Add queries for server and model performance metrics

[DaoDaoNoCode]

Closes #1130

Description

Update the queries that used to fetch the server and model metrics.
Update the chart with multiple legends to change the tooltip type.

How Has This Been Tested?

TBD

Test Impact

TBD

Request review criteria:

Self checklist (all need to be checked):

• The developer has manually tested the changes and verified that the changes work
• The commits have meaningful messages (squashes happen on merge by the bot).
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[alexcreasy]

The range of this chart looks wrong to me, as you're showing a percentage on the y-axis it should always show 0-100 so the user can clearly see where on the spectrum the values lie.

[alexcreasy]

My average response time graph is not showing any data or labels on the y-axis.

[alexcreasy]

Tested and reviewed, looks good, there's one question in there.

[alexcreasy]

@DaoDaoNoCode can you squash this into a single commit please? After that we're good to go.

[openshift-ci]

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