ci(prow): migrate pingcap/tiflash release-7.1 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-7.1-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 updates the prow-jobs/pingcap/tiflash/release-7.1-presubmits.yaml file to migrate specific Jenkins agent jobs from one Jenkins instance to another by changing the labels.master value from "1" to "0". The change is minimal and targeted, focusing only on flipping the labels to redirect job scheduling. The implementation is straightforward and clear.

---

Code Improvements

• Clarify the meaning of the master label and its values

  • File: prow-jobs/pingcap/tiflash/release-7.1-presubmits.yaml (lines 11 and 24)
  • Issue: The label key master with values "1" or "0" is not self-explanatory. It's unclear what "0" or "1" signify without external context, which could cause confusion for future maintainers.
  • Suggestion: Add a comment above the labels section explaining the significance of the master label and what "0" and "1" represent, for example:

    # 'master' label controls Jenkins instance routing: "1" for old Jenkins, "0" for target Jenkins.
    labels:
      master: "0"

• Consider use of constants or variables for label values

  • File: prow-jobs/pingcap/tiflash/release-7.1-presubmits.yaml
  • Issue: Hardcoding "0" and "1" is error-prone and not descriptive. Using a named constant or variable for the label values would improve readability and maintainability.
  • Suggestion: If the prow job YAML supports anchors or variables, define the label values with meaningful names, e.g.:

    labels:
      master: &jenkins_target "0"

    Then reference *jenkins_target where needed.

---

Best Practices

• Add a changelog or migration note

  • File: PR description or a suitable documentation file
  • Issue: Since this PR affects CI job routing for a release branch, documenting this migration in a changelog or internal migration guide would help other developers and operators track this change and avoid confusion if jobs stop running as expected.
  • Suggestion: Add a brief note in the PR description or a dedicated docs file about why this change was made and what downstream effects to expect.

• Testing and validation

  • File: N/A (YAML configuration)
  • Issue: It's not obvious if this label flip has been validated to correctly schedule jobs on the new Jenkins instance.
  • Suggestion: Ensure CI job triggers have been tested on the target Jenkins. Add a note in the PR description confirming that jobs run successfully post-migration or reference a test plan.

---

No critical issues or broken functionality identified given this limited scope change. Overall, the PR is clean and focused but would benefit from improved documentation and clarity on label semantics.

[ti-chi-bot]

Jenkins Migration Verification

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

• pingcap/tiflash/release-7.1/pull_unit_test
  • status: skipped
• pingcap/tiflash/release-7.1/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 migrates the pingcap/tiflash/release-7.1 presubmit jobs from the current Prow environment to a target Jenkins instance by flipping the label master from "1" to "0" in the job definitions within release-7.1-presubmits.yaml. The change is minimal and focused, correctly scoped to only update the agent labels. Overall, the modification is straightforward and low risk, but it could benefit from some additional context and verification steps.

---

Code Improvements:

• Lack of explanation for label change meaning and impact

  • File: prow-jobs/pingcap/tiflash/release-7.1-presubmits.yaml (lines 10, 23)
  • Issue: The label change from "1" to "0" for master is not documented in the YAML or PR description beyond a brief note. This may cause confusion for future maintainers unfamiliar with the label semantics and the scheduling mechanism.
  • Suggestion: Add a comment in the YAML near the label or in the PR description explaining what the label master controls (e.g., scheduling target Jenkins instance) and why flipping it from "1" to "0" migrates the jobs. For example:

    labels:
      # master: "0" means schedule on the new Jenkins agent; "1" is the old Jenkins.
      master: "0"

• No validation or smoke test steps mentioned

  • File: PR description / accompanying docs
  • Issue: The PR does not mention if the migrated jobs were tested or validated on the target Jenkins environment to ensure they function as expected after the label flip.
  • Suggestion: Include verification steps or references to test runs demonstrating that the jobs are correctly triggered and executed on the new Jenkins instance.

---

Best Practices:

• PR description clarity and linkage

  • File: PR description
  • Issue: The description references related issues (#4962, #4947, #4942) but does not clarify their relevance or how this PR fits into the overall migration plan.
  • Suggestion: Briefly summarize the relation to those issues and what the next steps are after this migration step completes. This helps reviewers and future readers understand the broader context.

• Comment consistency about decorate field

  • File: release-7.1-presubmits.yaml lines 13, 26
  • Issue: The inline comment # need add this. after decorate: false is a bit unclear and grammatically awkward.
  • Suggestion: Rephrase the comment for clarity, for example:

    decorate: false # required for Jenkins agent jobs

---

No critical issues or broken functionality are apparent given the minimal nature of the change. The main improvements are enhancing documentation and verification for maintainability and operational confidence.

[wuhuizuo]

/retest

[wuhuizuo]

/approve

[wuhuizuo]

/approve

[ti-chi-bot]

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