Bug: The Mutating method of PodResourceConsistWebhooks updates the PodAvailableConditionsAnnotation of the pod in full rather than incrementally, which may lead to the loss of existing annotations.

[cyh-ant]

Minimal reproduce step

The steps to reproduce the bug are as follows:

1. Apply the deployment yaml, as follow

apiVersion: apps/v1
kind: Deployment
metadata:
  name: cyh-test1
spec:
  selector:
    matchLabels:
      app: cyh-test1
  replicas: 1
  template:
    metadata:
      labels:
        app: cyh-test1
        kusionstack.io/control: "true"
      annotations:
        pod.kusionstack.io/available-conditions: "{\"expectedFinalizers\":{\"testKind/default/test1\":\"prot.podopslifecycle.kusionstack.io/nacos-traffic\"}}"
    spec:
      containers:
      - image: nginx:latest
        name: webhook-test

Focus on the pod.kusionstack.io/available-conditions of Deployment.
2. Watch the pod annotation of above Deployment.

What did you expect to see?

The pod contains the expectedFinalizers annotations of Deployment.

What did you see instead

The actual pod yaml is show below:

apiVersion: v1
kind: Pod
metadata:
  annotations:
    pod.kusionstack.io/available-conditions: '{}'
  creationTimestamp: "2024-01-03T07:44:09Z"
  generateName: cyh-test1-8567966c88-
  labels:
    app: cyh-test1
    kusionstack.io/control: "true"
    pod-template-hash: 8567966c88
    podopslifecycle.kusionstack.io/service-available: "1704267853"
  name: cyh-test1-8567966c88-9s9t2
  namespace: default
  ownerReferences:
  - apiVersion: apps/v1
    blockOwnerDeletion: true
    controller: true
    kind: ReplicaSet
    name: cyh-test1-8567966c88
    uid: 4036e01c-86a1-410e-a542-1c3463d81a55
  resourceVersion: "1705"
  uid: fc29d6fb-632b-46c4-aa2f-41a10c6ea2de

The pod.kusionstack.io/available-conditions annotation is empty.

What is your KusionStack components and its version?