Make mission control better to watch generic roll-outs with

[fbertsch]

For generic roll-outs, we probably don't need to worry about crashes, but more about things like:

• total number of clients
• total number of downloads/installs
• session hours

In addition, the plots should auto update without refreshing.

[fbertsch]

This will also require reading from new streaming data sources.

[wlach]

Yup, definitely. We actually track client counts and session hours as part of the error aggregates already, but maybe those numbers would be better off in their own series.