syntax = "proto3";

package udpa.annotations;

import "google/protobuf/descriptor.proto";

extend google.protobuf.MessageOptions {
  // Magic number derived from 0x78 ('x') 0x44 ('D') 0x53 ('S')
  VersioningAnnotation versioning = 7881811;
}

message VersioningAnnotation {
  // Track the previous message type. E.g. this message might be
  // udpa.foo.v3alpha.Foo and it was previously udpa.bar.v2.Bar. This
  // information is consumed by UDPA via proto descriptors.
  string previous_message_type = 1;
}