Update `additional_metrics.yml` for the new support for colors
This MR does two things:
- Adjusts the queries to now support returning multiple series where it makes sense. (CPU utilization, throughput)
- Updates the documentation for the new queries, and improves the nginx-ingress configuration guide.
Note this MR depends upon !14100 (merged), as that includes the underlying support for the new queries. For ease of review these changes are in a separate MR.
Closes #37600 (closed)
Edited by Joshua Lambert