...
- Active and passive checks: how the checks are possible on an host
- Host and check scheduling: how the host and the check scheduling is done depending on their states
- Host monitoring: how hosts are checks and their states
- Check monitoring: how check on the hosts are done
- Status & Context: how status and status context are computed for host and checks
- Hard & Soft Logic: what the monitoring logic do to be sure a problem is real
- Understanding host and check datas and How They Work: what are custom data set on the host and checks, and why they are useful to manage thresholds
- Notifications: what are notification and when they are launched
- Plugins: what are plugins, and how they execute
...