Use protobuf in gardener components #2836
Description
How to categorize this issue?
/area performance cost
/kind enhancement
/priority normal
What would you like to be added:
Currently all gardener components are configured to accept and send requests with content type application/json.
We should switch to protobuf (application/vnd.kubernetes.protobuf) by default, where possible.
As we heavily make use of CRDs in our Seed clusters it might not be possible to switch the seed client connection settings to protobuf at all, as CRDs don't support protobuf. But at least for the garden client connection it should be possible.
A fallback to json can be defined for acceptContentTypes with application/vnd.kubernetes.protobuf;application/json.
Why is this needed:
Using protobuf should be more efficient and might safe some data transfer costs.