1. get a metric with a graph.  if mri, use cane, else flay (why?)
2. get a metric without a graph. hotspots
3. enable only those two metrics

But it's sorta hard to read

Couldn't you 

```ruby
def enable_metric_with_graph
  MetricFu.configure_metric(:cane).enabled = true
end
def enable_metric_without_graph
  MetricFu.configure_metric(:hotspots).enabled = true
end
```