Centreon version is 24.10.2.
I run check command manually:

/usr/lib/centreon/plugins//centreon_linux_snmp.pl --plugin=os::linux::snmp::plugin --mode=processcount --hostname=localhost --snmp-version='2c' --snmp-community='public'  --process-name='centengine' --process-path='/usr/sbin/' --process-args='' --regexp-name --regexp-path --regexp-args --warning='' --critical='1:1' 

Result:

CRITICAL: Number of current processes running: 0 | 'nbproc'=0;;1:1;0;

This solved most of the “critical” centreon-central services:

Cannot install postfix | Community

Now only tree integrated centreon services are critical:

Looks like good clues, are you using ssh? https://docs.centreon.com/pp/integrations/plugin-packs/procedures/operatingsystems-linux-ssh/#ssh-configuration

• no swap
  • free -h
• can’t tell much about this service
  • is it running?
• access not allowed for centreon-engine
• is it running?