# Kubernetes

**Status**: [Development][DocumentStatus]

Useful resources to understand Kubernetes objects and metadata:

* [Namespace](https://kubernetes.io/docs/concepts/overview/working-with-objects/namespaces/)
* [Names and UIDs](https://kubernetes.io/docs/concepts/overview/working-with-objects/names/).
* [Pods](https://kubernetes.io/docs/concepts/workloads/pods/)
* [Controllers](https://kubernetes.io/docs/concepts/workloads/controllers/)

The "name" of a Kubernetes object is unique for that type of object within a
"namespace" and only at a specific moment of time (names can be reused over
time). The "uid" is unique across your whole cluster, and very likely across
time. Because of this it is recommended to always set the UID for every
Kubernetes object, but "name" is usually more user friendly so can be also set.

## Cluster

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.cluster`

**Description:** A Kubernetes Cluster.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.cluster.name`](/docs/attributes-registry/k8s.md) | string | The name of the cluster. | `opentelemetry-cluster` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.cluster.uid`](/docs/attributes-registry/k8s.md) | string | A pseudo-ID for the cluster, set to the UID of the `kube-system` namespace. [1] | `218fc5a9-a5f1-4b54-aa05-46717d0ab26d` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.cluster.uid`:** K8s doesn't have support for obtaining a cluster ID. If this is ever
added, we will recommend collecting the `k8s.cluster.uid` through the
official APIs. In the meantime, we are able to use the `uid` of the
`kube-system` namespace as a proxy for cluster ID. Read on for the
rationale.

Every object created in a K8s cluster is assigned a distinct UID. The
`kube-system` namespace is used by Kubernetes itself and will exist
for the lifetime of the cluster. Using the `uid` of the `kube-system`
namespace is a reasonable proxy for the K8s ClusterID as it will only
change if the cluster is rebuilt. Furthermore, Kubernetes UIDs are
UUIDs as standardized by
[ISO/IEC 9834-8 and ITU-T X.667](https://www.itu.int/ITU-T/studygroups/com17/oid.html).
Which states:

> If generated according to one of the mechanisms defined in Rec.
> ITU-T X.667 | ISO/IEC 9834-8, a UUID is either guaranteed to be
> different from all other UUIDs generated before 3603 A.D., or is
> extremely likely to be different (depending on the mechanism chosen).

Therefore, UIDs between clusters should be extremely unlikely to
conflict.

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## Node

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.node`

**Description:** A Kubernetes Node object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.node.name`](/docs/attributes-registry/k8s.md) | string | The name of the Node. | `node-1` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.node.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the Node. | `1eb3a0c6-0477-4080-a9cb-0cb7db65c6a2` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.node.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation placed on the Node, the `<key>` being the annotation name, the value being the annotation value, even if the value is empty. [1] | `0`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.node.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label placed on the Node, the `<key>` being the label name, the value being the label value, even if the value is empty. [2] | `arm64`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.node.annotation.<key>`:** Examples:

- An annotation `node.alpha.kubernetes.io/ttl` with value `0` SHOULD be recorded as
  the `k8s.node.annotation.node.alpha.kubernetes.io/ttl` attribute with value `"0"`.
- An annotation `data` with empty string value SHOULD be recorded as
  the `k8s.node.annotation.data` attribute with value `""`.

**[2] `k8s.node.label.<key>`:** Examples:

- A label `kubernetes.io/arch` with value `arm64` SHOULD be recorded
  as the `k8s.node.label.kubernetes.io/arch` attribute with value `"arm64"`.
- A label `data` with empty string value SHOULD be recorded as
  the `k8s.node.label.data` attribute with value `""`.

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## Namespace

Namespaces provide a scope for names. Names of objects need to be unique within
a namespace, but not across namespaces.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.namespace`

**Description:** A Kubernetes Namespace.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.namespace.name`](/docs/attributes-registry/k8s.md) | string | The name of the namespace that the pod is running in. | `default` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.namespace.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the Namespace. [1] | `k8s.namespace.annotation.ttl=0`; `k8s.namespace.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.namespace.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the Namespace. [2] | `k8s.namespace.label.kubernetes.io/metadata.name=default`; `k8s.namespace.label.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.namespace.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.namespace.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## Pod

The smallest and simplest Kubernetes object. A Pod represents a set of running
containers on your cluster.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.pod`

**Description:** A Kubernetes Pod object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.pod.name`](/docs/attributes-registry/k8s.md) | string | The name of the Pod. | `opentelemetry-pod-autoconf` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.pod.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the Pod. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.pod.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation placed on the Pod, the `<key>` being the annotation name, the value being the annotation value. [1] | `true`; `x64`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.pod.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label placed on the Pod, the `<key>` being the label name, the value being the label value. [2] | `my-app`; `x64`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.pod.annotation.<key>`:** Examples:

- An annotation `kubernetes.io/enforce-mountable-secrets` with value `true` SHOULD be recorded as
  the `k8s.pod.annotation.kubernetes.io/enforce-mountable-secrets` attribute with value `"true"`.
- An annotation `mycompany.io/arch` with value `x64` SHOULD be recorded as
  the `k8s.pod.annotation.mycompany.io/arch` attribute with value `"x64"`.
- An annotation `data` with empty string value SHOULD be recorded as
  the `k8s.pod.annotation.data` attribute with value `""`.

