Use prometheus extraction library for metric parsing in e2e tests
This commit is contained in:
Tim St. Clair
@@ -33,7 +33,11 @@ import (
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"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/metrics"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/master/ports"
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"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
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cadvisor "github.com/google/cadvisor/info/v1"
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"github.com/prometheus/client_golang/extraction"
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"github.com/prometheus/client_golang/model"
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)
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// KubeletMetric stores metrics scraped from the kubelet server's /metric endpoint.
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@@ -56,96 +60,58 @@ func (a KubeletMetricByLatency) Len() int { return len(a) }
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func (a KubeletMetricByLatency) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a KubeletMetricByLatency) Less(i, j int) bool { return a[i].Latency > a[j].Latency }
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// KubeletMetricIngester implements extraction.Ingester
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type kubeletMetricIngester []KubeletMetric
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func (k *kubeletMetricIngester) Ingest(samples model.Samples) error {
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acceptedMethods := util.NewStringSet(
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metrics.PodWorkerLatencyKey,
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metrics.PodWorkerStartLatencyKey,
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metrics.SyncPodsLatencyKey,
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metrics.PodStartLatencyKey,
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metrics.PodStatusLatencyKey,
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metrics.ContainerManagerOperationsKey,
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metrics.DockerOperationsKey,
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metrics.DockerErrorsKey,
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)
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for _, sample := range samples {
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const prefix = metrics.KubeletSubsystem + "_"
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metricName := string(sample.Metric[model.MetricNameLabel])
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if !strings.HasPrefix(metricName, prefix) {
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// Not a kubelet metric.
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continue
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}
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method := strings.TrimPrefix(metricName, prefix)
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if !acceptedMethods.Has(method) {
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continue
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}
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if method == metrics.DockerErrorsKey {
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Logf("ERROR %v", sample)
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}
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latency := sample.Value
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operation := string(sample.Metric["operation_type"])
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var quantile float64
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if val, ok := sample.Metric[model.QuantileLabel]; ok {
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var err error
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if quantile, err = strconv.ParseFloat(string(val), 64); err != nil {
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continue
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}
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}
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*k = append(*k, KubeletMetric{operation, method, quantile, time.Duration(int64(latency)) * time.Microsecond})
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}
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return nil
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}
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// ReadKubeletMetrics reads metrics from the kubelet server running on the given node
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func ParseKubeletMetrics(metricsBlob string) ([]KubeletMetric, error) {
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metric := make([]KubeletMetric, 0)
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for _, line := range strings.Split(metricsBlob, "\n") {
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// A kubelet stats line starts with the KubeletSubsystem marker, followed by a stat name, followed by fields
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// that vary by stat described on a case by case basis below.
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// TODO: String parsing is such a hack, but getting our rest client/proxy to cooperate with prometheus
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// client is weird, we should eventually invest some time in doing this the right way.
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if !strings.HasPrefix(line, fmt.Sprintf("%v_", metrics.KubeletSubsystem)) {
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continue
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}
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keyVal := strings.Split(line, " ")
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if len(keyVal) != 2 {
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return nil, fmt.Errorf("Error parsing metric %q", line)
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}
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keyElems := strings.Split(line, "\"")
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latency, err := strconv.ParseFloat(keyVal[1], 64)
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if err != nil {
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continue
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}
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methodLine := strings.Split(keyElems[0], "{")
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methodList := strings.Split(methodLine[0], "_")
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if len(methodLine) != 2 || len(methodList) == 1 {
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continue
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}
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method := strings.Join(methodList[1:], "_")
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var operation, rawQuantile string
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var quantile float64
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switch method {
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case metrics.PodWorkerLatencyKey:
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// eg: kubelet_pod_worker_latency_microseconds{operation_type="create",pod_name="foopause3_default",quantile="0.99"} 1344
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if len(keyElems) != 7 {
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continue
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}
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operation = keyElems[1]
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rawQuantile = keyElems[5]
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break
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case metrics.PodWorkerStartLatencyKey:
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// eg: kubelet_pod_worker_start_latency_microseconds{quantile="0.99"} 12
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fallthrough
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case metrics.SyncPodsLatencyKey:
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// eg: kubelet_sync_pods_latency_microseconds{quantile="0.5"} 9949
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fallthrough
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case metrics.PodStartLatencyKey:
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// eg: kubelet_pod_start_latency_microseconds{quantile="0.5"} 123
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fallthrough
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case metrics.PodStatusLatencyKey:
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// eg: kubelet_generate_pod_status_latency_microseconds{quantile="0.5"} 12715
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if len(keyElems) != 3 {
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continue
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}
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operation = ""
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rawQuantile = keyElems[1]
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break
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case metrics.ContainerManagerOperationsKey:
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// eg: kubelet_container_manager_latency_microseconds{operation_type="SyncPod",quantile="0.5"} 6705
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fallthrough
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case metrics.DockerOperationsKey:
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// eg: kubelet_docker_operations_latency_microseconds{operation_type="info",quantile="0.5"} 31590
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if len(keyElems) != 5 {
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continue
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}
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operation = keyElems[1]
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rawQuantile = keyElems[3]
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break
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case metrics.DockerErrorsKey:
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Logf("ERROR %v", line)
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default:
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continue
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}
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quantile, err = strconv.ParseFloat(rawQuantile, 64)
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if err != nil {
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continue
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}
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metric = append(metric, KubeletMetric{operation, method, quantile, time.Duration(int64(latency)) * time.Microsecond})
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}
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return metric, nil
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var ingester kubeletMetricIngester
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err := extraction.Processor004.ProcessSingle(strings.NewReader(metricsBlob), &ingester, &extraction.ProcessOptions{})
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return ingester, err
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}
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// HighLatencyKubeletOperations logs and counts the high latency metrics exported by the kubelet server via /metrics.
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