[Feature] Kruise Rollout Support full-link grey scale capability

[zmberg]

1. What is full-link grey scale?

2. What are the current capabilities of Rollout?

Currently Rollout only supports greyscale capabilities for a single workload, so if you need to support the above scenario, you need to configure four yaml configurations, which is complicated and not easy for users to understand. for example:

---
apiVersion: rollouts.kruise.io/v1alpha1
kind: Rollout
metadata:
  name: rollout-a
  annotations:
    rollouts.kruise.io/trafficrouting: mse-traffic
spec:
  objectRef:
    workloadRef:
      apiVersion: apps/v1
      kind: Deployment
      name: spring-cloud-a
  strategy:
    canary:
      steps:
        - pause: {}
          replicas: 1
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray
# c rollout configuration
---
apiVersion: rollouts.kruise.io/v1alpha1
kind: Rollout
metadata:
  name: rollout-c
  annotations:
    rollouts.kruise.io/trafficrouting: mse-traffic
spec:
  objectRef:
    workloadRef:
      apiVersion: apps/v1
      kind: Deployment
      name: spring-cloud-c
  strategy:
    canary:
      steps:
        - pause: {}
          replicas: 1
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray
---
apiVersion: rollouts.kruise.io/v1alpha1
kind: Rollout
metadata:
  name: rollout-b
  annotations:
    rollouts.kruise.io/trafficrouting: mse-traffic
spec:
  objectRef:
    workloadRef:
      apiVersion: apps/v1
      kind: Deployment
      name: spring-cloud-b
  strategy:
    canary:
      steps:
        - pause: {}
          replicas: 1
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray
---
apiVersion: rollouts.kruise.io/v1alpha1
kind: TrafficRouting
metadata:
  name: mse-traffic
spec:
  objectRef:
  - service: spring-cloud-a
      ingress:
        name: spring-cloud-a
        classType: mse
  strategy:
    matches:
    - headers:
      - type: RegularExpression
        name: x-user-agent
        value: 'andriod'
    #weight: 30 ,灰度30%流量；配置这个时，需要把 matches 字段去掉，不能并存
    requestHeaderModifier:
      set:
      - name: x-mse-tag
        value: gray

3. What is the objective of this Feature

A new CRD has been added to describe the full link grey scale model, simplifying user configuration and understanding costs:

apiVersion: rollouts.kruise.io/v1alpha1
kind: RolloutLane
metadata:
  name: lane-a
spec:
  objectRef:
  - service: spring-cloud-a
    ingress:
      name: spring-cloud-a
      classType: mse
  strategy:
    matches:
    - headers:
      - type: RegularExpression
        name: x-user-agent
        value: 'andriod | ios'
    #weight: 30 ,灰度30%流量；配置这个时，需要把 matches 字段去掉，不能并存
    requestHeaderModifier:
      set:
      - name: x-mse-tag
        value: gray
  workloadList:
    - workloadRef:
        apiVersion: apps/v1
        kind: Deployment
        name: spring-cloud-a
      replicas: 20%
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray
    - workloadRef:
        apiVersion: apps/v1
        kind: Deployment
        name: spring-cloud-b
      replicas: 20%
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray
    - workloadRef:
        apiVersion: apps/v1
        kind: Deployment
        name: spring-cloud-c
      replicas: 20%
      patchCanaryMetadata:
        labels:
          alicloud.service.tag: gray