Required. The group whose members are listed. The format is:
:: projects/[PROJECT_ID_OR_NUMBER]/groups/[GROUP_ID]
If this field is not empty then it must contain the
next_page_token value returned by a previous call to this
method. Using this field causes the method to return
additional results from the previous method call.
An optional time interval for which results should be
returned. Only members that were part of the group during the
specified interval are included in the response. If no
interval is provided then the group membership over the last
minute is returned.
