[chore] [processor/groupbyattrs] clarify compaction occurs even when no key matches #31027
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I expected the processor to be a complete no-op if no attribute keys match, but I noticed that it still does perform compaction, as if the processor was configured with an empty config (no keys). In some sense it feels like having both grouping and compaction features in one processor is confusing, but it's not that bad in practice but this doc clarification can make it less surprising.