I visited this page: https://confluence.atlassian.com/display/HIPCHAT/Chat+in+rooms#Chatinrooms-Managingrooms but it doesn't address if rooms are "unarchivable" - able to be turned back on - and if so, will the JIRA and Bitbucket integrations pick back up.
I tested this out by archiving a linked room, changing the status of the JIRA ticket, unarchiving the room, and then leaving a comment on the issue. While the room was archived, there was no notification. After the room was unarchived, the notification for the comment came through.
In short, looks like the integrations pick back up immediately. My guess is that they never stop working, but HipChat just rejects the integration messages if the room is archived.
All good things come to an end - thanks to all our customers and partners who have been along the Hipchat and Stride journey with us. As of Feb 15th 2019, Hipchat Cloud and Stride have reached ...
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