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cadvisor.go
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cadvisor.go
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//go:build linux
package cadvisor //nolint:golint
import (
"context"
"fmt"
"net/http"
"strings"
"time"
"github.com/go-kit/log"
"github.com/google/cadvisor/cache/memory"
"github.com/google/cadvisor/container"
v2 "github.com/google/cadvisor/info/v2"
"github.com/google/cadvisor/manager"
"github.com/google/cadvisor/metrics"
"github.com/google/cadvisor/storage"
"github.com/google/cadvisor/utils/sysfs"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
"github.com/grafana/alloy/internal/static/integrations"
// Register container providers
"github.com/google/cadvisor/container/containerd"
"github.com/google/cadvisor/container/crio"
"github.com/google/cadvisor/container/docker"
"github.com/google/cadvisor/container/raw"
"github.com/google/cadvisor/container/systemd"
)
// Matching the default disabled set from cadvisor - https://github.com/google/cadvisor/blob/3c6e3093c5ca65c57368845ddaea2b4ca6bc0da8/cmd/cadvisor.go#L78-L93
// Note: This *could* be kept in sync with upstream by using the following. However, that would require importing the github.com/google/cadvisor/cmd package, which introduces some dependency conflicts that weren't worth the hassle IMHO.
// var disabledMetrics = *flag.Lookup("disable_metrics").Value.(*container.MetricSet)
var disabledMetrics = container.MetricSet{
container.MemoryNumaMetrics: struct{}{},
container.NetworkTcpUsageMetrics: struct{}{},
container.NetworkUdpUsageMetrics: struct{}{},
container.NetworkAdvancedTcpUsageMetrics: struct{}{},
container.ProcessSchedulerMetrics: struct{}{},
container.ProcessMetrics: struct{}{},
container.HugetlbUsageMetrics: struct{}{},
container.ReferencedMemoryMetrics: struct{}{},
container.CPUTopologyMetrics: struct{}{},
container.ResctrlMetrics: struct{}{},
container.CPUSetMetrics: struct{}{},
}
// GetIncludedMetrics applies some logic to determine the final set of metrics to be scraped and returned by the cAdvisor integration
func (c *Config) GetIncludedMetrics() (container.MetricSet, error) {
var enabledMetrics, includedMetrics container.MetricSet
if c.DisabledMetrics != nil {
if err := disabledMetrics.Set(strings.Join(c.DisabledMetrics, ",")); err != nil {
return includedMetrics, fmt.Errorf("failed to set disabled metrics: %w", err)
}
}
if c.EnabledMetrics != nil {
if err := enabledMetrics.Set(strings.Join(c.EnabledMetrics, ",")); err != nil {
return includedMetrics, fmt.Errorf("failed to set enabled metrics: %w", err)
}
}
if len(enabledMetrics) > 0 {
includedMetrics = enabledMetrics
} else {
includedMetrics = container.AllMetrics.Difference(disabledMetrics)
}
return includedMetrics, nil
}
// NewIntegration creates a new cadvisor integration
func (c *Config) NewIntegration(logger log.Logger) (integrations.Integration, error) {
return New(logger, c)
}
// New creates a new cadvisor integration
func New(logger log.Logger, c *Config) (integrations.Integration, error) {
c.logger = logger
// Do gross global configs. This works, so long as there is only one instance of the cAdvisor integration
// per host.
klog.SetLogger(c.logger)
plugins := map[string]container.Plugin{
"containerd": containerd.NewPluginWithOptions(&containerd.Options{
ContainerdEndpoint: c.Containerd,
ContainerdNamespace: c.ContainerdNamespace,
}),
"crio": crio.NewPlugin(),
"docker": docker.NewPluginWithOptions(&docker.Options{
DockerEndpoint: c.Docker,
DockerTLS: c.DockerTLS,
DockerCert: c.DockerTLSCert,
DockerKey: c.DockerTLSKey,
DockerCA: c.DockerTLSCA,
}),
"systemd": systemd.NewPlugin(),
}
// Only using in-memory storage, with no backup storage for cadvisor stats
memoryStorage := memory.New(c.StorageDuration, []storage.StorageDriver{})
sysFs := sysfs.NewRealSysFs()
var collectorHTTPClient http.Client
includedMetrics, err := c.GetIncludedMetrics()
if err != nil {
return nil, fmt.Errorf("unable to determine included metrics: %w", err)
}
rawOpts := raw.Options{
DockerOnly: c.DockerOnly,
DisableRootCgroupStats: c.DisableRootCgroupStats,
}
rm, err := manager.New(plugins, memoryStorage, sysFs, manager.HousekeepingConfigFlags, includedMetrics, &collectorHTTPClient, c.RawCgroupPrefixAllowlist, c.EnvMetadataAllowlist, c.PerfEventsConfig, time.Duration(c.ResctrlInterval), rawOpts)
if err != nil {
return nil, fmt.Errorf("failed to create a manager: %w", err)
}
if err := rm.Start(); err != nil {
return nil, fmt.Errorf("failed to start manager: %w", err)
}
containerLabelFunc := metrics.DefaultContainerLabels
if !c.StoreContainerLabels {
containerLabelFunc = metrics.BaseContainerLabels(c.AllowlistedContainerLabels)
}
machCol := metrics.NewPrometheusMachineCollector(rm, includedMetrics)
// This is really just a concatenation of the defaults found at;
// https://github.com/google/cadvisor/tree/f89291a53b80b2c3659fff8954c11f1fc3de8a3b/cmd/internal/api/versions.go#L536-L540
// https://github.com/google/cadvisor/tree/f89291a53b80b2c3659fff8954c11f1fc3de8a3b/cmd/internal/http/handlers.go#L109-L110
// AFAIK all we are ever doing is the "default" metrics request, and we don't need to support the "docker" request type.
reqOpts := v2.RequestOptions{
IdType: v2.TypeName,
Count: 1,
Recursive: true,
}
contCol := metrics.NewPrometheusCollector(rm, containerLabelFunc, includedMetrics, clock.RealClock{}, reqOpts)
start := func(ctx context.Context) error {
<-ctx.Done()
if err := rm.Stop(); err != nil {
return fmt.Errorf("failed to stop manager: %w", err)
}
return nil
}
ci := integrations.NewCollectorIntegration(
c.Name(),
integrations.WithRunner(start),
integrations.WithCollectors(machCol, contCol),
)
return ci, nil
}