labels.container.keyword filters to CPU metrics

[mukrishn]

Add labels.container.keyword filters to CPU metrics in trt-external-payload configs to query specific containers instead of aggregating across all containers in a namespace

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[afcollins]

Needs rebase to pass test.

Also, please can we attach orion output using these configs so we can see what changepoints may change upon merge? Maybe we can proactively add ack's to this PR as well so they can all go in together.

[mohit-sheth]

/lgtm

[mukrishn]

Needs rebase to pass test.

Also, please can we attach orion output using these configs so we can see what changepoints may change upon merge? Maybe we can proactively add ack's to this PR as well so they can all go in together.

tested out - https://gist.github.com/mukrishn/46cd17cf3e0e94984c715bcdade787be