As discussed here, we plan to deprecate the Auto value in the UpdateMode field API.

Since a value cannot be removed from a GA API version, this deprecation will be a multi-step process. For now, until a new API version is introduced for the VPA, we will focus on providing clear warnings. More information on the deprecation policy can be found here.

• Documentation Updates - Modify the API reference and user guides to explicitly state that UpdateMode: Auto is deprecated and to recommend using other explicit values. The documentation should also link to this deprecation issue for more context.
• Add API Warnings: Add deprecation warnings when Auto is used.
• Add Log Messages: When a VPA controller processes a VPA object with updateMode: Auto, it should emit a clear log message indicating that this value is deprecated and will be removed in a future API version.
• Add unit test: Create a new unit test that verifies the API server correctly returns the deprecation warning header when an object with updateMode: Auto is submitted.

/area vertical-pod-autoscaler
/good-first-issue
/kind api-change