After upgrading yesterday, triggering stopped working today. There is some evidence that triggering did work for a time, but not conclusive.
I tried restarting Jenkins, then Gerrit. Nothing helped.
Saw logs of
What finally helped was downgrading to 2.28.0 of the plugin. Then triggering started again. I never tried re-saving a job; we have a few too many of those that I want to do that for all of them.