in_kubernetes_events: log missed payload on level warn instead of debug

[MarcWort]

While #11252 was closed incorrectly by stale-bot, and #11268 has had no recent activity, users should at least be warned about missed kubernetes events by logging them at warning level instead of debug level.

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Testing
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Documentation

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Backporting

• Backport to latest stable release.

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

• Bug Fixes
  • Parsing failures for JSON event payloads now surface as warnings instead of debug messages, making malformed or incomplete payload issues easier to notice during operation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f0179f17-ca4a-41c8-906f-5113d6a1dbd0

📥 Commits

Reviewing files that changed from the base of the PR and between b81c252 and 4fb42dd.

📒 Files selected for processing (1)

• plugins/in_kubernetes_events/kubernetes_events.c

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📝 Walkthrough

Walkthrough

In process_http_chunk, the log call for a failed flb_pack_json result is changed from flb_plg_debug to flb_plg_warn, keeping the same "incomplete or bad formed JSON" message and payload argument.

Changes

Log severity upgrade

Layer / File(s)	Summary
Warn on malformed JSON payload plugins/in_kubernetes_events/kubernetes_events.c	Log level for the "could not process payload, incomplete or bad formed JSON" message in process_http_chunk is changed from flb_plg_debug to flb_plg_warn.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A bunny hopped through JSON land,
Found broken brackets, took a stand.
"No more silence!" cried the hare,
"A warning now shall fill the air!"
🐇 Bad JSON shall hide no more~

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the change from debug to warning logging for missed Kubernetes event payloads.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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