Add telemetry

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"fmt"
+	"io"
 	"net/http"
 	"os"
 	"os/signal"
@@ -14,6 +15,7 @@ import (
 	"github.com/fujin/anthropic-proxy/internal/logging"
 	"github.com/fujin/anthropic-proxy/internal/proxy"
 	"github.com/fujin/anthropic-proxy/internal/server"
+	"github.com/fujin/anthropic-proxy/internal/telemetry"
 	"github.com/rs/zerolog/log"
 )
 
@@ -23,6 +25,18 @@ func run() error {
 		return fmt.Errorf("load config: %w", err)
 	}
 
+	// Initialize telemetry (metrics always active; OTLP export when endpoint set)
+	telemetryShutdown, logBridge, err := telemetry.Setup(context.Background(), cfg.Telemetry)
+	if err != nil {
+		return fmt.Errorf("telemetry setup: %w", err)
+	}
+	defer telemetryShutdown(context.Background())
+
+	var extraWriters []io.Writer
+	if logBridge != nil {
+		extraWriters = append(extraWriters, logBridge)
+	}
+
 	logging.Setup(logging.Config{
 		Level:      cfg.Logging.Level,
 		File:       cfg.Logging.File,
@@ -30,7 +44,7 @@ func run() error {
 		MaxBackups: cfg.Logging.MaxBackups,
 		MaxAgeDays: cfg.Logging.MaxAgeDays,
 		Compress:   cfg.Logging.Compress,
-	})
+	}, extraWriters...)
 
 	// Load credentials from ~/.claude/.credentials.json
 	creds, err := config.LoadDefaultCredentials()