Hi.
It seems we have a problem with triggering Webhooks on creation of artifacts. I have just given it a long try. Specifically I tried using the CreationDate with operators such as: "changed" or "changed-from" (both of which are documented in the webhook API page), but none of that worked. I discussed with Engineering and they confirmed it is an issue.
What you probably can still do is something like: CreationDate > some-date . This will trigger also on updates, but then you can inspect your payload and filter it on 'Action = Created' .
We may want to open up a support case for this and report it, please let me know if you'd like to.
Also, let us know if inspecting the payload the filtering on the 'Action = Created' is helping.
Thanks,
Sagi