Exactly at 00:00, errors were found in the zabbix server log. The frontend, the database worked, but the data on the graph, the latest data was not displayed. All proxies and agents have become unavailable.

Errors in the zabbix server log are presented in the attached file.
An example of data interruption is shown in screenshot 1.

There were a lot of "hanging" PIDs at the time of the crash (screenshot 2).

Stopping the zabbix server service (systemctl) did not help, the stop hung. The only way to solve the situation was to restart the virtual machine.