tests: runtime: Try to eliminate flakyness on CI load

[cosmo0920]

To stabilize testing work load of out_lib, we might have to use batch style of ingesting 100 records.

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Testing
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Summary by CodeRabbit

• Tests
  • Optimized test execution for the max_records validation by batching input data into a single aggregated payload instead of multiple individual pushes.

[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: 0f25ce14-4a66-4b34-b7fe-58b392dd01a8

📥 Commits

Reviewing files that changed from the base of the PR and between 0481348 and cc5039c.

📒 Files selected for processing (1)

• tests/runtime/out_lib.c

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📝 Walkthrough

Walkthrough

In tests/runtime/out_lib.c, the test_max_records test is updated to send 100 records as a single aggregated buffer. Instead of calling flb_lib_push 100 times in a loop, it now allocates one contiguous buffer, fills it with 100 copies of input_json via memcpy, calls flb_lib_push once, and frees the buffer.

Changes

test_max_records single-buffer push

Layer / File(s)	Summary
Aggregated buffer variables and push logic tests/runtime/out_lib.c	Adds input_buffer, input_records (100), and input_size variables; replaces the per-record flb_lib_push loop with a single allocation, memcpy-based population, one flb_lib_push call, and a subsequent free.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• fluent/fluent-bit#11888: Modifies the same test_max_records() function in tests/runtime/out_lib.c, stabilizing its waiting and timeout logic.

Suggested reviewers

• edsiper

Poem

🐇 One hop, one push, no need to loop,
A hundred records fit in one scoop!
memcpy fills the buffer with care,
Then flb_lib_push sends them all through the air.
Less calls, same test — the rabbit approves! 🌟

🚥 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 directly addresses the main change: improving CI stability for the out_lib test by optimizing record ingestion from 100 separate pushes to a single batch operation.
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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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cosmo0920-stabilize-out_lib-test-2nd-attempt

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