Yes, this is possible in vanilla FishEye if your instance administrator enabled watches for particular repository, see https://confluence.atlassian.com/display/FISHEYE/Browsing+through+a+repository#Browsingthrougharepository-Watchingarepository.
In order to watch activity in particular repository or any folder or that repository open this repository/folder in FishEye (e.g. https://fisheye2.atlassian.com/browse/ehcache/trunk/ehcache/ehcache-core/src/main/java/net/sf/ehcache), then click on the Tools cog in the top right corner and select "Watch" option. Note you need to be logged in to see this option.
If you want to watch particular file only, go to activity stream of selected repository folder and click "Filter commits" to filter for example only files of particular name. Then again click Tools cog and select Watch to add watch for your filter.
You can later review and manage your watches by selecting Profile Settings / Watches.
Hope that helps,
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