feat(otel): implemetn otel

Author: yoshinorin

.env.example

@@ -0,0 +1,15 @@
+# OpenTelemetry Configuration
+
+# Individual endpoint configuration (preferred)
+OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://localhost:4318/v1/traces
+OTEL_EXPORTER_OTLP_METRICS_ENDPOINT=http://localhost:4318/v1/metrics
+OTEL_EXPORTER_OTLP_LOGS_ENDPOINT=http://localhost:4318/v1/logs
+
+# Authentication headers
+# Examples:
+# OTEL_EXPORTER_OTLP_HEADERS=Authorization=Basic {base64-encoded-credentials}
+# OTEL_EXPORTER_OTLP_HEADERS=x-api-key={your-api-key}
+OTEL_EXPORTER_OTLP_HEADERS=
+
+# Service name
+OTEL_SERVICE_NAME=quintet

next.config.js

@@ -62,5 +62,9 @@ module.exports = {
     unoptimized: true
   },
   poweredByHeader: false,
-  compress: false // already gzipped with the `HTTP server`. No need with `Next.js`.
+  compress: false, // already gzipped with the `HTTP server`. No need with `Next.js`.
+  serverExternalPackages: [
+    "@opentelemetry/auto-instrumentations-node",
+    "@opentelemetry/sdk-node"
+  ]
 };