Agents on events in Bitrix 1C are not executed?

Question

1C-Bitrix

Agents stopped running on events in 1C Bitrix.
Tell me what logs you can see.

Answer 1

For starters:
1) Were agents running on hits or on cron? Maybe someone started moving agents to cron and didn't finish the transfer.
2) Are the constants defined: BX_CRONTAB_SUPPORT and BX_CRONTAB ? Maybe the agents were on hits and someone defined the constants and didn't transfer them to cron. Or vice versa defined constants, without parameters below.
3) What are the values ​​for agents_use_crontab and check_agents ?

Answer 2

What does it mean

event agents

?
Skilled in view of the hits?