High availability is a key component of network performance.
Periods of internal unavailability reduce productivity and keep employees from having information at hand when it's needed. Unavailability of public services discourages customers and partners.
Availability monitoring lets an organization detect and fix any lapses quickly. It can help to prove that a service lives up to its service level agreements.
What monitoring does
The purpose of availability monitoring is to identify the failure of any server, service, or device on the network to respond within acceptable time limits.
It will report when the component fails to respond and when it becomes available again. Short periods of unavailability may simply be logged; if a component doesn't come back promptly, the monitor will issue an alert.
Loss of availability may have several causes: