feat: convert Deployment to Rollout CRD with canary strategy

- Replace deployment.yaml with rollout.yaml
- Add canary-service.yaml for traffic splitting
- Add analysistemplate.yaml for Prometheus health checks
- Update HTTPRoute with dual backends (stable + canary)
- Update overlays with Rollout patches
- Add Rollout transformer configuration for Kustomize

apps/myapp/base/analysistemplate.yaml

@@ -0,0 +1,22 @@
+apiVersion: argoproj.io/v1alpha1
+kind: AnalysisTemplate
+metadata:
+  name: success-rate
+  labels:
+    app: myapp
+    managed-by: argocd
+spec:
+  args:
+  - name: service-name
+  metrics:
+  - name: success-rate
+    interval: 30s
+    successCondition: result[0] >= 0.95
+    failureLimit: 3
+    provider:
+      prometheus:
+        address: http://kube-prometheus-stack-prometheus.monitoring.svc.cluster.local:9090
+        query: |
+          sum(rate(http_requests_total{service="{{args.service-name}}",code=~"2.."}[1m]))
+          /
+          sum(rate(http_requests_total{service="{{args.service-name}}"}[1m]))

apps/myapp/base/canary-service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: myapp-canary
+  labels:
+    app: myapp
+    managed-by: argocd
+spec:
+  selector:
+    app: myapp
+  ports:
+  - port: 80
+    targetPort: 80

apps/myapp/base/deployment.yaml

@@ -1,21 +0,0 @@
-apiVersion: apps/v1
-kind: Deployment
-metadata:
-  name: myapp
-  labels:
-    app: myapp
-    managed-by: argocd
-spec:
-  selector:
-    matchLabels:
-      app: myapp
-  template:
-    metadata:
-      labels:
-        app: myapp
-    spec:
-      containers:
-      - name: myapp
-        image: nginx:alpine
-        ports:
-        - containerPort: 80

apps/myapp/base/httproute.yaml

@@ -17,3 +17,5 @@ spec:
     backendRefs:
     - name: myapp
       port: 80
+    - name: myapp-canary
+      port: 80

apps/myapp/base/kustomization.yaml

@@ -2,6 +2,11 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 
 resources:
-- deployment.yaml
+- rollout.yaml
 - service.yaml
+- canary-service.yaml
 - httproute.yaml
+- analysistemplate.yaml
+
+configurations:
+- https://argoproj.github.io/argo-rollouts/features/kustomize/rollout-transform-kustomize-v5.yaml

apps/myapp/base/rollout.yaml

@@ -0,0 +1,47 @@
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: myapp
+  labels:
+    app: myapp
+    managed-by: argocd
+spec:
+  revisionHistoryLimit: 3
+  selector:
+    matchLabels:
+      app: myapp
+  strategy:
+    canary:
+      canaryService: myapp-canary
+      stableService: myapp
+      trafficRouting:
+        plugins:
+          argoproj-labs/gatewayAPI:
+            httpRoute: myapp-route
+            namespace: default
+      analysis:
+        templates:
+        - templateName: success-rate
+        args:
+        - name: service-name
+          value: myapp
+        startingStep: 1
+      steps:
+      - setWeight: 10
+      - pause: {duration: 30s}
+      - setWeight: 30
+      - pause: {duration: 1m}
+      - setWeight: 60
+      - pause: {duration: 1m}
+      - setWeight: 100
+  template:
+    metadata:
+      labels:
+        app: myapp
+    spec:
+      containers:
+      - name: myapp
+        image: nginx:alpine
+        ports:
+        - name: http
+          containerPort: 80