123 lines
3.7 KiB
Go
123 lines
3.7 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/component-base/metrics"
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"k8s.io/klog"
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stats "k8s.io/kubernetes/pkg/kubelet/apis/stats/v1alpha1"
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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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Desc *metrics.Desc
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ValueFn func(stats.NodeStats) (*float64, time.Time)
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}
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func (n *NodeResourceMetric) desc() *metrics.Desc {
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return n.Desc
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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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Desc *metrics.Desc
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ValueFn func(stats.ContainerStats) (*float64, time.Time)
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}
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func (n *ContainerResourceMetric) desc() *metrics.Desc {
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return n.Desc
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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 metrics.StableCollector which exports resource metrics
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func NewPrometheusResourceMetricCollector(provider SummaryProvider, config ResourceMetricsConfig) metrics.StableCollector {
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return &resourceMetricCollector{
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provider: provider,
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config: config,
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errors: metrics.NewDesc("scrape_error",
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"1 if there was an error while getting container metrics, 0 otherwise",
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nil,
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nil,
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metrics.ALPHA,
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"1.18.0"),
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}
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}
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type resourceMetricCollector struct {
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metrics.BaseStableCollector
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provider SummaryProvider
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config ResourceMetricsConfig
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errors *metrics.Desc
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}
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var _ metrics.StableCollector = &resourceMetricCollector{}
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// DescribeWithStability implements metrics.StableCollector
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func (rc *resourceMetricCollector) DescribeWithStability(ch chan<- *metrics.Desc) {
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ch <- rc.errors
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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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// CollectWithStability implements metrics.StableCollector
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// Since new containers are frequently created and removed, using the Gauge would
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// leak metric collectors for containers or pods that no longer exist. Instead, implement
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// custom collector in a way that only collects metrics for active containers.
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func (rc *resourceMetricCollector) CollectWithStability(ch chan<- metrics.Metric) {
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var errorCount float64
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defer func() {
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ch <- metrics.NewLazyConstMetric(rc.errors, metrics.GaugeValue, errorCount)
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}()
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summary, err := rc.provider.GetCPUAndMemoryStats()
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if err != nil {
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errorCount = 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 <- metrics.NewLazyMetricWithTimestamp(timestamp,
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metrics.NewLazyConstMetric(metric.desc(), metrics.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 <- metrics.NewLazyMetricWithTimestamp(timestamp,
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metrics.NewLazyConstMetric(metric.desc(), metrics.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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