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// SPDX-License-Identifier: GPL-3.0-or-later
package k8s_kubelet
import (
_ "embed"
"errors"
"time"
"github.com/netdata/netdata/go/go.d.plugin/agent/module"
"github.com/netdata/netdata/go/go.d.plugin/pkg/prometheus"
"github.com/netdata/netdata/go/go.d.plugin/pkg/web"
)
//go:embed "config_schema.json"
var configSchema string
func init() {
module.Register("k8s_kubelet", module.Creator{
JobConfigSchema: configSchema,
Defaults: module.Defaults{
// NETDATA_CHART_PRIO_CGROUPS_CONTAINERS 40000
Priority: 50000,
},
Create: func() module.Module { return New() },
})
}
func New() *Kubelet {
return &Kubelet{
Config: Config{
HTTP: web.HTTP{
Request: web.Request{
URL: "http://127.0.0.1:10255/metrics",
Headers: make(map[string]string),
},
Client: web.Client{
Timeout: web.Duration(time.Second),
},
},
TokenPath: "/var/run/secrets/kubernetes.io/serviceaccount/token",
},
charts: charts.Copy(),
collectedVMPlugins: make(map[string]bool),
}
}
type Config struct {
web.HTTP `yaml:",inline" json:""`
UpdateEvery int `yaml:"update_every" json:"update_every"`
TokenPath string `yaml:"token_path" json:"token_path"`
}
type Kubelet struct {
module.Base
Config `yaml:",inline" json:""`
charts *Charts
prom prometheus.Prometheus
collectedVMPlugins map[string]bool // volume_manager_total_volumes
}
func (k *Kubelet) Configuration() any {
return k.Config
}
func (k *Kubelet) Init() error {
if err := k.validateConfig(); err != nil {
k.Errorf("config validation: %v", err)
return err
}
prom, err := k.initPrometheusClient()
if err != nil {
k.Error(err)
return err
}
k.prom = prom
if tok := k.initAuthToken(); tok != "" {
k.Request.Headers["Authorization"] = "Bearer " + tok
}
return nil
}
func (k *Kubelet) Check() error {
mx, err := k.collect()
if err != nil {
k.Error(err)
return err
}
if len(mx) == 0 {
return errors.New("no metrics collected")
}
return nil
}
func (k *Kubelet) Charts() *Charts {
return k.charts
}
func (k *Kubelet) Collect() map[string]int64 {
mx, err := k.collect()
if err != nil {
k.Error(err)
return nil
}
return mx
}
func (k *Kubelet) Cleanup() {
if k.prom != nil && k.prom.HTTPClient() != nil {
k.prom.HTTPClient().CloseIdleConnections()
}
}
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