This is related to and a possible workaround for How can I watch a tag?:
The site seems to offer a fairly sophisticated variation of RSS feeds for the various content types and areas, but a crucial bit is missing, namely the content categories and tags.
If those would be exposed on the feed items, it would at least provide a viable workaround to monitor a category and filter out relevant content, for example to allow marketplace vendors to monitor the Atlassian Marketplace category feed and filter for the support tag that is automatically linked from their add-on listing.
Given that's a fairly standard feed feature, I'd hope that including tags might just require to enable a resp. flag or so?
Many thanks,
Steffen