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monitoring: exclude catchall-error-pages from HighService4xxRate

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The catchall-error-pages IngressRoute matches HostRegexp(^(.+\.)?
viktorbarzin\.me$) at priority=1 — it's the wildcard handler that
returns 404 for any unmatched hostname (typos + scanner traffic).
By design its 4xx rate sits at ~100%, so HighService4xxRate was a
permanent false positive for traefik-catchall-error-pages-*@kubernetescrd.

Same exclusion pattern as nextcloud/grafana/linkwarden/claude-memory
(services with legitimately high 4xx counts).
This commit is contained in:
Viktor Barzin 2026-05-27 19:46:18 +00:00
parent f677794379
commit fc5a4b66ad
1 changed files with 8 additions and 3 deletions
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11
stacks/monitoring/modules/monitoring/prometheus_chart_values.tpl
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@ -2141,13 +2141,18 @@ serverFiles:
annotations:
summary: "5xx rate on {{ $labels.service }}: {{ $value | printf \"%.1f\" }}% (threshold: 10%)"
- alert: HighService4xxRate
# `.*catchall-error-pages.*` is excluded because that IngressRoute
# is the wildcard `HostRegexp(^(.+\.)?viktorbarzin\.me$)` handler
# — its entire purpose is to return 404 for unmatched hostnames
# (typos + scanner traffic), so its 4xx rate is permanently ~100%.
# Without this exclusion the alert is a perpetual false positive.
expr: |
(
sum(rate(traefik_service_requests_total{code=~"4..", service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*"}[5m])) by (service)
/ sum(rate(traefik_service_requests_total{service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*"}[5m])) by (service)
sum(rate(traefik_service_requests_total{code=~"4..", service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*|.*catchall-error-pages.*"}[5m])) by (service)
/ sum(rate(traefik_service_requests_total{service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*|.*catchall-error-pages.*"}[5m])) by (service)
* 100
) > 30
and sum(rate(traefik_service_requests_total{service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*"}[5m])) by (service) > 0.1
and sum(rate(traefik_service_requests_total{service!~".*nextcloud.*|.*grafana.*|.*linkwarden.*|.*claude-memory.*|.*catchall-error-pages.*"}[5m])) by (service) > 0.1
and on() (time() - process_start_time_seconds{job="prometheus"}) > 900
for: 15m
labels: