extern int afb_trace_add(struct afb_req req, struct json_object *args, struct afb_trace *trace);
extern int afb_trace_drop(struct afb_req req, struct json_object *args, struct afb_trace *trace);
extern int afb_trace_add(struct afb_req req, struct json_object *args, struct afb_trace *trace);
extern int afb_trace_drop(struct afb_req req, struct json_object *args, struct afb_trace *trace);