// If a apiserver client is passed in, the function will try to get kubelet metrics from metrics grabber;
// or else, the function will try to get kubelet metrics directly from the node.
func getKubeletMetricsFromNode(c *client.Client, nodeName string) (metrics.KubeletMetrics, error) {
if c == nil {
return metrics.GrabKubeletMetricsWithoutProxy(nodeName)
}
grabber, err := metrics.NewMetricsGrabber(c, true, false, false, false)
if err != nil {
return metrics.KubeletMetrics{}, err
}
return grabber.GrabFromKubelet(nodeName)
}
// getPodStartLatency gets prometheus metric 'pod start latency' from kubelet
func getPodStartLatency(node string) (framework.KubeletLatencyMetrics, error) {
latencyMetrics := framework.KubeletLatencyMetrics{}
ms, err := metrics.GrabKubeletMetricsWithoutProxy(node)
Expect(err).NotTo(HaveOccurred())
for _, samples := range ms {
for _, sample := range samples {
if sample.Metric["__name__"] == kubemetrics.KubeletSubsystem+"_"+kubemetrics.PodStartLatencyKey {
quantile, _ := strconv.ParseFloat(string(sample.Metric["quantile"]), 64)
latencyMetrics = append(latencyMetrics,
framework.KubeletLatencyMetric{
Quantile: quantile,
Method: kubemetrics.PodStartLatencyKey,
Latency: time.Duration(int(sample.Value)) * time.Microsecond})
}
}
}
return latencyMetrics, nil
}