[WIP] feat: support dynamic namespace discovery#2864

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Serializator wants to merge 19 commits intokubernetes:mainfrom

Serializator:ISSUE-2820-dynamic-namespaces

Commits on Apr 15, 2026

test: add unit tests for namespace discovery
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feat: implement dynamic namespace discovery
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refactor: apply filter on metrics store rather than reflector per namespace for performance
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test: read internal variables from discoverer with mutex to avoid race condition
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docs: add namespace label selector argument to CLI argument documentation
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fix: stop ticker before closing channel in PollForCacheUpdates
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fix: cast options.NamespaceList to []string and use consistent typing
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fix: typo idiomic instead of idiomatic
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fix: wrap original error in error logging
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test: assert configureNamespaceDiscovery does not return an error
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fix: use context.WithCancel to avoid informer goroutine leaks in tests
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refactor: replace time.Sleep with assert.Eventually in namespace discovery tests
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fix: reduce concurrent test iterations from 10000 to 1000
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fix: eliminate TOCTOU race in PollForCacheUpdates
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fix: validate NamespaceLabelSelector with labels.Parse
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