Resolve "Support Regular Expression In Prometheus Target Checks"

General MR

Summary

Adds support of passing in a Regular Expression when matching the Prometheus targets expected up pods.

Using a grouping, we verify that if x pods are running in the cluster , then only x/x up will match the regex.

This also accepts a plain text match string as currently implemented. So, it should provide backward compatibility.

A sample of this working in the Monitoring package can be found here: monitoring!393 (merged)

Also tested this on a local k8s cluster with Big Bang umbrella chart to verify the tests work as expected with a different number of pods.

Linked Issue

Issue #55 (closed)

Upgrade Notices

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