1syntax = "proto3"; 2 3package udpa.annotations; 4 5import "google/protobuf/descriptor.proto"; 6 7extend google.protobuf.MessageOptions { 8 // Magic number derived from 0x78 ('x') 0x44 ('D') 0x53 ('S') 9 VersioningAnnotation versioning = 7881811; 10} 11 12message VersioningAnnotation { 13 // Track the previous message type. E.g. this message might be 14 // udpa.foo.v3alpha.Foo and it was previously udpa.bar.v2.Bar. This 15 // information is consumed by UDPA via proto descriptors. 16 string previous_message_type = 1; 17} 18