Fix y-axis unit in spa
Fix y-axis unit in spa

Most statistics have the same unit as the timeseries.
However, the 'count' and 'nans' statistics should use the count unit.

Bug: chromium:952290
Change-Id: I036b62163e72fbf0854f798084c43c44a55083c7
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/1573839
Reviewed-by: Simon Hatch <490a224d89645d3fea983d7189ce51bde0a00c1d@chromium.org>
Commit-Queue: Ben Hayden <d3ffe0e065c2328e497bb32a07f4dcb29138ef5b@chromium.org>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult