Description of problem:
Have a VM running and view the VM Overview utilization card, the font size about the usage on the pie chart are too small to read, however the usage on the line chart are okay as its font size is normal.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. view VM utilization card
2.
3.

Actual results:
the font size on the pie chart is too small to read

Expected results:
it should have the same font size as it does on the line chart shows below

Additional info: