/
collector.go
106 lines (92 loc) · 2.57 KB
/
collector.go
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package pkg
import (
"sync"
"github.com/prometheus/client_golang/prometheus"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/api/resource"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/metrics/pkg/client/clientset/versioned"
)
type KubeMetricsCollector struct {
logger *zap.Logger
clientset *versioned.Clientset
mu *sync.RWMutex
namespaces []string
}
func NewKubeMetricsCollector(logger *zap.Logger, clientset *versioned.Clientset, mu *sync.RWMutex) *KubeMetricsCollector {
return &KubeMetricsCollector{
logger: logger,
clientset: clientset,
mu: mu,
}
}
const (
LabelNamespace = "namespace"
LabelPod = "pod"
LabelContainer = "container"
)
var (
CommonLabels = []string{LabelNamespace, LabelPod, LabelContainer}
DescCpuUsage = prometheus.NewDesc("container_cpu_usage_cores", "CPU cores used", CommonLabels, nil)
DescMemUsage = prometheus.NewDesc("container_memory_usage_bytes", "memory used", CommonLabels, nil)
)
func (c *KubeMetricsCollector) Describe(descs chan<- *prometheus.Desc) {
descs <- DescCpuUsage
descs <- DescMemUsage
}
func (c *KubeMetricsCollector) UpdateNamespaces(namespaces []string) {
c.mu.Lock()
c.namespaces = namespaces
c.mu.Unlock()
}
func (c *KubeMetricsCollector) Collect(metrics chan<- prometheus.Metric) {
c.mu.RLock()
namespaces := c.namespaces
c.mu.RUnlock()
for _, namespace := range namespaces {
podMetricsAccessor := c.clientset.MetricsV1beta1().PodMetricses(namespace)
podMetricsList, err := podMetricsAccessor.List(v1.ListOptions{})
if err != nil {
c.logger.Warn(
"failed to list kube-metrics",
zap.String("namespace", namespace),
zap.Error(err))
continue
}
for _, p := range podMetricsList.Items {
podName := p.Name
for _, container := range p.Containers {
containerName := container.Name
// matching the units reported by kubectl top pods
cpuUsage := container.Usage.Cpu().ScaledValue(resource.Milli)
memUsage := container.Usage.Memory().Value()
metric, err := prometheus.NewConstMetric(
DescCpuUsage,
prometheus.GaugeValue,
float64(cpuUsage)/1000,
// labels
namespace,
podName,
containerName)
if err != nil {
c.logger.Warn("failed to create metric", zap.Error(err))
} else {
metrics <- metric
}
metric, err = prometheus.NewConstMetric(
DescMemUsage,
prometheus.GaugeValue,
float64(memUsage),
// labels
namespace,
podName,
containerName)
if err != nil {
c.logger.Warn("failed to create metric", zap.Error(err))
} else {
metrics <- metric
}
}
}
}
}