expose metrics on port 9000

ops_bot/main.py

@@ -7,7 +7,6 @@ from typing import Any, AsyncIterator, Dict, List, Optional, Protocol, Tuple, ca
 
 import json_logging
 import uvicorn
-from prometheus_fastapi_instrumentator import Instrumentator
 from fastapi import Depends, FastAPI, HTTPException, Request, status
 from fastapi.security import (
     HTTPAuthorizationCredentials,
@@ -15,6 +14,8 @@ from fastapi.security import (
     HTTPBasicCredentials,
     HTTPBearer,
 )
+from prometheus_client import start_http_server
+from prometheus_fastapi_instrumentator import Instrumentator
 
 from ops_bot import alertmanager, aws, pagerduty
 from ops_bot.config import BotSettings, RoutingKey, load_config
@@ -35,7 +36,6 @@ async def matrix_main(matrix_client: MatrixClient) -> None:
 
 @asynccontextmanager
 async def lifespan(app: FastAPI) -> AsyncIterator[None]:
-    instrumentator.expose(app)
     config_fname = os.environ.get("BOT_CONFIG_FILE", "config.yaml")
     bot_settings = load_config(config_fname)
     c = MatrixClient(settings=bot_settings.matrix, join_rooms=bot_settings.get_rooms())
@@ -46,6 +46,7 @@ async def lifespan(app: FastAPI) -> AsyncIterator[None]:
     await app.state.matrix_client.shutdown()
 
 
+start_http_server(9000)
 app = FastAPI(lifespan=lifespan)
 instrumentator = Instrumentator().instrument(app)
 bearer_security = HTTPBearer(auto_error=False)