Argo Rollouts canary: traffic weights on an HTTPRoute and analysis from Prometheus

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: checkout
  namespace: shop
spec:
  replicas: 6
  selector:
    matchLabels:
      app: checkout
  template:
    metadata:
      labels:
        app: checkout
    spec:
      containers:
        - name: checkout
          image: ghcr.io/acme/checkout:2.5.0
          ports:
            - containerPort: 8080
  strategy:
    canary:
      stableService: checkout-stable
      canaryService: checkout-canary
      trafficRouting:
        plugins:
          argoproj-labs/gatewayAPI:
            httpRoute: checkout
            namespace: shop
      steps:
        - setWeight: 10
        - pause: { duration: 5m }
        - analysis:
            templates:
              - templateName: success-rate
        - setWeight: 50
        - pause: { duration: 10m }
---
apiVersion: v1
kind: Service
metadata:
  name: checkout-stable
  namespace: shop
spec:
  selector:
    app: checkout
  ports:
    - port: 80
      targetPort: 8080
---
apiVersion: v1
kind: Service
metadata:
  name: checkout-canary
  namespace: shop
spec:
  selector:
    app: checkout
  ports:
    - port: 80
      targetPort: 8080
---
apiVersion: gateway.networking.k8s.io/v1
kind: HTTPRoute
metadata:
  name: checkout
  namespace: shop
spec:
  parentRefs:
    - name: public
      namespace: infra
  hostnames:
    - shop.example.com
  rules:
    - backendRefs:
        - name: checkout-stable
          port: 80
          weight: 100
        - name: checkout-canary
          port: 80
          weight: 0
---
apiVersion: argoproj.io/v1alpha1
kind: AnalysisTemplate
metadata:
  name: success-rate
  namespace: shop
spec:
  metrics:
    - name: success-rate
      interval: 1m
      count: 5
      failureLimit: 1
      successCondition: result[0] >= 0.99
      provider:
        prometheus:
          address: http://prometheus-k8s.monitoring.svc:9090
          query: |
            sum(rate(http_requests_total{service="checkout-canary",code!~"5.."}[2m]))
              / sum(rate(http_requests_total{service="checkout-canary"}[2m]))