feat(nextcloud): Add basic SLO for nextcloud

apps/k8s01/nextcloud/kustomization.yaml

@@ -5,6 +5,7 @@ resources:
   - ../../base/nextcloud
   - certificate.yaml
   - nextcloud-values.yaml
+  - slo.yaml
   - ../../../shared/resourcequotas/default.yaml
 patchesStrategicMerge:
   - database-override.yaml

apps/k8s01/nextcloud/slo.yaml

+apiVersion: sloth.slok.dev/v1
+kind: PrometheusServiceLevel
+metadata:
+  name: requests-nextcloud
+  namespace: nextcloud
+spec:
+  service: "nextcloud"
+  slos:
+    - name: "requests-availability"
+      objective: 95
+      description: "Nextcloud SLO based on availability for HTTP request responses."
+      sli:
+        events:
+          errorQuery: sum(rate(nginx_ingress_controller_requests{exported_namespace="nextcloud",ingress="nextcloud",status=~"(5..|429)"}[{{.window}}]))
+          totalQuery: sum(rate(nginx_ingress_controller_requests{exported_namespace="nextcloud",ingress="nextcloud"}[{{.window}}]))
+      alerting:
+        name: MatrixHighErrorRate
+        labels:
+          category: "availability"
+        annotations:
+          summary: "High error rate on 'nextcloud' requests responses"