Fix flaky test_trigger_log in triggerer job tests

[FrankYang0529]

test_trigger_log fails intermittently on CI. The test calls _service_subprocess(0.1) 30 times before checking stdout. The forked runner inherits the test's time.monotonic patch, so its watchdog logs nonstop ahead of the status lines. The supervisor reads at most 4096 bytes of runner logs per call. If the runner starts slowly, or the supervisor is briefly busy, the 30 calls run out before the status lines are read. Sample run:

• https://github.com/apache/airflow/actions/runs/34496070008/job/102941543949
• https://github.com/apache/airflow/actions/runs/33582219324/job/100101874765
• https://github.com/apache/airflow/actions/runs/32091435702/job/95577614679
• https://github.com/apache/airflow/actions/runs/28159425286/job/83403110039
• https://github.com/apache/airflow/actions/runs/28092166063/job/83174934542

This fix changes the call 30 calls to 300 like #70941.

• uv run --project airflow-core pytest airflow-core/tests/unit/jobs/test_triggerer_job.py

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Was generative AI tooling used to co-author this PR?

• Yes - Claude Code

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[aaron-y-chen]

Thanks!

[potiuk]

Hello @FrankYang0529 - thank you for your contributions to Apache Airflow!

The Airflow community has introduced a limit of 5 open pull requests at a time for contributors without write access to the repository. You currently have 30 open pull requests, so - as a one-time step of introducing the limit - we closed the ones where maintainers have not engaged yet:

• Avoid deactivating configured Dag bundles on transient get bundle errors #69698 - Avoid deactivating configured Dag bundles on transient get bundle errors
• Add gzip compression option for GCS remote task logs #71678 - Add gzip compression option for GCS remote task logs
• Fix comma-separated selected_fields in BigQuery to SQL transfers #71775 - Fix comma-separated selected_fields in BigQuery to SQL transfers
• Fix the API server silently ignoring its gunicorn worker hooks #71837 - Fix the API server silently ignoring its gunicorn worker hooks
• Fix docs omitting asset from the Dag discovery safe-mode heuristic #72027 - Fix docs omitting asset from the Dag discovery safe-mode heuristic
• Add missing Druid Ingest connection type #72104 - Add missing Druid Ingest connection type
• Fix scheduler crash when the Kafka event producer plugin is enabled #72138 - Fix scheduler crash when the Kafka event producer plugin is enabled
• Fix unscheduled tasks left on a stale Dag version #72153 - Fix unscheduled tasks left on a stale Dag version
• Make AzureBatchOperator batch_max_retries take effect #72317 - Make AzureBatchOperator batch_max_retries take effect
• Fix airflow.utils.context deprecation shim returning a module object #72593 - Fix airflow.utils.context deprecation shim returning a module object
• Support team-scoped secrets in LocalFilesystemBackend #72626 - Support team-scoped secrets in LocalFilesystemBackend
• Honour dag_ignore_file_syntax in Task SDK and example plugin loading #72802 - Honour dag_ignore_file_syntax in Task SDK and example plugin loading
• Restore CLI commands from custom executors and auth managers #72858 - Restore CLI commands from custom executors and auth managers
• Restore helpful error for unregistered priority weight strategies #72884 - Restore helpful error for unregistered priority weight strategies
• Fix flaky test_trigger_log in triggerer job tests #72919 - Fix flaky test_trigger_log in triggerer job tests
• Fix API server failing to start when [api] access_logfile is set #72920 - Fix API server failing to start when [api] access_logfile is set
• Fix missing task display name and map index in API audit logs #73020 - Fix missing task display name and map index in API audit logs
• Fail Gemini batch job operators when the job does not succeed #73029 - Fail Gemini batch job operators when the job does not succeed
• Fix extra Dag versions from template field callables if paths change #73031 - Fix extra Dag versions from template field callables if paths change
• Fix Dags staying blocked by max_active_runs until the next parse #73032 - Fix Dags staying blocked by max_active_runs until the next parse
• Reject async callables in @task.virtualenv and @task.external_python #73081 - Reject async callables in @task.virtualenv and @task.external_python
• Fix env var names in airflow config list for dotted and team sections #73136 - Fix env var names in airflow config list for dotted and team sections
• Fix OpenLineage jobDependencies run ID after upstream task is cleared #73247 - Fix OpenLineage jobDependencies run ID after upstream task is cleared
• Fix SFTPSensor skipping python_callable in deferrable mode #73312 - Fix SFTPSensor skipping python_callable in deferrable mode

These pull requests stay open because maintainers are already engaged in them - they count towards your limit:

• Add KafkaSharedStreamProducer and KafkaSharedStreamTrigger #68625 - Add KafkaSharedStreamProducer and KafkaSharedStreamTrigger
• Add rerun policy for rollups when an upstream partition is re-run #68778 - Add rerun policy for rollups when an upstream partition is re-run
• Replace AirflowException with ValueError in ProduceToTopicOperator #70351 - Replace AirflowException with ValueError in ProduceToTopicOperator
• Catch stale entries in the Java SDK dependency trust list #71869 - Catch stale entries in the Java SDK dependency trust list
• Support priority_weight in EdgeExecutor #72057 - Support priority_weight in EdgeExecutor
• Speed up the event logs API by loading only display names #73021 - Speed up the event logs API by loading only display names

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Drafted-by: Claude Code (Opus 5); reviewed by @potiuk before posting

[subhramit]

I have put one question in #73759 (comment), before this is merged, if we can stop the nonstop logging at the source rather than working around the symptom?

[FrankYang0529]

I have put one question in #73759 (comment), before this is merged, if we can stop the nonstop logging at the source rather than working around the symptom?

@subhramit Thanks for the suggestion. I reply in #73759.

[ColtenOuO]

LGTM.

[Andrushika]

LGTM. Hi @shahar1 could we merge this please? The same failure keeps crashing CI. Thanks!