+ ret = lttng_msgpack_begin_map(writer, 2);
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_msgpack_write_str(writer, "type");
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_msgpack_write_str(writer, "enum");
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_msgpack_write_str(writer, "value");
+ if (ret) {
+ goto end;
+ }