This operation asks the target top-level OS to count the number of active alarms as restricted by the provided filter. The target OS sends the result to the requesting OS.
The operation can only be directed to a top-level OS and not to a subordinate OS.

Operation Exceptions: 
1. INTERNAL_ERROR - Raised in case of non-specific OS internal failure. 
2. NOT_IMPLEMENTED - If the addressed OS is a subordinate OS; i.e., does not support this operation.
3. INVALID_INPUT - Raised when an invalid input parameter is provided (e.g., invalid filter syntax).
4. COMM_FAILURE - Raised when communication to an entity (needed to help fulfill the request) is lost.
