Raise it over at https://support.atlassian.com/contact
I would not bother if you're asking for Hipchat Cloud, as that's not being developed any more, you'd want to raise it for Stride. But Hipchat server is staying, so if it's that, go ahead.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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