I have used Integration of Slack with both Confluence and Jira,
Confluence really helps to maintain a Doc for a Jira Ticker ( linkable both the ways).
Slack integration helps to get notification on any changes on Jira Ticket or Confluence page, which had help to check and Priortize
Community moderators have prevented the ability to post new comments.
I love the Slack integration that tells you when a new Jira issue has been created... since I spend all day in Slack it's nice to be able to track it there!