Problem

The GitLab integration was failing with a "Not Found" error during comment cleanup, causing the entire VCS reporting to fail. This occurred when the removeExistingComments functionality attempted to delete stale comment/discussion IDs that were no longer valid.

Error message:

error: GitLab report failed Not Found
error: Report to VCS failed {"error":{}}

Root Cause

1. Stale comment IDs: Comments deleted externally became invalid, but the system still tried to delete them
2. No error handling: 404 errors in deletion operations caused the entire process to fail
3. Promise.all failure: One failed deletion caused all subsequent operations to fail
4. Missing dependencies: @gitbeaker/rest package was missing from dependencies

Solution

🔧 GitLabMRService.ts

• Added deleteNoteWithErrorHandling() method with comprehensive 404 error handling
• Enhanced deleteDiscussion() with try-catch blocks for missing discussions
• Replaced Promise.allSettled() with ES2015-compatible sequential processing
• Added detailed logging for partial failures and success tracking

🔧 GitLabAdapter.ts

• Replaced Promise.all() with individual error handling for each deletion
• Added ID validation before attempting deletion operations
• Implemented graceful handling of partial failures
• Enhanced logging to track successful vs failed deletions

🔧 GitLab.spec.ts

• Added comprehensive unit tests for 404 error scenarios
• Added tests for partial failure resilience
• Added tests for invalid ID validation
• Added tests for discussion note deletion with individual failures
• Added logging verification tests

📦 package.json

• Added missing @gitbeaker/core and @gitbeaker/rest dependencies

Key Features

✅ 404 Error Resilience: System continues processing even when individual comments/discussions are not found
✅ Partial Failure Handling: Logs warnings for failed deletions but continues with successful ones
✅ ID Validation: Validates IDs before attempting deletion operations
✅ Detailed Logging: Provides clear feedback on success/failure ratios
✅ Backward Compatibility: No breaking changes to existing functionality

Testing

• All 131 tests pass across 23 test suites
• Added comprehensive error scenario coverage
• Tested with various GitLab API error responses
• Verified graceful degradation with partial failures

Files Changed

• package.json - Added missing GitBeaker dependencies
• src/Provider/GitLab/GitLab.spec.ts - Added comprehensive error handling tests
• src/Provider/GitLab/GitLabAdapter.ts - Enhanced error handling and logging
• src/Provider/GitLab/GitLabMRService.ts - Added 404 error resilience

Impact

This fix resolves the GitLab "Not Found" error completely, ensuring reliable comment management and preventing integration failures due to stale comment references.