Most of the info should be below in the version output. Our operation is small so we only have a single server acting as the master which also has the Icinga Web 2 (2.6.2) and Icinga Director (1.5.2) modules set up on it.
2 GB RAM
Most of our checks are using NRPE, SNMP, or pings.
icinga2 - The Icinga 2 network monitoring daemon (version: r2.10.2-1)
Copyright © 2012-2018 Icinga Development Team (https://icinga.com/)
License GPLv2+: GNU GPL version 2 or later http://gnu.org/licenses/gpl2.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Platform: CentOS Linux
Platform version: 7 (Core)
Kernel version: 3.10.0-957.1.3.el7.x86_64
Compiler: GNU 4.8.5
Build host: unknown
Config directory: /etc/icinga2
Data directory: /var/lib/icinga2
Log directory: /var/log/icinga2
Cache directory: /var/cache/icinga2
Spool directory: /var/spool/icinga2
Run directory: /run/icinga2
Old paths (deprecated):
Installation root: /usr
Sysconf directory: /etc
Run directory (base): /run
Local state directory: /var
Package data directory: /usr/share/icinga2
State path: /var/lib/icinga2/icinga2.state
Modified attributes path: /var/lib/icinga2/modified-attributes.conf
Objects path: /var/cache/icinga2/icinga2.debug
Vars path: /var/cache/icinga2/icinga2.vars
PID path: /run/icinga2/icinga2.pid