I did an integration with Slack. Just installed 6 and performed the upgrade yesterday. That went very easily, which is great, but now my integration is not working. It's picking up new tickets, but not comments anymore. I looked at the documentation page for the REST API and don't see any mention of changes with the new version. Something has to have changed because we had this running 24x7 on a lot of projects and it was pouring comments right up to the time of upgrade.