Add observabilitty and monitoring

config.example.yaml

@@ -10,6 +10,26 @@ rate_limit:
   requests_per_second: 10  # Max requests per second per IP (default: 10)
   burst: 20  # Maximum burst size (default: 20)
 
+observability:
+  enabled: false  # Enable observability features (metrics and tracing)
+
+  metrics:
+    enabled: false  # Enable Prometheus metrics
+    path: "/metrics"  # Metrics endpoint path (default: /metrics)
+
+  tracing:
+    enabled: false  # Enable OpenTelemetry tracing
+    service_name: "llm-gateway"  # Service name for traces (default: llm-gateway)
+    sampler:
+      type: "probability"  # Sampling type: "always", "never", "probability"
+      rate: 0.1  # Sample rate for probability sampler (0.0 to 1.0, default: 0.1 = 10%)
+    exporter:
+      type: "otlp"  # Exporter type: "otlp" (production), "stdout" (development)
+      endpoint: "localhost:4317"  # OTLP collector endpoint (gRPC)
+      insecure: true  # Use insecure connection (for development)
+      # headers:  # Optional: custom headers for authentication
+      #   authorization: "Bearer your-token-here"
+
 providers:
   google:
     type: "google"