This variable indicates the maximum number of notifications issued per second. If events occur more rapidly, the implementation may simply fail to emit these notifications during that period, or may queue them until an appropriate time. In case the implementation chooses to drop the events during throttling instead of queuing them to be sent at a later time, it is assumed that there will be no indication that events are being thrown away. A value of 0 means no throttling is applied and events may be generated at the rate at which they occur.