const google.golang.org/protobuf/internal/genid.FieldOptions_RETENTION_SOURCE_enum_value

one use

	google.golang.org/protobuf/internal/genid (current package)
		descriptor_gen.go#L730: 	FieldOptions_RETENTION_SOURCE_enum_value  = 2

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)