Merge "Add alert rules when OpenStack services are down" into main

charms/openstack-exporter-k8s/README.md

@@ -42,6 +42,15 @@ The charm by default uses following images:
 
     `ghcr.io/canonical/openstack-exporter:1.6.0-7533071`
 
+## Alerting Rules
+This charm automatically adds Prometheus alert rules using the files at
+`src/prometheus_alert_rules` when related with `grafana-agent`.
+The following alerts are configured by default:
+
+- `OpenStackServicesDown`: This alert rule will trigger when an OpenStack service is down. The
+exporter generates metrics that identify if services are up. E.g.: openstack_loadbalancer_up,
+openstack_designate_up. Individual alerts will appear if one of those services has problems.
+
 ## Contributing
 
 Please see the [Juju SDK docs](https://juju.is/docs/sdk) for guidelines
@@ -58,4 +67,3 @@ Please report bugs on [Launchpad][lp-bugs-charm-openstack-exporter-k8s].
 [juju-docs-actions]: https://jaas.ai/docs/actions
 [juju-docs-config-apps]: https://juju.is/docs/configuring-applications
 [lp-bugs-charm-openstack-exporter-k8s]: https://bugs.launchpad.net/charm-openstack-exporter-k8s/+filebug
-

charms/openstack-exporter-k8s/src/prometheus_alert_rules/general.yaml

@@ -0,0 +1,16 @@
+groups:
+- name: OpenStackServices
+  rules:
+    - alert: OpenStackServicesDown
+      expr: |
+        sum by(service) (
+          label_replace({__name__=~"openstack_(.+)_up"}, "service", "$1", "__name__", "openstack_(.+)_up")
+        ) == 0
+      for: 5m
+      labels:
+        severity: critical
+        service: "{{ $labels.service }}"
+      annotations:
+        summary: OpenStack Services Down
+        description: |
+          The OpenStack service {{ $labels.service }} is down