1"track","process","thread","thread_process","ts","dur","category","name"
2"[NULL]","[NULL]","t1","[NULL]",1000,0,"cat","instant_on_t1"
3"[NULL]","[NULL]","t1","[NULL]",2000,0,"cat","legacy_instant_on_t1"
4"[NULL]","[NULL]","t1","[NULL]",3000,0,"cat","legacy_mark_on_t1"
5