[TRTLLMINF-216][infra] use main as default target branch in L0_MergeRequest_PR

[weiminwang-nv]

Summary by CodeRabbit

• Bug Fixes
  • Merge request processing now defaults the target branch to main when no target branch is provided.
  • Downstream automation receives a consistent target branch value instead of an empty value.

Description

When L0_PostMerge is triggered without any parameters, such as manually run from the Jenkins web page or by a Jenkins cron trigger, the pipeline should use reasonable default parameters and run normally. However, the current default value of target_branch in the gitlabTriggerPhrase parameters is null. As a result, when the pipeline is triggered without no parameters, the target_branch used by the Merge Test Waive List stage is set to null, causing this stage to fail.

This PR changes the default value of target_branch in the gitlabTriggerPhrase parameters to main, so that L0_PostMerge can run normally when triggered without parameters.

Test Coverage

Before:

The “Merge Test Waive List” stage failed on fetch TOT waive list from Github:

With this PR:

We manually trigger a post-merge (via run with parameter menu in jenkins web console ) without multi-gpu tests, the result is same as the gitlab-push-webhook-triggered version

PR Checklist

Please review the following before submitting your PR:

• PR description clearly explains what and why. If using CodeRabbit's summary, please make sure it makes sense.

• PR Follows TRT-LLM CODING GUIDELINES to the best of your knowledge.

• Test cases are provided for new code paths (see test instructions)

• If PR introduces API changes, an appropriate PR label is added - either api-compatible or api-breaking. For api-breaking, include BREAKING in the PR title.

• Any new dependencies have been scanned for license and vulnerabilities

• CODEOWNERS updated if ownership changes

• Documentation updated as needed

• Update tava architecture diagram if there is a significant design change in PR.

• The reviewers assigned automatically/manually are appropriate for the PR.

• Please check this after reviewing the above items as appropriate for this PR.

GitHub Bot Help

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[weiminwang-nv]

/bot run

[tensorrt-cicd]

PR_Github #59648 [ run ] triggered by Bot. Commit: fefd881 Link to invocation

[coderabbitai]

📝 Walkthrough

Walkthrough

The merge request Jenkins pipeline now assigns main to globalVars[TARGET_BRANCH] when the bot-provided target branch is missing.

Changes

Merge request target branch

Layer / File(s)	Summary
Default TARGET_BRANCH initialization jenkins/L0_MergeRequest.groovy	The target branch fallback changes from null to main when gitlabParamsFromBot['target_branch'] is absent.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• NVIDIA/TensorRT-LLM#16397: Updates related target-branch handling in jenkins/L0_MergeRequest.groovy.

Suggested reviewers: zhanruisunch

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.
Title check	✅ Passed	The title matches the main change and includes a valid ticket and type.
Description check	✅ Passed	The description covers the issue, solution, test coverage, and checklist.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@jenkins/L0_MergeRequest.groovy`:
- Line 189: Update the TARGET_BRANCH assignment to use a null- and blank-safe
fallback to "main", ensuring absent, null, and empty target_branch values do not
propagate into globalVars or mergeWaiveList. Add coverage for all three input
cases while preserving the provided branch value when non-blank.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: e7b2e4f1-c896-4ab0-9913-ae29cef724cb

📥 Commits

Reviewing files that changed from the base of the PR and between 44f0521 and fefd881.

📒 Files selected for processing (1)

• jenkins/L0_MergeRequest.groovy

[tensorrt-cicd]

PR_Github #59648 [ run ] completed with state SUCCESS. Commit: fefd881
/LLM/main/L0_MergeRequest_PR pipeline #48083 completed with status: 'FAILURE'

CI Report

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

CI Agent Failure Analysis

Link to invocation

[ZhanruiSunCh]

LGTM

[weiminwang-nv]

/bot run

[tensorrt-cicd]

PR_Github #59922 [ run ] triggered by Bot. Commit: fefd881 Link to invocation

[tensorrt-cicd]

PR_Github #59922 [ run ] completed with state SUCCESS. Commit: fefd881
/LLM/main/L0_MergeRequest_PR pipeline #48324 completed with status: 'FAILURE'

CI Report

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

CI Agent Failure Analysis

Link to invocation

[weiminwang-nv]

/bot run

[tensorrt-cicd]

PR_Github #59938 [ run ] triggered by Bot. Commit: fefd881 Link to invocation

[tensorrt-cicd]

PR_Github #59938 [ run ] completed with state FAILURE. Commit: fefd881
/LLM/main/L0_MergeRequest_PR pipeline #48339 completed with status: 'FAILURE'

CI Report

⚠️ Action Required:

• Please check the failed tests and fix your PR
• If you cannot view the failures, ask the CI triggerer to share details
• Once fixed, request an NVIDIA team member to trigger CI again

CI Agent Failure Analysis

Link to invocation

[weiminwang-nv]

/bot skip --comment "The CI does not cover these changes and they were manually tested and verified. "

[tensorrt-cicd]

PR_Github #60300 [ skip ] triggered by Bot. Commit: fefd881 Link to invocation

[tensorrt-cicd]

PR_Github #60300 [ skip ] completed with state SUCCESS. Commit: fefd881
Skipping testing for commit fefd881

Link to invocation