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+# EffectiveVerticalPodAutoscaler
+
+EffectiveVerticalPodAutoscaler（简称 EVPA）是 Crane 提供的横向弹性伸缩产品，相比社区的 VPA 产品，EVPA 支持更丰富的弹性策略（预测，观测，周期），更灵活的扩展性。
+ 
+- 丰富的弹性策略：支持分别配置扩容和缩容的弹性配置。
+- 可扩展的弹性算法：支持用户自定义弹性算法，结合内置的 Effective VPA 算法支持各类弹性需求。
+- 稳定性保障：提供了阈值控制、冷却时间的控制能力，提高了 Effective VPA 的稳定性。
+- 可观测性：提供了一系列内置的观测指标，帮助用户更好的掌握集群中 Effective VPA 的状态。
+
+## 产品功能
+
+一个简单的 EVPA yaml 文件如下：
+
+```yaml
+apiVersion: autoscaling.crane.io/v1alpha1
+kind: EffectiveVerticalPodAutoscaler
+metadata:
+  name: php-apache
+spec:
+  targetRef:
+    apiVersion: "apps/v1"
+    kind: Deployment
+    name: php-apache
+  resourcePolicy:
+    containerPolicies:
+      - containerName: 'php-apache'
+        minAllowed:
+          cpu: 100m
+          memory: 50Mi
+        maxAllowed:
+          cpu: 1
+          memory: 500Mi
+        controlledResources: ["cpu", "memory"]
+        scaleDownPolicy:
+          metricThresholds:
+            cpu:
+              utilization: 35
+            memory:
+              utilization: 40
+            mode: Auto
+        stabilizationWindowSeconds: 43200
+        scaleUpPolicy:
+          metricThresholds:
+            cpu:
+              utilization: 95
+            memory:
+              utilization: 95
+          mode: Auto
+          stabilizationWindowSeconds: 150
+```
+
+1. ScaleTargetRef 配置你希望弹性的工作负载。
+2. ScaleDownPolicy 定义了容器缩容策略。
+3. ScaleUpPolicy 定义了容器扩容策略。
+
+### ScaleDownPolicy 和 ScaleUpPolicy
+
+#### 可扩展的弹性算法
+
+#### 稳定性保障
+
+#### 可观测性
+
+### EffectiveVerticalPodAutoscaler status
+Effective VPA 的 status 展示了推荐伸缩的资源值。
+
+以下是一个 Effective VPA 的 Status yaml 例子：
+```yaml
+status:
+  conditions:
+    - lastTransitionTime: "2022-05-23T04:10:11Z"
+      message: EffectiveVerticalPodAutoscaler is ready
+      reason: EffectiveVerticalPodAutoscaler
+      status: "True"
+      type: Ready
+  currentEstimators:
+    - lastUpdateTime: "2022-05-23T04:10:11Z"
+      recommendation:
+        containerRecommendations:
+          - containerName: php-apache
+            target:
+              cpu: 114m
+              memory: "120586239"
+      type: Percentile
+
+
+```
diff --git a/examples/autoscaling/effective-vpa.yaml b/examples/autoscaling/effective-vpa.yaml
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+apiVersion: autoscaling.crane.io/v1alpha1
+kind: EffectiveVerticalPodAutoscaler
+metadata:
+  name: php-apache
+spec:
+  targetRef:
+    apiVersion: "apps/v1"
+    kind: Deployment
+    name: php-apache
+  resourcePolicy:
+    containerPolicies:
+      - containerName: 'php-apache'
+        minAllowed:
+          cpu: 100m
+          memory: 50Mi
+        maxAllowed:
+          cpu: 1
+          memory: 500Mi
+        controlledResources: ["cpu", "memory"]
+        scaleDownPolicy:
+        metricThresholds:
+          cpu:
+            utilization: 35
+          memory:
+            utilization: 40
+        mode: Auto
+        stabilizationWindowSeconds: 43200
+        scaleUpPolicy:
+          metricThresholds:
+            cpu:
+              utilization: 95
+            memory:
+              utilization: 95
+          mode: Auto
+          stabilizationWindowSeconds: 150
+