The Channels Dashboard will display a list of your channels based on any filters you choose, including Any, Active, Pending, Inactive, and Closed. You can also sort the list by certain parameters such as age.
If you click a channel from the channels list, more detailed information on the channel and peer will be displayed including metrics such as historical fee policy.
The Channel Uptime gauge is a way to tell at a glance if the channel is stable over a given time period. This is a very good way to gauge the overall health of a channel.
The historical activity of this particular channel will also be displayed including forwards, receives, and sends.