[kde] [Bug 500476] New: Bug Janitor Suggestion: Add comment if merge request description is edited with a new "BUG:" keyword

[Luke Horwell]

https://bugs.kde.org/show_bug.cgi?id=500476

            Bug ID: 500476
           Summary: Bug Janitor Suggestion: Add comment if merge request
                    description is edited with a new "BUG:" keyword
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: code at horwell.me
  Target Milestone: ---

SUMMARY

The bug janitor adds a comment "A possibly relevant merge request was started @
" when a merge request is opened with the "BUG:" keyword on a line. However, I
typically can't remember what is valid syntax for this to work ("BUG 123" or
"BUG: 123"? Does "Bug 123" work too?). In particular, by editing the MR
description, nothing happens.

I struggled to find any documentation or code
(https://invent.kde.org/sysadmin/bugzilla-bot) that directly uses this string,
so I'm not sure where/how it works. I'd guess it's some kind of webhook in
GitLab.

As a suggestion, please could:

* The documentation/wiki describe the optional keywords like "BUG:" or "CCBUG:"
when a creating a merge request that directly fixes a bug. Perhaps include
whether the janitor runs on a timer (e.g. every hour) or only at time of the MR
being opened.
* Add a mechanism/hook into GitLab so:
    - When a merge request description is edited, summon bot.
    - Bot reads Bugzilla comments. If "A possibly relevant..." comment was
found for bug, skip. Otherwise, add comment.


STEPS TO REPRODUCE
1. Open a merge request that fixes a bug, but don't add "BUG: XXX"
2. Edit the description in the merge request and add "BUG: XXXX" (XXX = bug
report number)

OBSERVED RESULT
Bug janitor doesn't inform the bug report. Developer unsure if janitor will
ever come back.

EXPECTED RESULT
Bug janitor posts "A possibly relevant merge request was started" if the
description is updated with new bug references.

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