According to http://stackoverflow.com/questions/23095496/how-to-search-for-changesets-in-gerrit-than-need-to-be-rebased/, Gerrit 2.9 introduces the search operator "is:mergeable" which indicates whether a changeset needs a manual rebase or not. This would allow for easy searches for "all changesets that I need to rebase".
Version: unspecified
Severity: enhancement
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=50297