PhoneSystemCreateStatistics(String) Method
(obsolete) Creates realtime statistic storage
or returns existing one in "statistics" realtime table
User should define name of statistic and take care about its lifetime.
Configuration server will hold this statistics until it will be restarted.
It is not prohibited to update the same statistic from many processes, but it not recommended.
Statistics object is not thread safe and has mutable implementation.
User should manage access to this object if it is necessary to update the same object from many threads.