piped/cmd/piped/piped.go

@@ -33,6 +33,7 @@ import (
 	secretmanagerpb "cloud.google.com/go/secretmanager/apiv1/secretmanagerpb"
 	awsconfig "github.com/aws/aws-sdk-go-v2/config"
 	awssecretsmanager "github.com/aws/aws-sdk-go-v2/service/secretsmanager"
+	"github.com/go-logr/logr"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/spf13/cobra"
@@ -241,6 +242,11 @@ func (p *piped) run(ctx context.Context, input cli.Input) (runErr error) {
 	}
 	otel.SetTracerProvider(tracerProvider)
 
+	// if control plane's flag monitoring.enabled is false, otel provider logs errors.
+	// it's no problem but we don't want to see it.
+	// so we discard the logger.
+	otel.SetLogger(logr.Discard())
+
 	// Send the newest piped meta to the control-plane.
 	if err := p.sendPipedMeta(ctx, apiClient, cfg, input.Logger); err != nil {
 		input.Logger.Error("failed to report piped meta to control-plane", zap.Error(err))