In the server, there may be multiple instances of a class that registers a mutex in the ObservableMutexRegistry under one tag. For example, there are multiple ConnectionPool instances that all register their mutex with the tag ConnectionPool::_mutex. This is desired so we can see aggregated stats over all ConnectionPool mutexes, however we may also want to easily determine stats for the mutex of a specific ConnectionPool instance. We should consider adding a field to the registry that could hold a more descriptive label per mutex (for example, the name of the ConnectionPool).