Monitor charts headings are not aligned to the panel group title

Summary

Monitor charts headings are not aligned to the panel group title

Steps to reproduce

• Visit the monitor dashboard and add display some metrics:
  • http://<ip>:3000/root/autodevops-deploy/environments/27/metrics
• See the charts headings

What is the current bug behavior?

The title and chart are not aligned:

example 1	example 2

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What is the expected correct behavior?

The title and chart align correctly:

Possible fixes

Just in terms of ensuring this chart is consistent with the other charts: I think the y-axis title is meant to be 16px from the edge of the y-axis labels. It looks like it's greater than that here?

Related to: https://gitlab.com/gitlab-org/gitlab-ee/issues/14783