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metrics.go
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metrics.go
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package azure
import (
"context"
"strings"
"time"
"github.com/cpuguy83/strongerrors/status/ocstatus"
"github.com/pkg/errors"
"github.com/virtual-kubelet/virtual-kubelet/providers/azure/client/aci"
"go.opencensus.io/trace"
"golang.org/x/sync/errgroup"
"k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
)
// GetStatsSummary returns the stats summary for pods running on ACI
func (p *ACIProvider) GetStatsSummary(ctx context.Context) (summary *stats.Summary, err error) {
ctx, span := trace.StartSpan(ctx, "GetSummaryStats")
defer span.End()
addAzureAttributes(span, p)
p.metricsSync.Lock()
defer p.metricsSync.Unlock()
span.Annotate(nil, "acquired metrics mutex")
if time.Now().Sub(p.metricsSyncTime) < time.Minute {
span.AddAttributes(trace.BoolAttribute("preCachedResult", true), trace.StringAttribute("cachedResultSampleTime", p.metricsSyncTime.String()))
return p.lastMetric, nil
}
span.AddAttributes(trace.BoolAttribute("preCachedResult", false), trace.StringAttribute("cachedResultSampleTime", p.metricsSyncTime.String()))
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
defer func() {
if err != nil {
return
}
p.lastMetric = summary
p.metricsSyncTime = time.Now()
}()
pods := p.resourceManager.GetPods()
var errGroup errgroup.Group
chResult := make(chan stats.PodStats, len(pods))
end := time.Now()
start := end.Add(-1 * time.Minute)
sema := make(chan struct{}, 10)
for _, pod := range pods {
if pod.Status.Phase != v1.PodRunning {
continue
}
pod := pod
errGroup.Go(func() error {
ctx, span := trace.StartSpan(ctx, "getPodMetrics")
defer span.End()
span.AddAttributes(
trace.StringAttribute("UID", string(pod.UID)),
trace.StringAttribute("Name", pod.Name),
trace.StringAttribute("Namespace", pod.Namespace),
)
select {
case <-ctx.Done():
return ctx.Err()
case sema <- struct{}{}:
}
defer func() {
<-sema
}()
span.Annotate(nil, "Acquired semaphore")
cgName := containerGroupName(pod)
// cpu/mem and net stats are split because net stats do not support container level detail
systemStats, err := p.aciClient.GetContainerGroupMetrics(ctx, p.resourceGroup, cgName, aci.MetricsRequest{
Dimension: "containerName eq '*'",
Start: start,
End: end,
Aggregations: []aci.AggregationType{aci.AggregationTypeAverage},
Types: []aci.MetricType{aci.MetricTypeCPUUsage, aci.MetricTypeMemoryUsage},
})
if err != nil {
span.SetStatus(ocstatus.FromError(err))
return errors.Wrapf(err, "error fetching cpu/mem stats for container group %s", cgName)
}
span.Annotate(nil, "Got system stats")
netStats, err := p.aciClient.GetContainerGroupMetrics(ctx, p.resourceGroup, cgName, aci.MetricsRequest{
Start: start,
End: end,
Aggregations: []aci.AggregationType{aci.AggregationTypeAverage},
Types: []aci.MetricType{aci.MetricTyperNetworkBytesRecievedPerSecond, aci.MetricTyperNetworkBytesTransmittedPerSecond},
})
if err != nil {
span.SetStatus(ocstatus.FromError(err))
return errors.Wrapf(err, "error fetching network stats for container group %s", cgName)
}
span.Annotate(nil, "Got network stats")
chResult <- collectMetrics(pod, systemStats, netStats)
return nil
})
}
if err := errGroup.Wait(); err != nil {
return nil, errors.Wrap(err, "error in request to fetch container group metrics")
}
close(chResult)
span.Annotate([]trace.Attribute{trace.Int64Attribute("nPods", int64(len(pods)))}, "Collected stats from Azure")
var s stats.Summary
s.Node = stats.NodeStats{
NodeName: p.nodeName,
}
s.Pods = make([]stats.PodStats, 0, len(chResult))
for stat := range chResult {
s.Pods = append(s.Pods, stat)
}
return &s, nil
}
func collectMetrics(pod *v1.Pod, system, net *aci.ContainerGroupMetricsResult) stats.PodStats {
var stat stats.PodStats
containerStats := make(map[string]*stats.ContainerStats, len(pod.Status.ContainerStatuses))
stat.StartTime = pod.CreationTimestamp
for _, m := range system.Value {
// cpu/mem stats are per container, so each entry in the time series is for a container, not the container group.
