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Implementation of
GetStatsSummary and GetMetricsResource for Virt…
…ual Kubelet (#163) * implemented GetStatsSummary and GetMetricsResource for Virtual Kubelet * fixed ClusterRole for node proxy * limit the clusterrole with get and list * remove unused Metrics client interface
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196 changes: 196 additions & 0 deletions
196
k3k-kubelet/provider/collectors/kubelet_resource_metrics.go
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| /* | ||
| Copyright (c) Microsoft Corporation. | ||
| Licensed under the Apache 2.0 license. | ||
| See https://github.com/virtual-kubelet/azure-aci/tree/master/pkg/metrics/collectors | ||
| */ | ||
|
|
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| package collectors | ||
|
|
||
| import ( | ||
| "time" | ||
|
|
||
| stats "github.com/virtual-kubelet/virtual-kubelet/node/api/statsv1alpha1" | ||
| compbasemetrics "k8s.io/component-base/metrics" | ||
| ) | ||
|
|
||
| // defining metrics | ||
| var ( | ||
| nodeCPUUsageDesc = compbasemetrics.NewDesc("node_cpu_usage_seconds_total", | ||
| "Cumulative cpu time consumed by the node in core-seconds", | ||
| nil, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
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| nodeMemoryUsageDesc = compbasemetrics.NewDesc("node_memory_working_set_bytes", | ||
| "Current working set of the node in bytes", | ||
| nil, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
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| containerCPUUsageDesc = compbasemetrics.NewDesc("container_cpu_usage_seconds_total", | ||
| "Cumulative cpu time consumed by the container in core-seconds", | ||
| []string{"container", "pod", "namespace"}, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
||
| containerMemoryUsageDesc = compbasemetrics.NewDesc("container_memory_working_set_bytes", | ||
| "Current working set of the container in bytes", | ||
| []string{"container", "pod", "namespace"}, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
||
| podCPUUsageDesc = compbasemetrics.NewDesc("pod_cpu_usage_seconds_total", | ||
| "Cumulative cpu time consumed by the pod in core-seconds", | ||
| []string{"pod", "namespace"}, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
||
| podMemoryUsageDesc = compbasemetrics.NewDesc("pod_memory_working_set_bytes", | ||
| "Current working set of the pod in bytes", | ||
| []string{"pod", "namespace"}, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
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| resourceScrapeResultDesc = compbasemetrics.NewDesc("scrape_error", | ||
| "1 if there was an error while getting container metrics, 0 otherwise", | ||
| nil, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
|
|
||
| containerStartTimeDesc = compbasemetrics.NewDesc("container_start_time_seconds", | ||
| "Start time of the container since unix epoch in seconds", | ||
| []string{"container", "pod", "namespace"}, | ||
| nil, | ||
| compbasemetrics.ALPHA, | ||
| "") | ||
| ) | ||
|
|
||
| // NewResourceMetricsCollector returns a metrics.StableCollector which exports resource metrics | ||
| func NewKubeletResourceMetricsCollector(podStats *stats.Summary) compbasemetrics.StableCollector { | ||
| return &resourceMetricsCollector{ | ||
| providerPodStats: podStats, | ||
| } | ||
| } | ||
|
|
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| type resourceMetricsCollector struct { | ||
| compbasemetrics.BaseStableCollector | ||
|
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| providerPodStats *stats.Summary | ||
| } | ||
|
|
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| // Check if resourceMetricsCollector implements necessary interface | ||
| var _ compbasemetrics.StableCollector = &resourceMetricsCollector{} | ||
|
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| // DescribeWithStability implements compbasemetrics.StableCollector | ||
| func (rc *resourceMetricsCollector) DescribeWithStability(ch chan<- *compbasemetrics.Desc) { | ||
| ch <- nodeCPUUsageDesc | ||
| ch <- nodeMemoryUsageDesc | ||
| ch <- containerStartTimeDesc | ||
| ch <- containerCPUUsageDesc | ||
| ch <- containerMemoryUsageDesc | ||
| ch <- podCPUUsageDesc | ||
| ch <- podMemoryUsageDesc | ||
| ch <- resourceScrapeResultDesc | ||
| } | ||
|
|
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| // CollectWithStability implements compbasemetrics.StableCollector | ||
| // Since new containers are frequently created and removed, using the Gauge would | ||
| // leak metric collectors for containers or pods that no longer exist. Instead, implement | ||
| // custom collector in a way that only collects metrics for active containers. | ||
| func (rc *resourceMetricsCollector) CollectWithStability(ch chan<- compbasemetrics.Metric) { | ||
| var errorCount float64 | ||
