Moved issue gerrit:8402 to now be issue chromium:816630.

You can already do this: click the "choose trybots" button, and select the bots you want.

I'm reopening, do you have any manual how to do it?

I'm asking because it doesn't work for me and I'm asking for running (not displaying) them

What repo are you talking about? If it has a buildbucket.config file in its refs/meta/config, there will be a "CHOOSE TRYBOTS" button. This functionality is pretty stable.

OK, I will ask this way:

I have change (for example https://chromium-review.googlesource.com/c/chromium/src/+/877759) and I want to run concrete trybot only.

How can I do it? (I need specific steps which will work with my privileges)

Ok, you are talking about chromium/src. That's an important piece of information, thank you.

You have the ability to run the CQ dry run, so you should be able to see the button on the right-hand side of the attachment, as long as you're signed in.

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thx for your answer, unfortunately after clicking it I see such window and I'm afraid, that I cannot do anything more.

Is it possible to-do something with this please?

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Well that's exciting, I've never seen that before.

Please do the following:
1) Open the network inspector (Chrome menu -> more tools -> developer tools -> network)
2) Refresh the page
3) Find the request for "buildbucket~config" and paste its contents here

i'm using ff and no requests are done during opening this window.

during reloading page I don't see buildbucket~config related request.

Ok, that's the problem. Without loading buildbucket~config, it can't know what builders to show you in that popup window.

I see the bug: In Firefox, the buildbucket plugin is being initialized without a 'plugin' object, and so the config request is going to 'undefined~config', rather than 'buildbucket~config', and therefore understandably 404ing.

Sending this over to the Gerrit team so they can fix plugin loading in firefox: https://bugs.chromium.org/p/gerrit/issues/detail?id=8647