Easy solution is to restrict who sees the submit button in project.config.
You could restrict it just to git-admins:
	submit = group mdb/chrome-git-admins

I had the submit button for skia restricted to git-admins but made it available to all committers temporarily as a workaround for https://bugs.chromium.org/p/chromium/issues/detail?id=634944

You could put in a warning in commitqueue.js, but deploying that will take time. Editing project.config will take a few seconds.

I am certain there was a warning before. It stopped working just recently.

The warning I think actually comes from chumpdetector.js, not commitqueue.js. I recently landed some changes to the chumpdetector config:

https://chromium.googlesource.com/All-Projects/+log/refs/meta/config/chumpdetector.config
https://chrome-internal.googlesource.com/All-Projects/+log/refs/meta/config/chumpdetector.config

Maybe those changes are broken?

Hey, yes, indeed, it's chumpdetector plugin. But the changes you've referenced are 10 days old, i thought it was working after those landed, but am not sure.

And I've just seen it working on my Gerrit plugin project[1]. So, that explains why I've seen it so recently, so perhaps those changes of yours are responsible, but I don't yet see how.

I'm doing a lot of work on the chumpdetector plugin (see https://bugs.chromium.org/p/chromium/issues/detail?id=671878 and https://bugs.chromium.org/p/chromium/issues/detail?id=673779), and this should be resolved at the same time.

Update: Lots of changes to chumpdetector have been landed, making it way easier to verify that configs are correct, and manage configs on a per-project basis. But changes haven't been deployed yet; probably have to wait another week for next deployment.

As can be seen on https://canary-chromium-review.googlesource.com/c/426370/, chromium/tools/build (and all other repos which inherit from infra) now correctly have the chumpdetector enabled on canary. This will be rolled out to prod later this week.