Using variables in PrometheusRule expr field instead of contant values-CodePudding

I am trying to create a 'PrometheusRule' inside my cluster with some alert rules using promql expressions. However, I want these resources to be used and configurable for different services inside my same cluster. All I want to do is have Variable values inside my "expr" field, something like this:

expr: sum( nginx_ingress_controller_requests{status=~"5. "} ) > VARIABLE_VALUE

Instead of:

expr: sum( nginx_ingress_controller_requests{status=~"5. "} ) > 50

This is the PromethuesRule I am trying to make:

apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: blablaname
  namespace: blablans
spec:
  groups:
  - name: {{ include "blabla.fullname" . }}-cache
    rules:
    - alert: TOOMANY5XXX
      annotations:
        description: too many 5XXs
        summary: blablabla
      expr: sum( nginx_ingress_controller_requests{status=~"5. "} ) > VARIABLE_VALUE
      for: 5m
      labels:
        severity: critical

PS: I am using Helm charts as my package manager and would like the Variable to be present in my Values.yaml file

CodePudding user response：

If you are using helm then use simple variable assignment:

expr: sum( nginx_ingress_controller_requests{status=~"5. "} ) > {{ .Values.VariableValue }}