There is a bug in some versions of snmp that cause the message

systemstats_linux: unexpected header length in /proc/net/snmp. 237 != 224

to be posted to the logs. It is not an indication of a real problem.

To prevent it from being posted to rsyslog, create a file named /etc/rsyslog.d/ignore_systemstats_header.conf and insert one line:

:msg, contains, "systemstats_linux: unexpected header length in /proc/net/snmp" ~

then execute systemctl restart rsyslog

Tested on  Rocky Linux 9