In https://mozilla-releng.net/trychooser/ you can check a box that says: To compare talos numbers we need 5 retriggers. Do you want to retrigger talos jobs 5 times? Checking this box generates in the try syntax: --rebuild-talos 5 But this doesn't do anything. In particular, in this try push: https://treeherder.mozilla.org/#/jobs?repo=try&revision=4243fd25743565f31fa933f3d006cb8d00c382c6&group_state=expanded I used it, but ended up having to retrigger the jobs manually since --rebuild-talos didn't do anything.

I'm not actually sure what makes '--rebuild-talos' work, but I have noticed a lag sometimes before they get scheduled. https://treeherder.mozilla.org/#/jobs?repo=try&revision=e2a4155360d36010c95b9bcc7fee731430ee4de7&filter-searchStr=talos does seem to get the right number of talos jobs scheduled. I'll find the right component / owner for this.

Looks like it's triggerbot.

Trigger bot isn't implemented for taskcluster builds, those retriggers should be handled in the taskgraph. It looks like this was implemented in bug 1333167.

Maybe fixed by bug 1317189?