installation: whats-new: document Protobuf, GCS and syslog additions

[eschabell]

 - Extend the Kafka Schema Registry entry beyond Avro: format protobuf
    resolves its schema from a registry and needs FLB_PROTOBUF_ENCODER
  - Note the GCS size trigger, so the entry covers both upload_timeout
    and total_file_size
  - Add an entry for RFC 6587 octet counting framing in the syslog
    output, selected with syslog_framing

Summary by CodeRabbit

• Documentation
  • Clarified that Google Cloud Storage uploads occur when upload_timeout elapses or buffered data for a tag reaches the configured total file size.
  • Documented Avro serialization for Kafka Schema Registry using format: avro, including the required build support.
  • Added Syslog documentation for RFC 6587 octet-counting framing in TCP and TLS modes.

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📝 Walkthrough

Walkthrough

The Fluent Bit v5 release notes document Google Cloud Storage upload triggers, Kafka Avro serialization requirements, and Syslog RFC 6587 octet-counting framing.

Changes

Output documentation

Layer / File(s)	Summary
Output release-note updates installation/whats-new-in-fluent-bit-v5.md	The Google Cloud Storage description adds upload_timeout and total_file_size triggers. The Kafka description adds Avro serialization and the FLB_AVRO_ENCODER requirement. A Syslog subsection documents octet_counting framing for tcp and tls modes.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the documentation update and names the three main additions: Protobuf, GCS, and syslog.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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[eschabell]

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Actionable comments posted: 2

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In `@installation/whats-new-in-fluent-bit-v5.md`:
- Line 69: Update the Kafka release note to describe only Avro Schema Registry
resolution: remove the Protobuf format and registry claims, state that format
must be avro, and reference the FLB_AVRO_ENCODER build requirement while
preserving the existing schema_registry_url and build-and-install links.
- Around line 65-81: Update the GCS and Syslog output documentation option
tables to include all referenced parameters: document total_file_size and its
interaction with upload_timeout in the GCS page, and document syslog_framing
with the octet_counting value and its tcp/tls restriction in the Syslog page.

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[eschabell]

@patrick-stephens ready for review!