Add alert/RiskApplies

The alert is defined in a new
`PrometheusRule/cluster-version-operator-tech-preview`
which is installed only on a TechPreview cluster.

Author: hongkailiu

install/0000_90_cluster-version-operator_02_prometheusrule-TechPreviewNoUpgrade.yaml

@@ -0,0 +1,26 @@
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  labels:
+    k8s-app: cluster-version-operator
+  name: cluster-version-operator-tech-preview
+  namespace: openshift-cluster-version
+  annotations:
+    kubernetes.io/description: Alerting rules for when cluster-version operator metrics call for administrator attention.
+    exclude.release.openshift.io/internal-openshift-hosted: "true"
+    include.release.openshift.io/self-managed-high-availability: "true"
+    release.openshift.io/feature-set: TechPreviewNoUpgrade
+spec:
+  groups:
+  - name: cluster-version-tech-preview
+    rules:
+    - alert: RiskApplies
+      annotations:
+        summary: The cluster has been exposed to the conditional update risk for 10 minutes.
+        description: The conditional update risk {{ "{{ $labels.risk }}" }} applies to the cluster, and the cluster update to a version exposed to the risk is not recommended. For more information refer to 'oc adm upgrade'.
+        runbook_url: https://github.com/openshift/runbooks/blob/master/alerts/cluster-monitoring-operator/RiskApplies.md
+      expr: |
+        max by (namespace, name, risk) (cluster_version_risk_conditions{job="cluster-version-operator", name="version", condition="Applies"} == 1)
+      for: 10m
+      labels:
+        severity: warning