feat(prometheus): add custom metrics

7project/backend/app/app.py

@@ -9,6 +9,8 @@ from fastapi.middleware.cors import CORSMiddleware
 from prometheus_fastapi_instrumentator import Instrumentator, metrics
 from starlette.requests import Request
 
+from app.services.prometheus import number_of_users, number_of_transactions
+
 from app.services import bank_scraper
 from app.workers.celery_tasks import load_transactions, load_all_transactions
 from app.models.user import User, OAuthAccount
@@ -50,6 +52,9 @@ fastApi.add_middleware(
 
 prometheus = Instrumentator().instrument(fastApi)
 
+# Register custom metrics
+prometheus.add(number_of_users()).add(number_of_transactions())
+
 prometheus.expose(
     fastApi,
     endpoint="/metrics",