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# Kubelet


<img src="https://netdata.cloud/img/kubernetes.svg" width="150"/>


Plugin: go.d.plugin
Module: k8s_kubelet

<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />

## Overview

This collector monitors Kubelet instances.




This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.


### Default Behavior

#### Auto-Detection

This integration doesn't support auto-detection.

#### Limits

The default configuration for this integration does not impose any limits on data collection.

#### Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.


## Metrics

Metrics grouped by *scope*.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.



### Per Kubelet instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| k8s_kubelet.apiserver_audit_requests_rejected | rejected | requests/s |
| k8s_kubelet.apiserver_storage_data_key_generation_failures | failures | events/s |
| k8s_kubelet.apiserver_storage_data_key_generation_latencies | 5_µs, 10_µs, 20_µs, 40_µs, 80_µs, 160_µs, 320_µs, 640_µs, 1280_µs, 2560_µs, 5120_µs, 10240_µs, 20480_µs, 40960_µs, +Inf | observes/s |
| k8s_kubelet.apiserver_storage_data_key_generation_latencies_percent | 5_µs, 10_µs, 20_µs, 40_µs, 80_µs, 160_µs, 320_µs, 640_µs, 1280_µs, 2560_µs, 5120_µs, 10240_µs, 20480_µs, 40960_µs, +Inf | percentage |
| k8s_kubelet.apiserver_storage_envelope_transformation_cache_misses | cache misses | events/s |
| k8s_kubelet.kubelet_containers_running | total | running_containers |
| k8s_kubelet.kubelet_pods_running | total | running_pods |
| k8s_kubelet.kubelet_pods_log_filesystem_used_bytes | a dimension per namespace and pod | B |
| k8s_kubelet.kubelet_runtime_operations | a dimension per operation type | operations/s |
| k8s_kubelet.kubelet_runtime_operations_errors | a dimension per operation type | errors/s |
| k8s_kubelet.kubelet_docker_operations | a dimension per operation type | operations/s |
| k8s_kubelet.kubelet_docker_operations_errors | a dimension per operation type | errors/s |
| k8s_kubelet.kubelet_node_config_error | experiencing_error | bool |
| k8s_kubelet.kubelet_pleg_relist_interval_microseconds | 0.5, 0.9, 0.99 | microseconds |
| k8s_kubelet.kubelet_pleg_relist_latency_microseconds | 0.5, 0.9, 0.99 | microseconds |
| k8s_kubelet.kubelet_token_requests | total, failed | token_requests/s |
| k8s_kubelet.rest_client_requests_by_code | a dimension per HTTP status code | requests/s |
| k8s_kubelet.rest_client_requests_by_method | a dimension per HTTP method | requests/s |

### Per volume manager

These metrics refer to the Volume Manager.

This scope has no labels.

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| k8s_kubelet.volume_manager_total_volumes | actual, desired | state |



## Alerts


The following alerts are available:

| Alert name  | On metric | Description |
|:------------|:----------|:------------|
| [ kubelet_node_config_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/kubelet.conf) | k8s_kubelet.kubelet_node_config_error | the node is experiencing a configuration-related error (0: false, 1: true) |
| [ kubelet_token_requests ](https://github.com/netdata/netdata/blob/master/src/health/health.d/kubelet.conf) | k8s_kubelet.kubelet_token_requests | number of failed Token() requests to the alternate token source |
| [ kubelet_token_requests ](https://github.com/netdata/netdata/blob/master/src/health/health.d/kubelet.conf) | k8s_kubelet.kubelet_token_requests | number of failed Token() requests to the alternate token source |
| [ kubelet_operations_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/kubelet.conf) | k8s_kubelet.kubelet_operations_errors | number of Docker or runtime operation errors |
| [ kubelet_operations_error ](https://github.com/netdata/netdata/blob/master/src/health/health.d/kubelet.conf) | k8s_kubelet.kubelet_operations_errors | number of Docker or runtime operation errors |


## Setup

### Prerequisites

No action required.

### Configuration

#### File

The configuration file name for this integration is `go.d/k8s_kubelet.conf`.


You can edit the configuration file using the `edit-config` script from the
Netdata [config directory](/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).

```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/k8s_kubelet.conf
```
#### Options

The following options can be defined globally: update_every, autodetection_retry.


<details open><summary>Config options</summary>

| Name | Description | Default | Required |
|:----|:-----------|:-------|:--------:|
| update_every | Data collection frequency. | 1 | no |
| autodetection_retry | Recheck interval in seconds. Zero means no recheck will be scheduled. | 0 | no |
| url | Server URL. | http://127.0.0.1:10255/metrics | yes |
| timeout | HTTP request timeout. | 1 | no |
| username | Username for basic HTTP authentication. |  | no |
| password | Password for basic HTTP authentication. |  | no |
| proxy_url | Proxy URL. |  | no |
| proxy_username | Username for proxy basic HTTP authentication. |  | no |
| proxy_password | Password for proxy basic HTTP authentication. |  | no |
| method | HTTP request method. | GET | no |
| body | HTTP request body. |  | no |
| headers | HTTP request headers. |  | no |
| not_follow_redirects | Redirect handling policy. Controls whether the client follows redirects. | no | no |
| tls_skip_verify | Server certificate chain and hostname validation policy. Controls whether the client performs this check. | no | no |
| tls_ca | Certification authority that the client uses when verifying the server's certificates. |  | no |
| tls_cert | Client TLS certificate. |  | no |
| tls_key | Client TLS key. |  | no |

</details>

#### Examples

##### Basic

A basic example configuration.

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:10255/metrics

```
##### HTTPS with self-signed certificate

Do not validate server certificate chain and hostname.


<details open><summary>Config</summary>

```yaml
jobs:
  - name: local
    url: http://127.0.0.1:10250/metrics
    tls_skip_verify: yes

```
</details>



## Troubleshooting

### Debug Mode

**Important**: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

To troubleshoot issues with the `k8s_kubelet` collector, run the `go.d.plugin` with the debug option enabled. The output
should give you clues as to why the collector isn't working.

- Navigate to the `plugins.d` directory, usually at `/usr/libexec/netdata/plugins.d/`. If that's not the case on
  your system, open `netdata.conf` and look for the `plugins` setting under `[directories]`.

  ```bash
  cd /usr/libexec/netdata/plugins.d/
  ```

- Switch to the `netdata` user.

  ```bash
  sudo -u netdata -s
  ```

- Run the `go.d.plugin` to debug the collector:

  ```bash
  ./go.d.plugin -d -m k8s_kubelet
  ```

### Getting Logs

If you're encountering problems with the `k8s_kubelet` collector, follow these steps to retrieve logs and identify potential issues:

- **Run the command** specific to your system (systemd, non-systemd, or Docker container).
- **Examine the output** for any warnings or error messages that might indicate issues.  These messages should provide clues about the root cause of the problem.

#### System with systemd

Use the following command to view logs generated since the last Netdata service restart:

```bash
journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep k8s_kubelet
```

#### System without systemd

Locate the collector log file, typically at `/var/log/netdata/collector.log`, and use `grep` to filter for collector's name:

```bash
grep k8s_kubelet /var/log/netdata/collector.log
```

**Note**: This method shows logs from all restarts. Focus on the **latest entries** for troubleshooting current issues.

#### Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

```bash
docker logs netdata 2>&1 | grep k8s_kubelet
```


