Time Interval - Rules.yml -alert manager

[vamsi madhav]

My requirement is to check the expression three times before it send alert in slack or Email 

Current Config: 

In the below config, for:5m will send an alert if the memory usage is over 80% . But I want to check the expression vmware_vm_mem_usage_average / 100 >= 80 in loop which means when the Memory is over 80% the expression will counter first time and recheck with same expression for second time and again recheck third time and when the memory is still over 80% after three checks then the alert will start .

 

groups:

  - name: target

    rules:

      - alert: VirtualMachineMemoryWarning

        expr: vmware_vm_mem_usage_average / 100 >= 80

        for: 5m  

        labels:

          severity: warning

          team: devops

        annotations:

          summary: Virtual Machine Memory Warning (instance {{ $labels.instance }})

          description: High memory usage on {{ $labels.instance }}

[Stuart Clark]

What you are asking for is exactly what the "for" option does. It keeps periodically evaluating the expression and will only fire the alert if it constantly returns a result.

You can set how often those checks happen, so for example if they were every minute "for: 5m" means 5 evaluations all have to return the same time series to allow an alert to fire.

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