UI (JavaScript): add logic to keep track of interesting trends

[samantharitter]

such as...

• how many user connections a server has had in its lifetime
• how many user connections, in total, a server has at any one time
• how long a server has been alive
• how "fresh" each server is (can we reasonably measure this?)
• which servers are the most reliable (go down least, are primary most often, are most up-to-date)

[kchodorow]

Nice idea! They all sound good except for how "fresh" a server is; you can't determine that from the logs, unfortunately.