Problem/Motivation It would be useful if FlagCountManager offered a method to count a particular flag. This would be like ::getEntityFlagCounts() except that it would also take a string flag_id param and return an integer, the count for that flag_id.

Proposed resolution Add a new method.

Remaining tasks Agree on the name of the method. Implement.

User interface changes None.

API changes Method is added.

Data model changes None.