for _, entry := range m.Timeseries {
if len(entry.Data) == 0 {
continue
}
var cs *stats.ContainerStats
for _, v := range entry.MetadataValues {
if strings.ToLower(v.Name.Value) != "containername" {
continue
}
if cs = containerStats[v.Value]; cs == nil {
cs = &stats.ContainerStats{Name: v.Value, StartTime: stat.StartTime}
containerStats[v.Value] = cs
}
}
if cs == nil {
continue
}
if stat.Containers == nil {
stat.Containers = make([]stats.ContainerStats, 0, len(containerStats))
}
data := entry.Data[len(entry.Data)-1] // get only the last entry
switch m.Desc.Value {
case aci.MetricTypeCPUUsage:
if cs.CPU == nil {
cs.CPU = &stats.CPUStats{}
}
// average is the average number of millicores over a 1 minute interval (which is the interval we are pulling the stats for)
nanoCores := uint64(data.Average * 1000000)
usageNanoSeconds := nanoCores * 60
cs.CPU.Time = metav1.NewTime(data.Timestamp)
cs.CPU.UsageCoreNanoSeconds = &usageNanoSeconds
cs.CPU.UsageNanoCores = &nanoCores
if stat.CPU == nil {
var zero uint64
stat.CPU = &stats.CPUStats{UsageNanoCores: &zero, UsageCoreNanoSeconds: &zero, Time: metav1.NewTime(data.Timestamp)}
}
podCPUSec := *stat.CPU.UsageCoreNanoSeconds
podCPUSec += usageNanoSeconds
stat.CPU.UsageCoreNanoSeconds = &podCPUSec
podCPUCore := *stat.CPU.UsageNanoCores
podCPUCore += nanoCores
stat.CPU.UsageNanoCores = &podCPUCore
case aci.MetricTypeMemoryUsage:
if cs.Memory == nil {
cs.Memory = &stats.MemoryStats{}
}
cs.Memory.Time = metav1.NewTime(data.Timestamp)
bytes := uint64(data.Average)
cs.Memory.UsageBytes = &bytes
cs.Memory.WorkingSetBytes = &bytes
if stat.Memory == nil {
var zero uint64
stat.Memory = &stats.MemoryStats{UsageBytes: &zero, WorkingSetBytes: &zero, Time: metav1.NewTime(data.Timestamp)}
}
podMem := *stat.Memory.UsageBytes
podMem += bytes
stat.Memory.UsageBytes = &podMem
stat.Memory.WorkingSetBytes = &podMem
}
}
}
for _, m := range net.Value {
if stat.Network == nil {
stat.Network = &stats.NetworkStats{}
}
// network stats are for the whole container group, so there should only be one entry here.
if len(m.Timeseries) == 0 {
continue
}
entry := m.Timeseries[0]
if len(entry.Data) == 0 {
continue
}
data := entry.Data[len(entry.Data)-1] // get only the last entry
bytes := uint64(data.Average)
switch m.Desc.Value {
case aci.MetricTyperNetworkBytesRecievedPerSecond:
stat.Network.RxBytes = &bytes
case aci.MetricTyperNetworkBytesTransmittedPerSecond:
stat.Network.TxBytes = &bytes
}
stat.Network.Time = metav1.NewTime(data.Timestamp)
stat.Network.InterfaceStats.Name = "eth0"
}
for _, cs := range containerStats {
stat.Containers = append(stat.Containers, *cs)
}
stat.PodRef = stats.PodReference{
Name: pod.Name,
Namespace: pod.Namespace,
UID: string(pod.UID),
}
return stat
}