We've had Slack notifications configured for some time without issues in all of our repos.
However, we've noticed recently that sometimes they work, and sometimes they don't.
In some cases, an engineers first pull request won't notify, but their second will, and we've seen this in reverse will the first PR will notify, but the second won't. It doesn't seem to have an affect on approvals, or merging, however.
We've tried removing the configuration from the repo and replacing, reauthorizing, clearing cache, etc, but to no avail.
Has anyone else experienced anything like this before?
Any additional steps I might be able to take to isolate further?