Add libvirtd_exporter prometheusrule

To check if qemu and libvirtd versions are same

Change-Id: I54d7a18f690109cf5c39bce22aee7899b3035a02

openstack_operator/libvirtd_exporter.py

@@ -32,3 +32,4 @@ def create_or_resume(spec, **_):
     utils.create_or_update('libvirtd_exporter/daemonset.yml.j2',
                            spec=spec)
     utils.create_or_update('libvirtd_exporter/podmonitor.yml.j2')
+    utils.create_or_update('libvirtd_exporter/prometheusrule.yml.j2')

openstack_operator/templates/libvirtd_exporter/prometheusrule.yml.j2

@@ -0,0 +1,32 @@
+---
+# Copyright 2020 VEXXHOST, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: libvirtd-alertrule
+  labels:
+    {{ labels("libvirtd-exporter", "libvirtd-exporter") | indent(4) }}
+spec:
+  groups:
+  - name: libvirtd
+    rules:
+    - alert: VirtualizationDriverMismatch
+      for: 15m
+      expr: |
+        count(libvirtd_info) by (version, driver, driver_version) != 1
+      annotations:
+        priority: P4
+        description: QEMU and libvirt versions are not matching in the cloud.