feat(mastodon): Deploy SLO for Mastodon

apps/k8s01/mastodon/kustomization.yaml

@@ -5,5 +5,6 @@ resources:
   - ../../base/mastodon
   - certificate.yaml
   - mastodon-values.yaml
+  - slo.yaml
 patchesStrategicMerge:
   - database-override.yaml

apps/k8s01/mastodon/slo.yaml

+apiVersion: sloth.slok.dev/v1
+kind: PrometheusServiceLevel
+metadata:
+  name: requests-mastodon
+  namespace: mastodon
+spec:
+  service: "mastodon"
+  slos:
+    - name: "requests-availability"
+      objective: 98
+      description: "Mastodon SLO based on availability for HTTP request responses."
+      sli:
+        events:
+          errorQuery: sum(rate(nginx_ingress_controller_requests{exported_namespace="mastodon",ingress="nextcmastodonloud",status=~"(5..|429)"}[{{.window}}]))
+          totalQuery: sum(rate(nginx_ingress_controller_requests{exported_namespace="mastodon",ingress="mastodon"}[{{.window}}]))
+      alerting:
+        name: MastodonHighErrorRate
+        labels:
+          category: "availability"
+        annotations:
+          summary: "High error rate on 'mastodon' requests responses"