ISSUE-20146: Add support to include the broker healthCheck status in the broker metrics.

[sijie]

Original Issue: apache#20146

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• I searched in the issues and found nothing similar.

Motivation

Broker metrics don't have anything to indicate health of the broker (to indicate if broker is active). In Prometheus broker metrics which are used for monitoring, it will be useful if metrics also show the broker health. Prometheus can automatically scrape the broker state and can be used for monitoring purposes. So, add support to include the broker active status in the broker metrics.

Ex:

URL: http://localhost:8080/metrics
:
1 shows broker is active, 0 is inactive, -1 unknown
pulsar_health 1

Solution

Allow periodic task to capture broker's health state and report to metrics, it should be controlled by config and by default it will be disabled.

Alternatives

No response

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!