Debug: Add local make_metrics_app

Author: nss10

gen3workflow/app.py

@@ -17,6 +17,8 @@
 from gen3workflow.routes.system import router as system_router
 from gen3workflow.auth import Auth
 
+from prometheus_client import CollectorRegistry, make_asgi_app, multiprocess
+
 
 def get_app(httpx_client=None) -> FastAPI:
     logger.info("Initializing app")
@@ -73,7 +75,9 @@ def get_app(httpx_client=None) -> FastAPI:
         logger.debug(
             f"Vieweing metrics associated with the registry {list(app.metrics._registry.collect())=}"
         )
-        app.mount("/metrics", app.metrics.get_asgi_app())
+        metrics_app = make_metrics_app(config["PROMETHEUS_MULTIPROC_DIR"])
+        app.mount("/metrics", metrics_app)
+        # app.mount("/metrics", app.metrics.get_asgi_app())
 
     @app.middleware("http")
     async def middleware_log_response_and_api_metric(
@@ -117,4 +121,14 @@ async def middleware_log_response_and_api_metric(
     return app
 
 
+def make_metrics_app(prometheus_multiproc_dir):
+    """
+    Required for Prometheus multiprocess setup
+    See: https://prometheus.github.io/client_python/multiprocess/
+    """
+    registry = CollectorRegistry()
+    multiprocess.MultiProcessCollector(registry, prometheus_multiproc_dir)
+    return make_asgi_app(registry=registry)
+
+
 app = get_app()