DBShardGroupIdentifier: The user-supplied DB shard group identifier. If this parameter is specified, information for only the specific DB shard group is returned. This parameter isn't case-sensitive.
Constraints:
If supplied, must match an existing DB shard group identifier.
Filters: A filter that specifies one or more DB shard groups to describe.
Marker: An optional pagination token provided by a previous describe_db_shard_groups request. If this parameter is specified, the response includes only records beyond the marker, up to the value specified by MaxRecords.
MaxRecords: The maximum number of records to include in the response. If more records exist than the specified MaxRecords value, a pagination token called a marker is included in the response so you can retrieve the remaining results.