xds: make certificate provider instance name required #36441
Merged
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Commit Message: xds: make certificate provider instance name required
Additional Description: The comment saying that there is a default value for this field is misleading. All existing gRPC implementations have this as a required field. Note that this change does not affect Envoy, since Envoy does not yet support this field. However, I've added a PGV annotation (used by Envoy but not by gRPC) to avoid confusion when Envoy eventually adds support for this field.
Risk Level: Low
Testing: N/A
Docs Changes: Included in PR
Release Notes: N/A
Platform Specific Features: N/A