feat(datasinkref): openapi schema spec defaulting #80
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What this PR does / why we need it:
This PR introduces basic api server defaulting for the data sink reference of all metric types.
Fixes #30
Special notes for your reviewer:
The empty object in the parent struct triggers the defaulting when no dataSinkRef is provided.
Note that this doesn't cover the case of a user explicitly specifying a data sink with an empty string ("") which is handled in the controller but there is no proper way to handle this in openapi. minLength=1 would be a potential workaround but this felt like such an edge case that i left it out and i definitely would not introduce a mutating webhook for this.
Release note: