{{ $labels.instance }} is empty in rule execution

[Jhanssen Fávaro]

Hi folks,

I am brand new in prometheus world, and I have an understanding/basic question:

Why from a rule file I can not retrieve the {{  $labels.instance }} variable ?

Sample Kafka Alert:

    - alert: Under_Replicated_Partition_Count
      expr: sum(kafka_server_replicamanager_underreplicatedpartitions) by(env) > 0
      for: 1m
      labels:
        severity: critical
        oid: "1.3.6.1.4.1.XXXX.15.1.2.3.1"

        instance: "{{ $labels.service_name }}"

      annotations:
        summary: 'Kafka {{ $labels.service_name }}: {{ $value }} under replicated partitons'
        description: 'Under-replicated partitions means that one or more replicas are not available. This is usually because a broker is down.  Restart the broker, and check for errors in the logs.'

This bold line is same as anything... I've tried already in the annotation/description  section, also but no look..

Any ideas or how wold I managed to get this done ?

Best regards!

Jhanssen

[Jhanssen Fávaro]

Correction...

I meant:

        instance: "{{ $labels.instance}}"

[Brian Brazil]

On Wed, 21 Oct 2020 at 14:32, Jhanssen Fávaro <jhansse...@gmail.com> wrote:

Hi folks,

I am brand new in prometheus world, and I have an understanding/basic question:

Why from a rule file I can not retrieve the {{  $labels.instance }} variable ?

There is no instance label, as you aggregated it away with the sum(). If you want to have that label available you would mention it in the by clause, or use without and mention only the labels you wanted to remove.

Brian

 

Sample Kafka Alert:

    - alert: Under_Replicated_Partition_Count
      expr: sum(kafka_server_replicamanager_underreplicatedpartitions) by(env) > 0
      for: 1m
      labels:
        severity: critical
        oid: "1.3.6.1.4.1.XXXX.15.1.2.3.1"

        instance: "{{ $labels.service_name }}"

      annotations:
        summary: 'Kafka {{ $labels.service_name }}: {{ $value }} under replicated partitons'
        description: 'Under-replicated partitions means that one or more replicas are not available. This is usually because a broker is down.  Restart the broker, and check for errors in the logs.'

This bold line is same as anything... I've tried already in the annotation/description  section, also but no look..

Any ideas or how wold I managed to get this done ?

Best regards!

Jhanssen

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Brian Brazil

www.robustperception.io

[Jhanssen Fávaro]

Got it, thanks man. Already thought on this also, will try that.

Best Regards!