Structure and terminology

Term	Meaning
Device	A saved computer, virtual machine or network device with a name and address.
Check	Monitoring that has been explicitly configured, such as Ping, HTTP, TCP, resources or an additional check.
Reading	An individual recorded value, such as CPU usage, response time or free memory.
Check interval	Time between regular checks, in seconds.
Response timeout	Time within which the respective query must respond.
Failed attempts	Consecutive failed queries before a fault is detected.
Agent	User account for the web interface. All agents have the same permissions.
Data collector	A separately operated program that runs assigned checks in a remote network and sends the results to the central server.
Dependency	Association of a device with an upstream Ping, TCP or HTTP check. It can suspend the device’s own checks.
Activation	Authorization tied to an installation for the number of monitored devices.

The device status is calculated from the checks that have actually been configured. Simply creating a device does not start an automatic Ping check. A missing Ping response may be caused by a firewall; on its own, it does not prove that a device has failed.