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+# Progressive Delivery with GitOps (2024-2025)
+
+## Argo Rollouts (with ArgoCD)
+
+**Current Focus**: Kubernetes-native progressive delivery
+
+**Deployment Strategies**:
+
+### 1. Canary
+```yaml
+apiVersion: argoproj.io/v1alpha1
+kind: Rollout
+metadata:
+  name: my-app
+spec:
+  strategy:
+    canary:
+      steps:
+      - setWeight: 20
+      - pause: {duration: 5m}
+      - setWeight: 50
+      - pause: {duration: 5m}
+      - setWeight: 100
+```
+
+### 2. Blue-Green
+```yaml
+spec:
+  strategy:
+    blueGreen:
+      activeService: my-app
+      previewService: my-app-preview
+      autoPromotionEnabled: false
+```
+
+### 3. Analysis with Metrics
+```yaml
+spec:
+  strategy:
+    canary:
+      analysis:
+        templates:
+        - templateName: success-rate
+        args:
+        - name: service-name
+          value: my-app
+```
+
+**Metric Providers**: Prometheus, Datadog, New Relic, CloudWatch
+
+## Flagger (with Flux)
+
+**Installation**:
+```bash
+flux install
+kubectl apply -k github.com/fluxcd/flagger//kustomize/linkerd
+```
+
+**Canary with Flagger**:
+```yaml
+apiVersion: flagger.app/v1beta1
+kind: Canary
+metadata:
+  name: my-app
+spec:
+  targetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: my-app
+  service:
+    port: 9898
+  analysis:
+    interval: 1m
+    threshold: 5
+    maxWeight: 50
+    stepWeight: 10
+    metrics:
+    - name: request-success-rate
+      thresholdRange:
+        min: 99
+```
+
+## Best Practices
+
+1. **Start with Manual Approval** (autoPromotionEnabled: false)
+2. **Monitor Key Metrics** (error rate, latency, saturation)
+3. **Set Conservative Steps** (10%, 25%, 50%, 100%)
+4. **Define Rollback Criteria** (error rate > 1%)
+5. **Test in Staging First**
+
+## 2025 Recommendation
+
+**For ArgoCD users**: Argo Rollouts (tight integration, UI support)
+**For Flux users**: Flagger (CNCF project, modular design)