event_log中的那些前缀标志到底是什么意思?

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NumTagName格式功能
30001am_finish_activityUser,Token,TaskID,ComponentName,Reason 
30002am_task_to_frontUser,Task 
30003am_new_intentUser,Token,TaskID,ComponentName,Action,MIMEType,URI,Flags 
30004am_create_taskUser ,Task ID 
30005am_create_activityUser ,Token ,TaskID ,ComponentName,Action,MIMEType,URI,Flags 
30006am_restart_activityUser ,Token ,TaskID,ComponentName 
30007am_resume_activityUser ,Token ,TaskID,ComponentName 
30008am_anrUser ,pid ,Package Name,Flags ,reasonANR
30009am_activity_launch_timeUser ,Token ,ComponentName,time 
30010am_proc_boundUser ,PID ,ProcessName 
30011am_proc_diedUser ,PID ,ProcessName 
30012am_failed_to_pauseUser ,Token ,Wanting to pause,Currently pausing 
30013am_pause_activityUser ,Token ,ComponentName 
30014am_proc_startUser ,PID ,UID ,ProcessName,Type,Component 
30015am_proc_badUser ,UID ,ProcessName 
30016am_proc_goodUser ,UID ,ProcessName 
30017am_low_memoryNumProcessesLru
30018am_destroy_activityUser ,Token ,TaskID,ComponentName,Reason 
30019am_relaunch_resume_activityUser ,Token ,TaskID,ComponentName 
30020am_relaunch_activityUser ,Token ,TaskID,ComponentName 
30021am_on_paused_calledUser ,ComponentName 
30022am_on_resume_calledUser ,ComponentName 
30023am_killUser ,PID ,ProcessName,OomAdj ,Reason杀进程
30024am_broadcast_discard_filterUser ,Broadcast ,Action,ReceiverNumber,BroadcastFilter 
30025am_broadcast_discard_appUser ,Broadcast ,Action,ReceiverNumber,App 
30030am_create_serviceUser ,ServiceRecord ,Name,UID ,PID 
30031am_destroy_serviceUser ,ServiceRecord ,PID 
30032am_process_crashed_too_muchUser ,Name,PID 
30033am_drop_processPID 
30034am_service_crashed_too_muchUser ,Crash Count,ComponentName,PID 
30035am_schedule_service_restartUser ,ComponentName,Time 
30036am_provider_lost_processUser ,Package Name,UID ,Name 
30037am_process_start_timeoutUser ,PID ,UID ,ProcessNametimeout
30039am_crashUser ,PID ,ProcessName,Flags ,Exception,Message,File,LineCrash
30040am_wtfUser ,PID ,ProcessName,Flags ,Tag,MessageWtf
30041am_switch_userid 
30042am_activity_fully_drawn_timeUser ,Token ,ComponentName,time 
30043am_focused_activityUser ,ComponentName 
30044am_home_stack_movedUser ,To Front ,Top Stack Id ,Focused Stack Id ,Reason 
30045am_pre_bootUser ,Package 
30046am_meminfoCached,Free,Zram,Kernel,Native内存
30047am_pssPid, UID, ProcessName, Pss, Uss