Add metrics and healthcheck refactor

fastapi_file_server/core/app.py

@@ -1,5 +1,7 @@
 from fastapi import FastAPI
 
+from prometheus_fastapi_instrumentator import Instrumentator
+
 from app.on_start import on_start
 from app.views import router, healthcheck_router
 from core.db import database
@@ -27,4 +29,6 @@ def start_app() -> FastAPI:
         if database_.is_connected:
             await database_.disconnect()
 
+    Instrumentator().instrument(app).expose(app, include_in_schema=True)
+
     return app