Nagios Core is an open-source host and service monitoring engine for system administrators and operations teams. It focuses on plugin-based checks, notifications,...
Pros
- More mature availability checks and notification workflows than Survol
- Large plugin ecosystem for legacy and heterogeneous environments
- Straightforward fit for service-up and service-down monitoring
Cons
- Older interface and configuration model than modern alternatives
- Less capable for rich metrics, graphs, and relationship visualization
- Scaling and configuration management can be labor-intensive
Free; commercial products and support available
