compareDuration property

When compare_duration is set, the GroupResult's "state_change" property is updated to indicate whether the asset was added, removed, or remained present during the compare_duration period of time that precedes the read_time.

This is the time between (read_time - compare_duration) and read_time. The state change value is derived based on the presence of the asset at the two points in time. Intermediate state changes between the two times don't affect the result. For example, the results aren't affected if the asset is removed and re-created again. Possible "state_change" values when compare_duration is specified: * "ADDED": indicates that the asset was not present at the start of compare_duration, but present at reference_time. * "REMOVED": indicates that the asset was present at the start of compare_duration, but not present at reference_time. * "ACTIVE": indicates that the asset was present at both the start and the end of the time period defined by compare_duration and reference_time. If compare_duration is not specified, then the only possible state_change is "UNUSED", which will be the state_change set for all assets present at read_time. If this field is set then state_change must be a specified field in group_by.