Set up dashboards (usage, volume, cardinality etc.)

[matejminar]

Jesse:

- Count of Organisations grouped by the number of metrics they send?
	- If lots of organisations are only sending one metric, then that's a problem!
- For all the organisations that have emitted a metric, how many of them are coming back to the metric page over a 30d period?
	- If the number of sessions drop off sharply after the first metric is emitted, then that's a problem!
- Count of Metrics grouped by the number of tags they have?
	- If most emitted metrics only have one tag, then that's a problem!
- What's the distribution of orgs that use metrics and have other products setup?
	- Organisations that use metrics but don't use performance is a problem! I think this is rare though. 
- What's percentage of users visiting a trace when viewing the metrics page?
	- If all of the above is healthy, but they're still not visiting a trace, we can assume a few things
		1. They have performance instrumented, but they don't use it
		2. They have performance instrumented, but they didn't need to view a span to solve their problem
	- However, if the conversation rate is super low, then that's still cause for concern.