如何在Golang中实现自动化扩容策略

var qps = prometheus.NewGauge(prometheus.GaugeOpts{

    Name: "http_requests_per_second",

    Help: "Current requests per second",

})

<p>prometheus.MustRegister(qps)</p><p>// 在HTTP handler中更新

qps.Set(calculateQPS())

func shouldScaleUp(usage float64, threshold float64) bool {

    return usage > threshold

}

<p>func scale(replicas int, target int) error {

if target == replicas {

return nil

}

// 调用K8s API或云服务商SDK

return updateDeploymentReplicas(target)

}

import "k8s.io/client-go/kubernetes"

<p>func increaseReplicas(clientset *kubernetes.Clientset, deployment string, namespace string) error {

scale, err := clientset.AppsV1().Deployments(namespace).GetScale(deployment, metav1.GetOptions{})

if err != nil {

return err

}

scale.Spec.Replicas++

_, err = clientset.AppsV1().Deployments(namespace).UpdateScale(deployment, scale)

return err

}

tick := time.Tick(30 * time.Second)

for range tick {

    if shouldScale() {

        if time.Since(lastScaleTime) > 3*time.Minute {

            scaleUp()

            lastScaleTime = time.Now()

        }

    }

}