For events originated by the CMM: If this event is part of a event group, this will be the unique identifier from 1 - 255 for the event group. Zero means no group. An alert in the same event group replaces an active alert from the group. The recovery event in the group clears the active alert in the group. For events created by the node system-management processor that are logged by CMM: This field is a correlator from 0 - 254 that is the same for a node alert and the node recovery event for the alert. A node recovery event clears an existing node alert if all of the following fields from the node alert and the node recovery event match: the event correlator (spEventCorrelator) value, the Blade UUID (spTrapBladeUuid), and the Blade Event Data Source (spBladeEventDataSource). NOTE: spEventCorrelator is only available on Flex System.