View Single Monitor View
In the Monitor Views is where all your monitoring services are shown.
You can filter, sort, show, edit, delete, Customize the Health Graph, and Edit Monitor View.
A single Monitor View shows a "Live Overview", the "Historic events", and the services it consists of.
The "Live Overview" is similar to the health graph but in shows single services within the Monitor View instead.
Clicking a share will show only the services within the share.
Historic events shows the number of events within the chosen time span.
Under Customize you will find some alternatives of time spans: