Add deprecation warning re unset namespace in k8s hook #27202
Merged
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Currently when k8s conn defined but namespace not set, we return 'default'. This is not good behavior because e.g. in KPO we aren't able to tell whether user explicitly set namespace or whether it's just inserted as a fallback -- something that's important for applying precedence.
So we deprecate the return of 'default'. In next major, we'll just return None.