This adds a handful of metrics to /api/v2/metrics/ recorded from the dispatcher main process
Adds logic in the dispatcher period tasks to calculate these for the last collection interval
Reports worker count, task count, scale up events, and availability
Add data to demo grafana dashboard
More fun in the grafana dashboard. The rows organize the panels and are
collapsable. Also, tested with multiple nodes and fixed some
labeling issues when there are more than one node.
Update grafana alerting readme info and some fun prose about one of the
alerts as well as some reorganizing of the code for clarity.
finally, drop the time to fire for alerts because it's better to have them be a bit touchy so users can verify they work vs. not being sure.
* fix name to be consistent
this is not a mean, its the last value
so say that in the name
* add remaining capacity to dashboard
also make legends pretty with nice names
