Hello,
In my company we use the webhooks in our all trackers. Some days ago we've updated Tuleap to version 11.18.99.252 in our Test environment.
Apparently, after that some artfacts are not sending webhooks.
I made a test, creating a new artifact in the tracker that is not sending webhook and it worked. So now I have a tracker with an artifact sending webhooks and other artifact not.
There is no message in nginx error log.