Contributors are still not notfied after a PR rollback

[bhack]

Contributors are still not notified when we are going to rollback PR merge.
Also in the case we have a linked issue to the PR it is not reopened or commented by the bot.

Contributors still thinks that their contributions was merged without any other notification.

Just an example:
tensorflow/tensorflow#57478

/cc @theadactyl @joanafilipa @learning-to-play @gbaned @mdanatg

[mihaimaruseac]

Seems to be caused by there being a PR being created to a wrong branch: tensorflow/tensorflow#57012

[mihaimaruseac]

Actually, here is the action that ran to create rollback PR:

https://github.com/tensorflow/tensorflow/actions/runs/2784555032

This is weird

Error: Unhandled error: HttpError: Validation Failed: {"value":"bhack","resource":"Issue","field":"assignees","code":"invalid"}

[mihaimaruseac]

Next time the action worked we got it finished successfully: tensorflow/tensorflow#56572 rollback caused tensorflow/tensorflow#57115

Action is https://github.com/tensorflow/tensorflow/actions/runs/2843891794

[bhack]

I didn't read the action source code but your last case seems different as it was not exactly a merge on the PR commit.

[bhack]

@mihaimaruseac I read the Action code and the log a bit but I cannot mention the author as the commits related to that Github Action contribution was masqueraded by the @tensorflower-gardener "anon user".

I guess that the difference between your example and mine is that assigning the ticket also to me, or other contributors, with my role/permission is going to create an error.

https://docs.github.com/en/issues/tracking-your-work-with-issues/assigning-issues-and-pull-requests-to-other-github-users

Probably we could add a preliminarily check for all the users involved if they could be assigned:
https://docs.github.com/en/rest/issues/assignees#check-if-a-user-can-be-assigned

If not they need to be mentioned /cc @<user> in the body of the ISSUE creation API request.

[bhack]

To summarize:

You can assign multiple people to each issue or pull request, including yourself, anyone who has commented on the issue or pull request, anyone with write permissions to the repository, and organization members with read permissions to the repository.

1. @mihaimaruseac Can you check if I still have read access to the TF repo?

2. More in general, for the "unknown team member" that contributed that Github Action, his assumption is wrong. PR author/owner cannot be considered automatically as assignee.

[mihaimaruseac]

Thanks for the debugging. I agree that we should probably do CC @user inside the body of the issue.

CC @learning-to-play to handle this

[bhack]

Just a note.

Point 1. was caused by a permission incident we had also on my account. Now the action runned fine:
https://github.com/tensorflow/tensorflow/runs/8075237000?check_suite_focus=true

Point 2. It is a bug so it still need to be fixed as not all PR submitters are team members.

[bhack]

Please note that also PR reviewers are not notified on the rollback:

tensorflow/tensorflow#58332 (comment)

[bhack]

The rollback doesn't reopen the connected ticket:

tensorflow/tensorflow#59076

[mihaimaruseac]

It needs to go through multiple hops to get that information, the best compromise was to create a new issue in which to tag reviewer and PR author

[bhack]

We need to notify the PR approver:
tensorflow/tensorflow#59078