Docs: Add description for Kubernetes client metrics

[aLekSer]

Fix sdkServer logLevel parameter name in reference.

Add Allocator grafana dashboard link to the docs.

[agones-bot]

Build Succeeded 👏

Build Id: 4fb2c0de-be84-4e06-8e83-daebbfcbbbf2

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

• image: gcr.io/agones-images/agones-controller:1.5.0-6b65bb3
• image: gcr.io/agones-images/agones-sdk:1.5.0-6b65bb3
• image: gcr.io/agones-images/agones-ping:1.5.0-6b65bb3
• Linux C++ SDK (build): agonessdk-1.5.0-6b65bb3-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.5.0-6b65bb3.zip

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

• https://6b65bb3-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1409/head:pr_1409 && git checkout pr_1409
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.5.0-6b65bb3

[agones-bot]

Build Succeeded 👏

Build Id: 193f5e99-37d6-45f4-bc44-a1c1cf245e1d

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

• image: gcr.io/agones-images/agones-controller:1.5.0-fa564de
• image: gcr.io/agones-images/agones-sdk:1.5.0-fa564de
• image: gcr.io/agones-images/agones-ping:1.5.0-fa564de
• Linux C++ SDK (build): agonessdk-1.5.0-fa564de-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.5.0-fa564de.zip

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

• https://fa564de-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1409/head:pr_1409 && git checkout pr_1409
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.5.0-fa564de

[agones-bot]

Build Succeeded 👏

Build Id: b19b6e9f-c6d7-4a2b-b13b-223001310432

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

• image: gcr.io/agones-images/agones-controller:1.5.0-91d451d
• image: gcr.io/agones-images/agones-sdk:1.5.0-91d451d
• image: gcr.io/agones-images/agones-ping:1.5.0-91d451d
• Linux C++ SDK (build): agonessdk-1.5.0-91d451d-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.5.0-91d451d.zip

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

• https://91d451d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1409/head:pr_1409 && git checkout pr_1409
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.5.0-91d451d

[markmandel]

LGTM. I assume these fields are correct (I did a quick scan on a few of them 👍 )

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aLekSer, markmandel

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Failed 😱

Build Id: adb9cfcd-816a-4bb0-a6ef-d56e98ef1e4a

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[agones-bot]

Build Failed 😱

Build Id: 92a5c72b-b792-438c-be6c-7aec5f33a548

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[agones-bot]

Build Failed 😱

Build Id: a481a80e-c16a-4ab8-a7f1-b2f0b180e120

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[agones-bot]

Build Failed 😱

Build Id: 8c83caa6-eca6-4647-be3d-fe2f99febe55

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[agones-bot]

Build Succeeded 👏

Build Id: a4121cb4-c8e9-4fdd-b663-94fab88f078d

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

• image: gcr.io/agones-images/agones-controller:1.5.0-74d433b
• image: gcr.io/agones-images/agones-sdk:1.5.0-74d433b
• image: gcr.io/agones-images/agones-ping:1.5.0-74d433b
• Linux C++ SDK (build): agonessdk-1.5.0-74d433b-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.5.0-74d433b.zip

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

• https://74d433b-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1409/head:pr_1409 && git checkout pr_1409
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.5.0-74d433b