Cluster v0.6.0 upgrade fails due to invalid PrometheusRules

[tw-sematell]

Hi everyone!
Just tried to update my charts and it failed due to the Prometheus Rule admission:
Error: UPGRADE FAILED: failed to create resource: admission webhook "prometheusrulevalidate.monitoring.coreos.com" denied the request: Rules are not valid

In more detail, extracting the generated yaml and application by hand yields:
`The "prometheusrules" is invalid:

• : 72:11: group "cloudnative-pg/timescaledb-cluster", rule 5, "CNPGClusterLogicalReplicationErrorsCritical": could not parse expression: 1:147: parse error: ranges only allowed for vector selectors
• : 87:11: group "cloudnative-pg/timescaledb-cluster", rule 6, "CNPGClusterLogicalReplicationErrors": could not parse expression: 1:147: parse error: ranges only allowed for vector selectors
• : 153:11: group "cloudnative-pg/timescaledb-cluster", rule 9, "CNPGClusterLogicalReplicationStoppedCritical": could not parse expression: 7:125: parse error: binary expression must contain only scalar and instant vector types
• : 176:11: group "cloudnative-pg/timescaledb-cluster", rule 10, "CNPGClusterLogicalReplicationStopped": could not parse expression: 7:125: parse error: binary expression must contain only scalar and instant vector types`

Prometheus v3.10 is running btw.

[sakowicz]

    monitoring:
      enabled: true
      prometheusRule:
        excludeRules:
          - CNPGClusterLogicalReplicationErrorsCritical
          - CNPGClusterLogicalReplicationErrors
          - CNPGClusterLogicalReplicationStoppedCritical
          - CNPGClusterLogicalReplicationStopped

Temporary work around to mute the alerts until the fix is ready.

[tw-sematell]

I just checked in my previous deployments: these rules are new anyhow, so there is no loss at least.

[pschichtel]

I'm applying this kustomization to the chart output to fix this:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization
patches:
# workaround for: https://github.com/cloudnative-pg/charts/issues/825
- target:
    group: monitoring.coreos.com
    version: v1
    kind: PrometheusRule
    name: cluster-name-alert-rules
  patch: |-
    - op: remove
      path: /spec/groups/0/rules/11
    - op: remove
      path: /spec/groups/0/rules/10
    - op: remove
      path: /spec/groups/0/rules/7
    - op: remove
      path: /spec/groups/0/rules/6