<commit_before>##TODO List

The following are the items that need to be added:
* Add support for group_by feature in QueryMetric type.
* Add TimeZone support.
* Implement the Delete Data Points API.<commit_msg>Update the todo list.<commit_after>##TODO List

The following are the items that need to be added:
* Add support for group_by feature in QueryMetric type.
* Add TimeZone support.
* Add Roll-ups support.
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