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