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The ReturnArgAction was added to the KProbeSpec to allow actions to be taken on the return values from hooked functions. It was specified as an enumeration in order to constrain its use to the supported actions, namely: Post, TrackSock and UntrackSock. This has the unintended consequence of making it non-optional through K8S validation.
This commit makes the ReturnArgAction optional.
Fixes: f851189