don't monitor unknown 400s

files/gitlab_alerts.yml

@@ -20,7 +20,7 @@ groups:
       description: "The HTTP 5xx error rate is above 5%.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"
 
   - alert: GitLabHigh4xxResponses
-    expr: rate(http_requests_total{job=~"gitlab.*", status=~"4.."}[5m]) / rate(http_requests_total{job=~"gitlab.*"}[5m]) > 0.10
+    expr: rate(http_requests_total{job=~"gitlab.*", status=~"4..",feature_category!="unknown"}[5m]) / rate(http_requests_total{job=~"gitlab.*"}[5m]) > 0.10
     for: 2m
     labels:
       severity: warning