THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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2) Quite often one would like to perform operations on all consumer groups, thus, it would be great to have something as like an `--all-groups` option, similar to `--all-topics`.
3) In other cases, you would like to perform operations on a certain subset of consumer groups, thus, it would be great to have something as like a repeatable `--group` option for each group.
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