if u dont know who is spamming to alert log there is the way to figure out this

col cnt format a20
col host_id format a20
col message_text format a40
col process_id format a10
select count(*) cnt,host_id,message_text,process_id from X$DBGALERTEXT where message_text like '%Turning off busy%' group by host_id,message_text,process_id;

       CNT | HOST_ID              | MESSAGE_TEXT                             | PROCESS_ID
---------- | -------------------- | ---------------------------------------- | ----------
     28857 | xxxxxxxxxxxxxxxxxxxx | Turning off busy                         | 28518     

[xxxxxxxxxxxxxxxxxxxx ]# ps -ef | grep 28518 | grep -v "grep"
oracle   28518     1 25 Oct16 ?        10:23:42 ora_fbda_xxxxxx2

and it’s Flasback process =)

ps:oracle 12.1