[improve][pip] PIP-323: Complete Backlog Quota Telemetry

[asafm]

Motivation

PIP-323 is introduced to fill the gap of backlog quota telemetry. It allows the user to know when a time-based backlog quota is about to exceed, and how many times it exceeded. It also adds backlog quota check duration metric allowing the user to configure the interval for that check based on data. Once this is implemented, the user can finally create and alert to know when a certain topic is about to exceed its defined backlog quota limit, alert on it, and using topic stats Admin API to grab the subscription name causing it.

Modifications

Adding PIP-323

Verifying this change

• Make sure that the change passes the CI checks.

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

If the box was checked, please highlight the changes

• Dependencies (add or upgrade a dependency)
• The public API
• The schema
• The default values of configurations
• The threading model
• The binary protocol
• The REST endpoints
• The admin CLI options
• The metrics
• Anything that affects deployment

Documentation

• doc
• doc-required
• doc-not-needed
• doc-complete

[asafm]

This PIP is based on #19601

[codelipenghui]

It's a nice proposal with a clear background, and easy to read.
Just left a few minor comments

[yuweisung]

Look good to me.
Thanks for this pip.

[Technoboy-]

File name should be pip-323

[asafm]

File name should be pip-323

@Technoboy- What am I missing?

[Technoboy-]

File name should be pip-323

@Technoboy- What am I missing?

Ah, sorry.

[Technoboy-]

Need to update the vote thread

[asafm]

@Technoboy- Can you please merge this? The PIP vote approved it.