chore(source): standardize sources

[ivankatliarchuk]

What does it do ?

This PR standardizes controller mismatch checking and empty endpoint logging across all source implementations by extracting duplicated logic into reusable helper functions.

New helper functions

1. endpoint.HasEmptyEndpoints() (file created endpoint/utils.go similar to source/utils.go)
   - Checks if endpoint list is empty and logs a standardized debug message
   - Returns true if empty, false otherwise
2. annotations.IsControllerMismatch() (source/annotations/processors.go)
   - Checks if a resource should be skipped due to controller annotation not matching
   - Logs a standardized debug message when skipping

Motivation

• DRY principle: Each source had nearly identical code for checking controller annotations and logging empty endpoints. This was duplicated 12+ times.
• Consistent logging: All sources now use the same log message format, making debugging easier.
• Maintainability: Bug fixes or log format changes only need to happen in one place.
• Type safety: Sources now use typed constants from source/types package instead of hardcoded strings for resource types.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[coveralls]

Pull Request Test Coverage Report for Build 21064023875

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 703 unchanged lines in 26 files lost coverage.
• Overall coverage increased (+0.2%) to 79.056%

---

Files with Coverage Reduction	New Missed Lines	%
utils.go	1	98.0%
fqdn/fqdn.go	1	98.63%
informers/informers.go	2	90.0%
annotations/processors.go	2	97.26%
endpoints.go	2	96.92%
v1alpha1/groupversion_info.go	3	0.0%
pod.go	6	95.54%
node.go	12	90.24%
events/types.go	13	90.85%
ingress.go	14	88.48%

Totals
Change from base Build 20810601084:	0.2%
Covered Lines:	16038
Relevant Lines:	20287

---

💛 - Coveralls

[vflaux]

/lgtm

[ivankatliarchuk]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ivankatliarchuk

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Details

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• OWNERS [ivankatliarchuk]

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