GetResourceReplicas

metrics,&nbsp;timestamp,&nbsp;err&nbsp;:=&nbsp;c.metricsClient.GetResourceMetric(resource,&nbsp;namespace,&nbsp;selector,&nbsp;container)<br>&nbsp;<font color="#b71c1c">获取指标以及时间</font>

podList,&nbsp;err&nbsp;:=&nbsp;c.podLister.Pods(namespace).List(selector)<br>&nbsp;<font color="#b71c1c">获取工作负载所有关联pod</font>

readyPodCount,&nbsp;unreadyPods,&nbsp;missingPods,&nbsp;ignoredPods&nbsp;:=&nbsp;groupPods(podList,&nbsp;metrics,&nbsp;resource,&nbsp;c.cpuInitializationPeriod,&nbsp;c.delayOfInitialReadinessStatus)<br>&nbsp;removeMetricsForPods(metrics,&nbsp;ignoredPods)<br>&nbsp;removeMetricsForPods(metrics,&nbsp;unreadyPods)<br>&nbsp;<font color="#b71c1c">对pod进行分组，readyPodCount,&nbsp;unreadyPods,&nbsp;missingPods,&nbsp;ignoredPods并从指标中去除ignoredPods，unreadyPods</font>

requests,&nbsp;err&nbsp;:=&nbsp;calculatePodRequests(podList,&nbsp;container,&nbsp;resource)<br>&nbsp;<font color="#b71c1c">计算所有pod的request用量</font><br>

usageRatio,&nbsp;utilization,&nbsp;rawUtilization,&nbsp;err&nbsp;:=&nbsp;metricsclient.GetResourceUtilizationRatio(metrics,&nbsp;requests,&nbsp;targetUtilization)<br><font color="#b71c1c">获取使用比率，当前资源利用率，平均使用量（基于request计算）</font>

rebalanceIgnored&nbsp;:=&nbsp;len(unreadyPods)&nbsp;&gt;&nbsp;0&nbsp;&amp;&amp;&nbsp;usageRatio&nbsp;&gt;&nbsp;1.0 <font color="#b71c1c">未就绪pod大于0，并且usageRatio&gt;1.0。可以忽略伸缩。等待就绪pod完成，会重新计算指标，避免频繁扩容</font>

&nbsp;if&nbsp;!rebalanceIgnored&nbsp;&amp;&amp;&nbsp;len(missingPods)&nbsp;==&nbsp;0&nbsp;{<br>&nbsp;&nbsp;if&nbsp;math.Abs(1.0-usageRatio)&nbsp;&lt;=&nbsp;c.tolerance&nbsp;{<br>&nbsp;&nbsp;&nbsp;//&nbsp;return&nbsp;the&nbsp;current&nbsp;replicas&nbsp;if&nbsp;the&nbsp;change&nbsp;would&nbsp;be&nbsp;too&nbsp;small<br>&nbsp;&nbsp;&nbsp;return&nbsp;currentReplicas,&nbsp;utilization,&nbsp;rawUtilization,&nbsp;timestamp,&nbsp;nil<br>&nbsp;&nbsp;}<br><br>&nbsp;&nbsp;//&nbsp;if&nbsp;we&nbsp;don't&nbsp;have&nbsp;any&nbsp;unready&nbsp;or&nbsp;missing&nbsp;pods,&nbsp;we&nbsp;can&nbsp;calculate&nbsp;the&nbsp;new&nbsp;replica&nbsp;count&nbsp;now<br>&nbsp;&nbsp;return&nbsp;int32(math.Ceil(usageRatio&nbsp;*&nbsp;float64(readyPodCount))),&nbsp;utilization,&nbsp;rawUtilization,&nbsp;timestamp,&nbsp;nil<br>&nbsp;}

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