Grafana - add namespace to distinguish fleets with the same name

[akremsa]

What type of PR is this?

/kind bug

What this PR does / Why we need it:
Fleet metrics from different namespaces are split.

Which issue(s) this PR fixes:
Closes #1501

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: 2129b187-bffa-47b3-90ac-ad3996d5cbfa

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

• image: gcr.io/agones-images/agones-controller:1.7.0-125d78a
• image: gcr.io/agones-images/agones-sdk:1.7.0-125d78a
• image: gcr.io/agones-images/agones-ping:1.7.0-125d78a
• Linux C++ SDK (build): agonessdk-1.7.0-125d78a-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.7.0-125d78a.zip

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

• https://125d78a-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1597/head:pr_1597 && git checkout pr_1597
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.7.0-125d78a

[agones-bot]

Build Failed 😱

Build Id: 0632cba8-f1aa-47a0-af2b-a820dd86ff74

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[cyriltovena]

LGTM,

We need at some point to change this to jsonnet/grafonnet.

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akremsa, cyriltovena

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 7f9eea7c-495d-433c-b54f-3936952b8b40

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

• image: gcr.io/agones-images/agones-controller:1.7.0-e24089d
• image: gcr.io/agones-images/agones-sdk:1.7.0-e24089d
• image: gcr.io/agones-images/agones-ping:1.7.0-e24089d
• Linux C++ SDK (build): agonessdk-1.7.0-e24089d-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.7.0-e24089d.zip

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

• https://e24089d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1597/head:pr_1597 && git checkout pr_1597
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.7.0-e24089d

[agones-bot]

Build Succeeded 👏

Build Id: e0dea350-1b2b-4de5-944d-1c00bdf6a32f

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

• image: gcr.io/agones-images/agones-controller:1.7.0-8eea087
• image: gcr.io/agones-images/agones-sdk:1.7.0-8eea087
• image: gcr.io/agones-images/agones-ping:1.7.0-8eea087
• Linux C++ SDK (build): agonessdk-1.7.0-8eea087-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.7.0-8eea087.zip

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

• https://8eea087-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/GoogleCloudPlatform/agones.git pull/1597/head:pr_1597 && git checkout pr_1597
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.7.0-8eea087