ci(prow): migrate pingcap/tiflash release-8.1 jobs to target jenkins

[wuhuizuo]

Part of #4962.

Summary

Flip labels.master "1" -> "0" for the jenkins-agent jobs in prow-jobs/pingcap/tiflash/release-8.1-presubmits.yaml so they are scheduled on the to Jenkins.

Part of #4947 / #4942

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Summary
This PR modifies the Prow job configuration for pingcap/tiflash release-8.1 presubmits by flipping the labels.master value from "1" to "0" for Jenkins agent jobs. This change reroutes these jobs to a different Jenkins instance as part of migrating toward a target Jenkins environment. The change is straightforward, limited in scope, and follows the intended migration approach, with no apparent syntax or structural issues.

---

Code Improvements

• Clarify the meaning of labels.master values

  • File: prow-jobs/pingcap/tiflash/release-8.1-presubmits.yaml lines ~11 and 24
  • Issue: The significance of "1" vs "0" for labels.master is not self-evident in the YAML file. This could confuse future maintainers or reviewers.
  • Suggestion: Add a brief comment explaining what "master: "0" means in this context, e.g.:

    labels:
      master: "0" # '0' indicates scheduling on the target Jenkins instance (migration target)

  This improves maintainability and clarity.

• Verify that all Jenkins agent jobs have been updated consistently

  • The PR changes two jobs. Confirm that there are no other Jenkins jobs under this release branch that require similar label flips, to avoid inconsistent routing.

---

Best Practices

• Add a note in the PR description or commit message about rollout/testing

  • Since this change affects CI job scheduling, consider documenting or linking to instructions on how to validate the new Jenkins routing works correctly. This helps reviewers and future engineers understand operational impact.

• Consider adding test coverage or verification steps

  • While this is a config-only change, if there are integration tests or dry runs that verify job scheduling, mention those to ensure the change does not break CI workflows.

---

No critical issues or bugs were found in the diff provided. The PR is concise and focused on a single migration configuration change. Adding clarifying comments and ensuring operational readiness documentation will improve the change's quality and maintainability.

[ti-chi-bot]

Jenkins Migration Verification

Migrating jenkins-agent Prow jobs to the to Jenkins (labels.master: 1 -> 0).

• pingcap/tiflash/release-8.1/pull_unit_test
  • status: skipped
• pingcap/tiflash/release-8.1/pull_integration_test
  • status: skipped

Summary: success=0 submitted=0 failed=0 infra-fail=0 skipped=2 dry-run=0 total=2

[ti-chi-bot]

I have already done a preliminary review for you, and I hope to help you do a better job.

Summary
This PR updates the release-8.1-presubmits.yaml configuration for pingcap/tiflash presubmit jobs by flipping the labels.master value from "1" to "0" on Jenkins agent jobs. This change redirects the job scheduling from the old Jenkins to the target Jenkins as part of a migration effort. The change is minimal and straightforward, with no apparent syntax or structural issues.

---

Code Improvements

• Clarify the meaning and impact of labels.master:

  • File: prow-jobs/pingcap/tiflash/release-8.1-presubmits.yaml (lines ~11 and ~24)
  • Issue: It is unclear what the master label controls and why flipping from "1" to "0" achieves the migration. This can confuse future maintainers.
  • Suggestion: Add a brief comment above the labels.master setting explaining its purpose, e.g.:

    # 'master' label controls scheduling on Jenkins clusters: "1" for old Jenkins, "0" for target Jenkins

    This will clarify the intention behind the label flip.

• Confirm consistency across related job configurations:

  • File: prow-jobs/pingcap/tiflash/release-8.1-presubmits.yaml
  • Issue: Only two jobs are modified here. Are there other related jobs or postsubmit jobs that also need this update for consistency?
  • Suggestion: Double-check and update all relevant jobs in this and related files to avoid partial migration and inconsistent job scheduling.

---

Best Practices

• Add a changelog or migration note:

  • File: PR description and possibly a docs or CHANGELOG.md file
  • Issue: The PR description references issue numbers but lacks a summary of the impact on users or developers.
  • Suggestion: Include a short note describing the user-facing effect of this migration, e.g., "Presubmit jobs for release-8.1 are now executed on the target Jenkins cluster instead of the legacy one."

• Test coverage or validation steps:

  • File: N/A (configuration file)
  • Issue: No mention of how this change was validated or tested.
  • Suggestion: Add a note in the PR description or commit message describing how you verified that jobs are correctly scheduled on the new Jenkins target after this label change.

---

No critical issues detected given the minor nature of this label flip. The PR is clear but would benefit from improved documentation and verification notes for maintainability.

[wuhuizuo]

/retest

[wuhuizuo]

/approve

[wuhuizuo]

/approve

[ti-chi-bot]

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