Nagios Core, the classic infrastructure monitoring engine, ready to watch hosts and services the moment it boots.
Nagios Core is an open source monitoring system that checks the health of hosts, services, and network devices and raises alerts when problems occur. It is a long standing tool for keeping infrastructure availability under continuous watch.
cloudimg ships Nagios Core preconfigured on a hardened, fully patched Ubuntu 24.04 base so the monitoring console is reachable straight after boot. A unique admin credential is generated on first boot with no default login, and 24/7 support is included.