feat(P1): Add /metrics endpoint to gateway

gateway-bot/metrics.py

@@ -0,0 +1,90 @@
+"""
+Gateway Prometheus Metrics
+Стандартизовані метрики для observability
+"""
+from prometheus_client import Counter, Histogram, Gauge, Info, generate_latest, CONTENT_TYPE_LATEST
+
+# === HTTP Metrics ===
+HTTP_REQUESTS_TOTAL = Counter(
+    "gateway_http_requests_total",
+    "Total HTTP requests",
+    ["method", "endpoint", "status"]
+)
+
+HTTP_REQUEST_DURATION = Histogram(
+    "gateway_http_request_duration_seconds",
+    "HTTP request duration",
+    ["method", "endpoint"],
+    buckets=[0.1, 0.5, 1.0, 2.0, 5.0, 10.0, 30.0, 60.0, 120.0]
+)
+
+# === Agent Metrics ===
+AGENT_RUNS_TOTAL = Counter(
+    "gateway_agent_runs_total",
+    "Total agent runs",
+    ["agent", "status"]  # status: started, completed, failed
+)
+
+AGENT_RUN_DURATION = Histogram(
+    "gateway_agent_run_duration_seconds",
+    "Agent run duration",
+    ["agent"],
+    buckets=[1.0, 5.0, 10.0, 30.0, 60.0, 120.0, 300.0]
+)
+
+# === LLM/Router Metrics ===
+ROUTER_CALLS_TOTAL = Counter(
+    "gateway_router_calls_total",
+    "Total calls to router",
+    ["status"]  # success, error, timeout
+)
+
+ROUTER_LATENCY = Histogram(
+    "gateway_router_latency_seconds",
+    "Router call latency",
+    buckets=[0.5, 1.0, 2.0, 5.0, 10.0, 30.0, 60.0, 120.0]
+)
+
+# === Memory Service Metrics ===
+MEMORY_CALLS_TOTAL = Counter(
+    "gateway_memory_calls_total",
+    "Total calls to memory service",
+    ["operation", "status"]  # operation: save, search, delete
+)
+
+# === Telegram Metrics ===
+TELEGRAM_MESSAGES_TOTAL = Counter(
+    "gateway_telegram_messages_total",
+    "Total Telegram messages processed",
+    ["agent", "direction"]  # direction: incoming, outgoing
+)
+
+# === Errors ===
+ERRORS_TOTAL = Counter(
+    "gateway_errors_total",
+    "Total errors",
+    ["type", "source"]
+)
+
+# === Active connections ===
+ACTIVE_REQUESTS = Gauge(
+    "gateway_active_requests",
+    "Currently active requests"
+)
+
+# === Service info ===
+SERVICE_INFO = Info(
+    "gateway_service",
+    "Gateway service information"
+)
+SERVICE_INFO.info({"version": "2.0.0", "node": "node1"})
+
+
+def get_metrics():
+    """Return metrics in Prometheus format"""
+    return generate_latest()
+
+
+def get_content_type():
+    """Return Prometheus content type"""
+    return CONTENT_TYPE_LATEST