Release Channels

[Starefossen]

Release Channel will make it possible to automatically upgrade instances when new versions become available:

apiVersion: unleash.nais.io/v1
kind: ReleaseChannel
metadata:
  name: stable
spec:
  image: repo.example.com/my/image:tag
  matchLabels:
    unleash.nais.io/release-channel: stable
  strategy:
    maxSurge: 2
    canary:
      enabled: true
      matchLabels:
       unleash.nais.io/canary: true

Reconciler:

• finds all matching Unleash instances
• starts with the ones maching ReleaseChannel.spec.strategy.canary.matchLabels
• runs in parallel according to ReleaseChannel.spec.strategy.maxSurge
• updates Unleash.spec.customImage waiting for rollout to succeed (depends on Wait for rollout #260)
• stop rollout if an Unleash instance fails and marks ReleaseChannel as failed

Questions:

• how to prevent customImage from being "reset" by the user
  • default to ReleaseChannel when no Unleash.spec.customImage is set