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scraper.go
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scraper.go
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// Copyright 2020, OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http:https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kubeletstatsreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver"
import (
"context"
"fmt"
"time"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.opentelemetry.io/collector/pdata/pmetric"
"go.opentelemetry.io/collector/receiver/scraperhelper"
"go.opentelemetry.io/collector/service/featuregate"
"go.uber.org/zap"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver/internal/kubelet"
"github.com/open-telemetry/opentelemetry-collector-contrib/receiver/kubeletstatsreceiver/internal/metadata"
)
const (
emitMetricsWithDirectionAttributeFeatureGateID = "receiver.kubeletstatsreceiver.emitMetricsWithDirectionAttribute"
emitMetricsWithoutDirectionAttributeFeatureGateID = "receiver.kubeletstatsreceiver.emitMetricsWithoutDirectionAttribute"
)
var (
emitMetricsWithDirectionAttributeFeatureGate = featuregate.Gate{
ID: emitMetricsWithDirectionAttributeFeatureGateID,
Enabled: true,
Description: "Some kubeletstats metrics reported are transitioning from being reported with a direction " +
"attribute to being reported with the direction included in the metric name to adhere to the " +
"OpenTelemetry specification. This feature gate controls emitting the old metrics with the direction " +
"attribute. For more details, see: " +
"https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/kubeletstatsreceiver/README.md#feature-gate-configurations",
}
emitMetricsWithoutDirectionAttributeFeatureGate = featuregate.Gate{
ID: emitMetricsWithoutDirectionAttributeFeatureGateID,
Enabled: false,
Description: "Some kubeletstats metrics reported are transitioning from being reported with a direction " +
"attribute to being reported with the direction included in the metric name to adhere to the " +
"OpenTelemetry specification. This feature gate controls emitting the new metrics without the direction " +
"attribute. For more details, see: " +
"https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/receiver/kubeletstatsreceiver/README.md#feature-gate-configurations",
}
)
func init() {
featuregate.GetRegistry().MustRegister(emitMetricsWithDirectionAttributeFeatureGate)
featuregate.GetRegistry().MustRegister(emitMetricsWithoutDirectionAttributeFeatureGate)
}
type scraperOptions struct {
id config.ComponentID
collectionInterval time.Duration
extraMetadataLabels []kubelet.MetadataLabel
metricGroupsToCollect map[kubelet.MetricGroup]bool
k8sAPIClient kubernetes.Interface
}
type kubletScraper struct {
statsProvider *kubelet.StatsProvider
metadataProvider *kubelet.MetadataProvider
logger *zap.Logger
extraMetadataLabels []kubelet.MetadataLabel
metricGroupsToCollect map[kubelet.MetricGroup]bool
k8sAPIClient kubernetes.Interface
cachedVolumeLabels map[string][]metadata.ResourceMetricsOption
mbs *metadata.MetricsBuilders
emitMetricsWithDirectionAttribute bool
emitMetricsWithoutDirectionAttribute bool
}
func newKubletScraper(
restClient kubelet.RestClient,
set component.ReceiverCreateSettings,
rOptions *scraperOptions,
metricsConfig metadata.MetricsSettings,
) (scraperhelper.Scraper, error) {
ks := &kubletScraper{
statsProvider: kubelet.NewStatsProvider(restClient),
metadataProvider: kubelet.NewMetadataProvider(restClient),
logger: set.Logger,
extraMetadataLabels: rOptions.extraMetadataLabels,
metricGroupsToCollect: rOptions.metricGroupsToCollect,
k8sAPIClient: rOptions.k8sAPIClient,
cachedVolumeLabels: make(map[string][]metadata.ResourceMetricsOption),
mbs: &metadata.MetricsBuilders{
NodeMetricsBuilder: metadata.NewMetricsBuilder(metricsConfig, set.BuildInfo),
PodMetricsBuilder: metadata.NewMetricsBuilder(metricsConfig, set.BuildInfo),
ContainerMetricsBuilder: metadata.NewMetricsBuilder(metricsConfig, set.BuildInfo),
OtherMetricsBuilder: metadata.NewMetricsBuilder(metricsConfig, set.BuildInfo),
},
emitMetricsWithDirectionAttribute: featuregate.GetRegistry().IsEnabled(emitMetricsWithDirectionAttributeFeatureGateID),
emitMetricsWithoutDirectionAttribute: featuregate.GetRegistry().IsEnabled(emitMetricsWithoutDirectionAttributeFeatureGateID),
}
return scraperhelper.NewScraper(typeStr, ks.scrape)
}
func (r *kubletScraper) scrape(context.Context) (pmetric.Metrics, error) {
summary, err := r.statsProvider.StatsSummary()
if err != nil {
r.logger.Error("call to /stats/summary endpoint failed", zap.Error(err))
return pmetric.Metrics{}, err
}
var podsMetadata *v1.PodList
// fetch metadata only when extra metadata labels are needed
if len(r.extraMetadataLabels) > 0 {
podsMetadata, err = r.metadataProvider.Pods()
if err != nil {
r.logger.Error("call to /pods endpoint failed", zap.Error(err))
return pmetric.Metrics{}, err
}
}
metadata := kubelet.NewMetadata(r.extraMetadataLabels, podsMetadata, r.detailedPVCLabelsSetter())
mds := kubelet.MetricsData(r.logger, summary, metadata, r.metricGroupsToCollect, r.mbs, r.emitMetricsWithDirectionAttribute, r.emitMetricsWithoutDirectionAttribute)
md := pmetric.NewMetrics()
for i := range mds {
mds[i].ResourceMetrics().MoveAndAppendTo(md.ResourceMetrics())
}
return md, nil
}
func (r *kubletScraper) detailedPVCLabelsSetter() func(volCacheID, volumeClaim, namespace string) ([]metadata.ResourceMetricsOption, error) {
return func(volCacheID, volumeClaim, namespace string) ([]metadata.ResourceMetricsOption, error) {
if r.k8sAPIClient == nil {
return nil, nil
}
if r.cachedVolumeLabels[volCacheID] == nil {
ctx := context.Background()
pvc, err := r.k8sAPIClient.CoreV1().PersistentVolumeClaims(namespace).Get(ctx, volumeClaim, metav1.GetOptions{})
if err != nil {
return nil, err
}
volName := pvc.Spec.VolumeName
if volName == "" {
return nil, fmt.Errorf("PersistentVolumeClaim %s does not have a volume name", pvc.Name)
}
pv, err := r.k8sAPIClient.CoreV1().PersistentVolumes().Get(ctx, volName, metav1.GetOptions{})
if err != nil {
return nil, err
}
ro := kubelet.GetPersistentVolumeLabels(pv.Spec.PersistentVolumeSource)
// Cache collected labels.
r.cachedVolumeLabels[volCacheID] = ro
}
return r.cachedVolumeLabels[volCacheID], nil
}
}