Bug 1584947 will surface for the 1st time the measurement units for perf data (when they're provided).
It'll mostly do its job, but we need to decide if we could improve it, once it lands.
There are some questions which require our decision.
What should Perfherder do when the user wants to add 2 perf series with different measurement units, via Add test data button?
I think we should allow, but warn that the selected series have mismatching units. Then the y-axis should omit the metric, but we can display it in the popup when hovering over the datapoints. When the series all share the same metric, then we should display this on the y-axis.