Add more logging to builder_alerts to see why metrics are not reported

infra/services/builder_alerts/crbug_issues.py

Index: infra/services/builder_alerts/crbug_issues.py
diff --git a/infra/services/builder_alerts/crbug_issues.py b/infra/services/builder_alerts/crbug_issues.py
index b4d49ab075175442e4bb2ae00845a8919ae4c2ad..e3eee1db7c169b5be4b4c2d955e959ffa688d6ee 100644
--- a/infra/services/builder_alerts/crbug_issues.py
+++ b/infra/services/builder_alerts/crbug_issues.py
@@ -5,6 +5,7 @@
 from collections import defaultdict
 import datetime
 import json
+import logging
 
 from apiclient import discovery
 from apiclient.errors import HttpError
@@ -52,6 +53,7 @@ def _list_issues(crbug_service_account):
       response = request.execute(num_retries=5)
       issue_tracker_requests.increment(
           {'source': 'builder_alerts', 'operation': 'issues_list'})
+      logging.debug('Incremented issue_tracker_requests counter')
   
       # Issue Tracker may omit certain issues occasionally, so counting whether
       # they add up to 'totalResults' in response is not relaible. However, we