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At the moment, the ListGroups API always returns all groups. There are metrics that track the number of groups in several states but the only way to know the state of a group is to describe it using the DescribeGroups API. In large clusters with hundreds or thousands of groups, it can be hard for a cluster administrator to identify which groups are stable or which groups are dead and can be deleted for example. Basically this requires describing a large number of groups which is inefficiency in terms of time for the administrator and load for the cluster.

To improve that use case, I propose to allow listing groups by state. For example listing stable groups allows to immediately tell if several applications are healthy if their groups are all returned without needing to describe each group. This would allow building tools and user interfaces that can easily and quickly display informations about live groups.

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