119 lines
3.8 KiB
Go
119 lines
3.8 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package stats
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import (
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"time"
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"k8s.io/klog"
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stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
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"github.com/prometheus/client_golang/prometheus"
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)
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// NodeResourceMetric describes a metric for the node
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type NodeResourceMetric struct {
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Name string
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Description string
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ValueFn func(stats.NodeStats) (*float64, time.Time)
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}
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func (n *NodeResourceMetric) desc() *prometheus.Desc {
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return prometheus.NewDesc(n.Name, n.Description, []string{}, nil)
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}
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// ContainerResourceMetric describes a metric for containers
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type ContainerResourceMetric struct {
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Name string
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Description string
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ValueFn func(stats.ContainerStats) (*float64, time.Time)
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}
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func (n *ContainerResourceMetric) desc() *prometheus.Desc {
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return prometheus.NewDesc(n.Name, n.Description, []string{"container", "pod", "namespace"}, nil)
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}
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// ResourceMetricsConfig specifies which metrics to collect and export
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type ResourceMetricsConfig struct {
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NodeMetrics []NodeResourceMetric
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ContainerMetrics []ContainerResourceMetric
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}
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// NewPrometheusResourceMetricCollector returns a prometheus.Collector which exports resource metrics
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func NewPrometheusResourceMetricCollector(provider SummaryProvider, config ResourceMetricsConfig) prometheus.Collector {
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return &resourceMetricCollector{
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provider: provider,
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config: config,
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errors: prometheus.NewGauge(prometheus.GaugeOpts{
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Name: "scrape_error",
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Help: "1 if there was an error while getting container metrics, 0 otherwise",
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}),
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}
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}
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type resourceMetricCollector struct {
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provider SummaryProvider
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config ResourceMetricsConfig
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errors prometheus.Gauge
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}
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var _ prometheus.Collector = &resourceMetricCollector{}
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// Describe implements prometheus.Collector
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func (rc *resourceMetricCollector) Describe(ch chan<- *prometheus.Desc) {
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rc.errors.Describe(ch)
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for _, metric := range rc.config.NodeMetrics {
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ch <- metric.desc()
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}
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for _, metric := range rc.config.ContainerMetrics {
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ch <- metric.desc()
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}
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}
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// Collect implements prometheus.Collector
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// Since new containers are frequently created and removed, using the prometheus.Gauge Collector would
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// leak metric collectors for containers or pods that no longer exist. Instead, implement
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// prometheus.Collector in a way that only collects metrics for active containers.
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func (rc *resourceMetricCollector) Collect(ch chan<- prometheus.Metric) {
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rc.errors.Set(0)
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defer rc.errors.Collect(ch)
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summary, err := rc.provider.GetCPUAndMemoryStats()
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if err != nil {
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rc.errors.Set(1)
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klog.Warningf("Error getting summary for resourceMetric prometheus endpoint: %v", err)
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return
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}
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for _, metric := range rc.config.NodeMetrics {
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if value, timestamp := metric.ValueFn(summary.Node); value != nil {
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ch <- prometheus.NewMetricWithTimestamp(timestamp,
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prometheus.MustNewConstMetric(metric.desc(), prometheus.GaugeValue, *value))
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}
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}
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for _, pod := range summary.Pods {
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for _, container := range pod.Containers {
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for _, metric := range rc.config.ContainerMetrics {
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if value, timestamp := metric.ValueFn(container); value != nil {
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ch <- prometheus.NewMetricWithTimestamp(timestamp,
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prometheus.MustNewConstMetric(metric.desc(), prometheus.GaugeValue, *value, container.Name, pod.PodRef.Name, pod.PodRef.Namespace))
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}
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}
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}
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}
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}
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