Rename "metrics" port to "management" port

[toddbaert]

Currently, the "metrics" port configuration controls the port the HTTP readyz/healthz checks, gRPC health check, and metrics.

We should change the name to "management" port to make clear it exposes more than just metrics.

Relates to: #863

Be sure to update any related doc.

[Saurabhkr952]

I'd like to work on this. Changing "metrics" to "management" port makes sense given its broader functionality. I'm ready to implement the change and update the docs.
Please guide me on the next steps or any specific requirements for this contribution.

Thank you!

[toddbaert]

Thanks @Saurabhkr952 . Once #863 is merged, I think it should be a matter of:

• updating the viper config (use managementPort and fallback to metricsPort if managementPort is not defined), and add some kind of deprecation warning if possible
• update all mention of metrics port / metricsPort / etc in docs, and mention the deprecation above
• update code / config objects to use managementPort instead of metricsPort

I think that'll about cover it.

[agardnerIT]

Please also document this as a new page on the website (in /web-docs) as a Definition of done - so that this doesn't go out without documentation.

Saying that, I don't think we have documentation on this piece yet at all...

[craigpastro]

It seems that work on the issue has gotten a bit stale. Does anyone mind if I pick this task up? @Saurabhkr952?

[beeme1mr]

Hey @craigpastro, that would be great! I've reassigned the issue to you. Thank you 🙇

[craigpastro]

Thanks @beeme1mr! I'll try to get to it soon.