glib/docs/issue-and-merge-request-management.md
Philip Withnall 0c640f0130 docs: Document issue and merge request triaging and review guidelines
This documents the practices that I’ve been trying to follow for the
last few years for managing GLib issues and merge requests, and why they
seem to work well enough.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
2023-06-29 16:50:00 +01:00

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Issue and merge request management policy
===
Aims
---
* Finding duplicates and related issues and merge requests should be easy when
triaging new ones, or when looking back at the history of a particular piece
of code
* GLib co-maintainers and other interested people should be able to subscribe
to notifications for specific parts of GLib without receiving notifications
for all activity on GLib
* Issues and merge requests which are planned to be in a specific release
should not be accidentally left out of that release
* GLib co-maintainers should be able to easily see how much work is left to do
before a release is ready
* Users and developers should have some idea of whether an issue or merge
request is being actively worked on, the timescale for its completion, and
whos working on it
Issue triage
---
* Issues should be triaged shortly after they are filed. Triage should:
- Add labels to categorise the issue, even if its about to be closed (this
helps with finding related closed issues in future)
- Close them immediately if they are a duplicate of an existing issue
(`/duplicate #issue`)
- Or if they are out of scope, such as a user support question (which should
be on https://discourse.gnome.org)
- Ask the user for necessary debug information if the issue is valid, a bug,
and not enough information has been provided — extracting debug information
from users is often time-critical because they can only reproduce an issue
under certain conditions, or they lose interest and move on
- Assign the issue to an upcoming milestone if it seems urgent
* Note that triaging an issue does *not* commit the triager to working on the
issue
* If an issue is likely to affect a stable release (as well as the unstable
`main` branch), assign it to the next micro release milestone for that stable
release — the merge request for the fix will be assigned to the next `main`
micro release, and its backport to the next stable micro release
Merge request triage
---
* Merge requests should be triaged shortly after they are filed. Triage should
proceed as for issues, including labels and milestones
* The milestone for a merge request is the release it is intended to be
included in, and it should match the target branch of the merge request
- Its important to add milestones to merge requests, as they then show up on
the milestone page and highlight that the release is not yet ready until
theyre all merged
- This prevents releases accidentally being made without containing all the
fixes theyre supposed to
* The assignee of the merge request is the person who is working on it,
responding to review feedback
* The reviewer of the merge request is the GLib co-maintainer who is actively
reviewing it
* Dont assign someone else as the reviewer or assignee of a merge request
unless they have said they are willing to do it, otherwise it gives a false
impression that their time is allocated for doing the work
- You may assign someone else as a reviewer or assignee when closing or
merging a merge request, though, if that helps document who has done the
work so they can be appropriately attributed
Labelling issues and merge requests
---
GLib has a huge number of labels available, one per component of the library
plus several orthogonal labels. The use of labels allows for:
* Easy searching for related issues and duplicates, by filtering on label
* Co-maintainers of GLib to subscribe to issue and merge request notifications
for a set of labels limited to their interests, meaning they dont have to
subscribe to the full fire hydrant of GLib notifications just to maintain one
or two components
* High-level prioritization of work, such as prioritizing crashes over new
features
* Tracking issues and merge requests through the release lifecycle, so that
(for example) API additions can be done before the API freeze, and merge
requests approved during a code freeze can all be landed when the freeze ends
To subscribe to a specific label, go to
[the labels page](https://gitlab.gnome.org/GNOME/glib/-/labels) and use the
subscription selector next to the labels youre interested in.
Several labels are worth highlighting:
* Security: Time-critical security issues, which should typically be marked
as confidential.
* Merge After Freeze: Merge requests which have been accepted, but which cant
be merged yet as GLib is in
[code freeze](https://wiki.gnome.org/ReleasePlanning/Freezes). All MRs tagged
like this will be merged en-masse when the freeze ends.
* Needs Information: Issues which are blocked due to needing more information
from the reporter. These can be closed after 4 weeks if the reporter does not
respond.
* Not GNOME / Out of Scope: Issues which were closed due to not being within
the scope of GLib.
* Newcomers: Issues which are suitable for being taken on by newcomers to GLib.
When labelling an issue as such, please make sure that the issue title is
clear, and the description (or a comment) clearly explains what needs to be
done to fix the issue, to give newcomers the best chance of successfully
submitting a fix.
* Translation / I18N: Issues which relate to translatable strings or other
internationalization or localization problems. Adding this label may cause
the translation team to be looped into an issue or merge request.
* API deprecation: Issues or merge requests which deprecate GLib API, and hence
can only land in an unstable release outside an
[API freeze](https://wiki.gnome.org/ReleasePlanning/Freezes).
* New API: Issues or merge requests which add new GLib API, and hence can only
land in an unstable release outside an
[API freeze](https://wiki.gnome.org/ReleasePlanning/Freezes).
* Intermittent: Issues (such as test failures) which can only be reproduced
intermittently.
* Test failure: Issues which revolve around a unit test failing. Typically
these are opened after a CI run has failed, and are useful for tracking how
often a particular failure happens.
* Test missing: Merge requests which need a unit test to be written before they
can be merged.
Merge request review
---
* Assign yourself as the reviewer of a merge request when you start review;
this helps with tracking notifications, and lets the assignee of the merge
request know whether you are providing a comprehensive review or just some
drive-by comments
* Review the merge request at a high level first: is the change needed, does
it make sense, is it structured correctly; then look at the detail of memory
management, typos, etc.
- If a merge request is large or contains multiple unrelated changes, it is
best to ask the author to split it into multiple parallel merge requests.
This prevents review comments on one part of the merge request from blocking
merging the rest, and allows the reviewers time to be split into smaller
and more manageable chunks.
* Submit all your comments as a single review (rather than adding multiple
single comments) to avoid spamming subscribers with multiple notifications.
* CC in additional reviewers if their second opinion or domain expertise are
needed.
* Follow the review through multiple cycles of updates and re-review with an
aim to getting the merge request landed — a merge request which gets one
round of review and which is then forgotten about is as useful as a merge
request which gets no review at all.
* While it is useful to highlight related areas of the code needing work that
you spot while doing a review, it is not the responsibility of the author of
a merge request to fix things outside the scope of their merge request.
Reviews which increase the scope of work for a merge request make it much
less likely that the merge request will land quickly, which reduces the
effective usefulness of the contribution. This wears down contributors and
reviewers, as they dont see closure on what theyve put time into. It is
better to file additional issues for follow-up or related work.
* If you cannot follow through a merge request to completion, unassign yourself
as the reviewer to make this clear to everybody.
* Once a merge request lands, a backport might need to be created for the most
recent stable GLib branch (see the [backport policy](./backports.md). It is
the responsibility of the maintainers to do this, not the responsibility of
the merge request author.