| defer func() { | ||
| ch <- compbasemetrics.NewLazyConstMetric(resourceScrapeResultDesc, compbasemetrics.GaugeValue, errorCount) | ||
| }() | ||
|
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| statsSummary := *rc.providerPodStats | ||
| rc.collectNodeCPUMetrics(ch, statsSummary.Node) | ||
| rc.collectNodeMemoryMetrics(ch, statsSummary.Node) | ||
|
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| for _, pod := range statsSummary.Pods { | ||
| for _, container := range pod.Containers { | ||
| rc.collectContainerStartTime(ch, pod, container) | ||
| rc.collectContainerCPUMetrics(ch, pod, container) | ||
| rc.collectContainerMemoryMetrics(ch, pod, container) | ||
| } | ||
| rc.collectPodCPUMetrics(ch, pod) | ||
| rc.collectPodMemoryMetrics(ch, pod) | ||
| } | ||
| } | ||
|
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| // implement collector methods and validate that correct data is used | ||
|
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| func (rc *resourceMetricsCollector) collectNodeCPUMetrics(ch chan<- compbasemetrics.Metric, s stats.NodeStats) { | ||
| if s.CPU == nil || s.CPU.UsageCoreNanoSeconds == nil { | ||
| return | ||
| } | ||
|
|
||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(s.CPU.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(nodeCPUUsageDesc, compbasemetrics.CounterValue, float64(*s.CPU.UsageCoreNanoSeconds)/float64(time.Second))) | ||
| } | ||
|
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| func (rc *resourceMetricsCollector) collectNodeMemoryMetrics(ch chan<- compbasemetrics.Metric, s stats.NodeStats) { | ||
| if s.Memory == nil || s.Memory.WorkingSetBytes == nil { | ||
| return | ||
| } | ||
|
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||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(s.Memory.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(nodeMemoryUsageDesc, compbasemetrics.GaugeValue, float64(*s.Memory.WorkingSetBytes))) | ||
| } | ||
|
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| func (rc *resourceMetricsCollector) collectContainerStartTime(ch chan<- compbasemetrics.Metric, pod stats.PodStats, s stats.ContainerStats) { | ||
| if s.StartTime.Unix() <= 0 { | ||
| return | ||
| } | ||
|
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| ch <- compbasemetrics.NewLazyMetricWithTimestamp(s.StartTime.Time, | ||
| compbasemetrics.NewLazyConstMetric(containerStartTimeDesc, compbasemetrics.GaugeValue, float64(s.StartTime.UnixNano())/float64(time.Second), s.Name, pod.PodRef.Name, pod.PodRef.Namespace)) | ||
| } | ||
|
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| func (rc *resourceMetricsCollector) collectContainerCPUMetrics(ch chan<- compbasemetrics.Metric, pod stats.PodStats, s stats.ContainerStats) { | ||
| if s.CPU == nil || s.CPU.UsageCoreNanoSeconds == nil { | ||
| return | ||
| } | ||
|
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||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(s.CPU.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(containerCPUUsageDesc, compbasemetrics.CounterValue, | ||
| float64(*s.CPU.UsageCoreNanoSeconds)/float64(time.Second), s.Name, pod.PodRef.Name, pod.PodRef.Namespace)) | ||
| } | ||
|
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| func (rc *resourceMetricsCollector) collectContainerMemoryMetrics(ch chan<- compbasemetrics.Metric, pod stats.PodStats, s stats.ContainerStats) { | ||
| if s.Memory == nil || s.Memory.WorkingSetBytes == nil { | ||
| return | ||
| } | ||
|
|
||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(s.Memory.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(containerMemoryUsageDesc, compbasemetrics.GaugeValue, | ||
| float64(*s.Memory.WorkingSetBytes), s.Name, pod.PodRef.Name, pod.PodRef.Namespace)) | ||
| } | ||
|
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| func (rc *resourceMetricsCollector) collectPodCPUMetrics(ch chan<- compbasemetrics.Metric, pod stats.PodStats) { | ||
| if pod.CPU == nil || pod.CPU.UsageCoreNanoSeconds == nil { | ||
| return | ||
| } | ||
|
|
||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(pod.CPU.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(podCPUUsageDesc, compbasemetrics.CounterValue, | ||
| float64(*pod.CPU.UsageCoreNanoSeconds)/float64(time.Second), pod.PodRef.Name, pod.PodRef.Namespace)) | ||
| } | ||
|
|
||
| func (rc *resourceMetricsCollector) collectPodMemoryMetrics(ch chan<- compbasemetrics.Metric, pod stats.PodStats) { | ||
| if pod.Memory == nil || pod.Memory.WorkingSetBytes == nil { | ||
| return | ||
| } | ||
|
|
||
| ch <- compbasemetrics.NewLazyMetricWithTimestamp(pod.Memory.Time.Time, | ||
| compbasemetrics.NewLazyConstMetric(podMemoryUsageDesc, compbasemetrics.GaugeValue, | ||
| float64(*pod.Memory.WorkingSetBytes), pod.PodRef.Name, pod.PodRef.Namespace)) | ||
| } |
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