Yes, the message is there to encourage Chromium devs to edit that file :)

We have a bug on file to make editing that file less necessary (https://bugs.chromium.org/p/chromium/issues/detail?id=706095), but for now it still needs to be updated when the set of available bots changes.

Would you like to learn how to update the config?

$ git fetch origin refs/meta/config
$ git checkout FETCH_HEAD
$ vim buildbucket.config
$ git commit -a
$ git push origin HEAD:refs/for/refs/meta/config
$ git checkout <whatever branch you were on before>

Or I can do it for you if you have no interest in trying it yourself.

I'll give it a shot. :)  Wasn't sure if there was some reason for not having them there.

Ah, thanks for filing this, and thanks Aaron for the instructions! I saw that notice and wanted to add those blink try bots there but couldn't quickly figure out how to edit a file in "refs/meta/config".

Just tried out the instructions above: https://chromium-review.googlesource.com/c/520223/

Thanks Quinten!  Sorry I didn't get around to doing this.

https://chromium-review.googlesource.com/c/520265/ has landed

No problem :-)

Awesome, now I already see tryserver.blink bots in the Gerrit try bot selection menu.