Zimbra 8.8.12 OSE on Ubuntu 16.04. What is the processor doing?

Question

ubuntu

Having read that an exploit of previous versions is rampant on the network, I decided to put up a stand with version 8.8.12 (now 8.6 is used, and the upgrade is long overdue). The system is deployed on 2 servers, on one: amavis, antispam, antivirus, dnscache, memcached, mta, opendkim, proxy, stats, zmconfigd.
On the other: ldap, logger, mailbox, service webapp, spell, stats, zimbra webapp, zimbraAdmin webapp, zimlet webapp, zmconfigd.
The resources allocated are exactly the same as for servers in production: one CPU core and 8 GB of memory each.
And now, judging by the monitoring, the processor on one server, on the other, is constantly busy with something. On a freshly installed system, which does not even process mail yet, configuration details are only slowly transferred.
This is what server performance monitoring looks like from 8.8:

This is what a typical top screen looks like:

And here is what server monitoring shows from 8.6:

Where can I try to dig, what to look for?

Answer 1

Welcome:
https://lorenzo.mile.si/zimbra-cve-2019-9670-being...

Answer 2

Does Zabbix have monitoring of running processes? You can trace the processes that consume the most resources.
If this is not there, then the atop utility can be useful for analyzing activity on the server. including those processes.