warning about missing prometheus endpoint happens only once

pyinfra/flask.py

@@ -6,7 +6,6 @@ from waitress import serve
 
 from pyinfra.config import CONFIG
 
-
 logger = logging.getLogger(__file__)
 logger.setLevel(CONFIG.service.logging_level)
 
@@ -31,6 +30,7 @@ def run_probing_webserver(app, host=None, port=None, mode=None):
 def set_up_probing_webserver():
     # TODO: implement meaningful checks
     app = Flask(__name__)
+    informed_about_missing_prometheus_endpoint = False
 
     @app.route("/ready", methods=["GET"])
     def ready():
@@ -46,12 +46,15 @@ def set_up_probing_webserver():
 
     @app.route("/prometheus", methods=["GET"])
     def get_metrics_from_analysis_endpoint():
+        nonlocal informed_about_missing_prometheus_endpoint
         try:
             resp = requests.get(f"{CONFIG.rabbitmq.callback.analysis_endpoint}/prometheus")
             resp.raise_for_status()
             return resp.text
         except Exception as err:
-            logger.warning(f"Got no metrics from analysis prometheus endpoint: {err}")
+            if not informed_about_missing_prometheus_endpoint:
+                logger.warning(f"Got no metrics from analysis prometheus endpoint: {err}")
+                informed_about_missing_prometheus_endpoint = True
             return resp
 
     return app