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Klaus Aehlig authored
The subtle points of upgrading a cluster can only be found in QA, so add a method to do so. A prerequisite is, that both versions are installed on the test cluster. To have a realistic scenario, instances are created on both versions. Signed-off-by: Klaus Aehlig <aehlig@google.com> Reviewed-by: Helga Velroyen <helgav@google.com>
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