Fixed getting latency metrics

[8398a7]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking

/kind bug

/kind cleanup
/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:
Because the gRPC endpoint cannot get latency metrics.

Which issue(s) this PR fixes:

Closes #1855

Special notes for your reviewer:

[agones-bot]

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Build Id: 68ac752c-e1f3-4ed7-bfae-69d1cd828a30

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Build Id: 579c8886-9805-491b-bf79-98a04c05ade2

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Build Succeeded 👏

Build Id: 5ee57d57-c29f-4a19-bb32-4ce5ed2d1c60

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.12.0-46af90d
• image: gcr.io/agones-images/agones-sdk:1.12.0-46af90d
• image: gcr.io/agones-images/agones-ping:1.12.0-46af90d
• Linux C++ SDK (build): agonessdk-1.12.0-46af90d-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.12.0-46af90d.zip

A preview of the website (the last 30 builds are retained):

• https://46af90d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1969/head:pr_1969 && git checkout pr_1969
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.12.0-46af90d

[markmandel]

This looks good to me, a couple of questions, one thought:
Do we want some kind of unit test with this, just to make sure the metrics stay in place and do what we expect?

If you have them, can you take a screenshot of the metrics showing up in a dashboard? Just good for audit trails (I can fire it up and install it, but figured you might have it handy).

But otherwise, no issue on my end.

[8398a7]

I couldn't think of a way to write a good unit test, so I submitted a screenshot.

[markmandel]

Thanks! LGTM!

[google-oss-robot]

New changes are detected. LGTM label has been removed.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 8398a7, markmandel

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[agones-bot]

Build Succeeded 👏

Build Id: 276fb059-9629-442c-8086-c7259b5dbac7

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.12.0-2d6be05
• image: gcr.io/agones-images/agones-sdk:1.12.0-2d6be05
• image: gcr.io/agones-images/agones-ping:1.12.0-2d6be05
• Linux C++ SDK (build): agonessdk-1.12.0-2d6be05-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.12.0-2d6be05.zip

A preview of the website (the last 30 builds are retained):

• https://2d6be05-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1969/head:pr_1969 && git checkout pr_1969
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.12.0-2d6be05