The "/timeline.rss" page:

Produce an RSS feed of the timeline.

TYPE may be: all, ci (show check-ins only), t (show ticket changes only), w (show wiki only), e (show tech notes only), f (show forum posts only), g (show tag/branch changes only).

LIMIT is the number of items to show.

tkt=HASH filters for only those events for the specified ticket. tag=TAG filters for a tag, and wiki=NAME for a wiki page. Only one may be used.

In addition, name=FILENAME filters for a specific file. This may be combined with one of the other filters (useful for looking at a specific branch).