Support ruok command in zookeeper receiver

[akats7]

Component(s)

receiver/zookeeper

Is your feature request related to a problem? Please describe.

Other zookeeper agents (e.g., datadog) support the ruok command along with the metric set from mntr, I wanted to inquire regarding adding a scraper to get the ruok response, and potentially adding it as an attribute as it likely doesn't belong in a metric table as a standalone.

Describe the solution you'd like

We would like the ruok response to be scraped along with the mntr metric set.

Describe alternatives you've considered

No response

Additional context

No response

[github-actions]

Pinging code owners:

• receiver/zookeeper: @djaglowski

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[akats7]

Hi @djaglowski, wanted to follow up

[djaglowski]

Hi @akats7. Thanks for the proposal.

Am I correct in understanding that this command is essentially a boolean health check? If so, my suggestion would be to model this as an uptime metric. Here are several examples. What do you think about this approach?

Otherwise, can you clarify where you would add this as an attribute?

[akats7]

Hey @djaglowski, thanks for the quick response.

Yep it is a boolean health check, after looking at the example set you sent, I stumbled upon a mongodb health metric (here) that seems to be a analogous to what we're trying to see with zookeeper. It's of kind gauge with a numeric 1 or 0 to represent health. I think this would be a good fit.

[djaglowski]

@akats7, that makes sense. Sounds good to me.

[akats7]

Hey @djaglowski, the zookeeper server closes the socket after running each command, so to run the ruok command in the same scraper, we have to use multiple connections. I wanted to run it by you before I update the existing tests.

I'll open and link a preliminary PR.