Update Canary Testing Documentation

[Kalaiselvi84]

What type of PR is this?

Uncomment only one /kind <> line, press 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
/kind release

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Closes #3758

Special notes for your reviewer:

[agones-bot]

Build Succeeded 👏

Build Id: 6bd95df8-e6cb-4cdc-a256-8e5aebd354ff

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.40.0-dev-60dc342-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.40.0-dev-60dc342-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.40.0-dev-60dc342-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.40.0-dev-60dc342-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.40.0-dev-60dc342-amd64
• Linux C++ SDK (build): agonessdk-1.40.0-dev-60dc342-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.40.0-dev-60dc342-amd64.zip

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

• https://60dc342-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3760/head:pr_3760 && git checkout pr_3760
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.40.0-dev-60dc342-amd64

[igooch]

Missing the "selectors" field, and we should remove the players selector. Also included a quick question for Mark on how he wants the labels to look.

[igooch]

@markmandel do you have any preference on if this examples uses the labels canary: "true" canary: "false" or agones.dev/fleet: green-fleet agones.dev/fleet: blue-fleet?

   selectors: 
     - matchLabels:
         canary: "true"
         agones.dev/fleet: green-fleet

[agones-bot]

Build Failed 😱

Build Id: 7fc24c8e-029b-46bc-9bab-04654c29fdf6

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[markmandel]

So right now this is a "canary and fleet is 'stable'" - what we actually want is "check the canary label'ed GameServers, and if there are none left, then go to the 'stable' fleet.

So we want this instead:

apiVersion: allocation.agones.dev/v1
kind: GameServerAllocation
spec:
  selectors:
    - matchLabels:
        canary: "true"
    - matchLabels:
        agones.dev/fleet: stable

Which will first look for the first selector, and if it fails go to the second.

[Kalaiselvi84]

I've made the changes you recommended.

[agones-bot]

Build Succeeded 👏

Build Id: 82ac2828-688f-46eb-8d3b-29ba35879f1b

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.40.0-dev-a312f0b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.40.0-dev-a312f0b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.40.0-dev-a312f0b-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.40.0-dev-a312f0b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.40.0-dev-a312f0b-amd64
• Linux C++ SDK (build): agonessdk-1.40.0-dev-a312f0b-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.40.0-dev-a312f0b-amd64.zip

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

• https://a312f0b-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3760/head:pr_3760 && git checkout pr_3760
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.40.0-dev-a312f0b-amd64

[igooch]

LGTM

[agones-bot]

Build Succeeded 👏

Build Id: fef90ca8-0886-41a8-a3a5-a40b7ac57016

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.40.0-dev-877678d-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.40.0-dev-877678d-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.40.0-dev-877678d-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.40.0-dev-877678d-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.40.0-dev-877678d-amd64
• Linux C++ SDK (build): agonessdk-1.40.0-dev-877678d-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.40.0-dev-877678d-amd64.zip

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

• https://877678d-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3760/head:pr_3760 && git checkout pr_3760
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.40.0-dev-877678d-amd64