Implement MetricsCollector for Kubernetes Metrics Retrieval and Proce…

[see-quick]

…ssing

PR Description:

This PR introduces the MetricsCollector, a tool specifically designed for gathering and managing metrics from Kubernetes pods. It uses a flexible builder pattern that makes it straightforward to configure and adapt to various Kubernetes environments. The key features of this implementation include:

• Easy configuration options for setting the namespace, scraper pod, and metrics components.
• Flexible methods for either scheduled or on-demand metrics collection.
• Robust error handling to address scenarios like missing pods, incomplete data, or collection errors.

The PR also includes a suite of unit tests that simulate Kubernetes interactions using mock objects. These tests thoroughly check the setup and functionality of the metrics collection, ensuring the system is resilient and behaves as expected under various conditions.

Solves [1]

[1] - #29.

[kornys]

please also fix javadoc issues and rebase on latest main

[im-konge]

Thanks :)

[see-quick]

please also fix javadoc issues and rebase on latest main

fix javadoc and rebased

[see-quick]

btw I have also verified my implementation based on this PR [1] in operator repo works without any problem :)

[1] - https://github.com/strimzi/strimzi-kafka-operator/compare/main...see-quick:strimzi-kafka-operator:metrics-collector-test-frame-integration?expand=1

[see-quick]

Also, I was wondering if we want to add a system-level test in the test-frame-test module. But not sure if this PR should cover it

[kornys]

Also, I was wondering if we want to add a system-level test in the test-frame-test module. But not sure if this PR should cover it

I agree it can be done in separated PR later