Yep it's very user: friendly. :)

This seems to be due to 
https://chromium.googlesource.com/infra/luci/luci-py/+/master/appengine/swarming/server/task_request.py#780

Which calls to https://chromium.googlesource.com/infra/luci/luci-py/+/master/client/auth.py#44

Is it sensible enough to split the string at ":" and take the second part?

Or should the fix handle the possibility of a bot:something

Humm I'd say in this case user should probably be None. It's not meant to be an authenticated account.

I can take it, it's trivial.

I do like to see who shut down the bots, so I can ask them why or be aware of the fact.

But maybe user: is not the appropriate way to send that info.

The authenticated tag is already there.

There's no automatic tag yet for authenticated user, you'd like one?

Never mind, I missed Authenticated, which is totally fine.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/luci/luci-py.git/+/142222728b572da798b7b9e60650e997785d4238

commit 142222728b572da798b7b9e60650e997785d4238
Author: Marc-Antoine Ruel <maruel@chromium.org>
Date: Tue Aug 29 19:58:35 2017

Trim user from termination task

The authenticated user is not meant to be copied to the user field.

R=kjlubick@chromium.org
Bug:759851
Change-Id: I9349503093b855896842ab0e8c2ac6244899fcb7
Reviewed-on: https://chromium-review.googlesource.com/642117
Reviewed-by: Kevin Lubick <kjlubick@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>

[modify] https://crrev.com/142222728b572da798b7b9e60650e997785d4238/appengine/swarming/server/task_request.py

Live on prod