**[2] `k8s.pod.label.<key>`:** Examples:

- A label `app` with value `my-app` SHOULD be recorded as
  the `k8s.pod.label.app` attribute with value `"my-app"`.
- A label `mycompany.io/arch` with value `x64` SHOULD be recorded as
  the `k8s.pod.label.mycompany.io/arch` attribute with value `"x64"`.
- A label `data` with empty string value SHOULD be recorded as
  the `k8s.pod.label.data` attribute with value `""`.

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## Container

A container specification in a Pod template. This type is intended to be used to
capture information such as name of a container in a Pod template which is different
from the name of the running container.

Note: This type is different from [container](./container.md), which corresponds
to a running container.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.container`

**Description:** A container in a [PodTemplate](https://kubernetes.io/docs/concepts/workloads/pods/#pod-templates).

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.container.name`](/docs/attributes-registry/k8s.md) | string | The name of the Container from Pod specification, must be unique within a Pod. Container runtime usually uses different globally unique name (`container.name`). | `redis` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.container.restart_count`](/docs/attributes-registry/k8s.md) | int | Number of times the container was restarted. This attribute can be used to identify a particular container (running or stopped) within a container spec. |  | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.container.status.last_terminated_reason`](/docs/attributes-registry/k8s.md) | string | Last terminated reason of the Container. | `Evicted`; `Error` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

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## ReplicaSet

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.replicaset`

**Description:** A Kubernetes ReplicaSet object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.replicaset.name`](/docs/attributes-registry/k8s.md) | string | The name of the ReplicaSet. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.replicaset.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the ReplicaSet. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.replicaset.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the ReplicaSet. [1] | `k8s.replicaset.annotation.replicas=0`; `k8s.replicaset.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.replicaset.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the ReplicaSet. [2] | `k8s.replicaset.label.app=guestbook`; `k8s.replicaset.label.injected=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.replicaset.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.replicaset.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## Deployment

An API object that manages a replicated application, typically by running Pods
with no local state. Each replica is represented by a Pod, and the Pods are
distributed among the nodes of a cluster.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.deployment`

**Description:** A Kubernetes Deployment object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.deployment.name`](/docs/attributes-registry/k8s.md) | string | The name of the Deployment. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.deployment.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the Deployment. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.deployment.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the Deployment. [1] | `k8s.deployment.annotation.replicas=1`; `k8s.deployment.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.deployment.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the Deployment. [2] | `k8s.deployment.label.app=guestbook`; `k8s.deployment.label.injected=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.deployment.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.deployment.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## StatefulSet

Manages the deployment and scaling of a set of Pods, and provides guarantees
about the ordering and uniqueness of these Pods.

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**type:** `k8s.statefulset`

**Description:** A Kubernetes StatefulSet object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.statefulset.name`](/docs/attributes-registry/k8s.md) | string | The name of the StatefulSet. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.statefulset.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the StatefulSet. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.statefulset.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the StatefulSet. [1] | `k8s.statefulset.annotation.replicas=1`; `k8s.statefulset.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.statefulset.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the StatefulSet. [2] | `k8s.statefulset.label.app=guestbook`; `k8s.statefulset.label.injected=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.statefulset.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.statefulset.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## DaemonSet

A DaemonSet ensures that all (or some) Nodes run a copy of a Pod.

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**Status:** ![Development](https://img.shields.io/badge/-development-blue)

**type:** `k8s.daemonset`

**Description:** A Kubernetes DaemonSet object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.daemonset.name`](/docs/attributes-registry/k8s.md) | string | The name of the DaemonSet. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.daemonset.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the DaemonSet. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.daemonset.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the DaemonSet. [1] | `k8s.daemonset.annotation.replicas=1`; `k8s.daemonset.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.daemonset.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the DaemonSet. [2] | `k8s.daemonset.label.app=guestbook`; `k8s.daemonset.label.injected=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.daemonset.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.daemonset.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## Job

A Job creates one or more Pods and ensures that a specified number of them
successfully terminate.

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**type:** `k8s.job`

**Description:** A Kubernetes Job object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.job.name`](/docs/attributes-registry/k8s.md) | string | The name of the Job. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.job.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the Job. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.job.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The annotation key-value pairs placed on the Job. [1] | `k8s.job.annotation.number=1`; `k8s.job.annotation.data=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.job.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label key-value pairs placed on the Job. [2] | `k8s.job.label.jobtype=ci`; `k8s.job.label.automated=` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.job.annotation.<key>`:** The `<key>` being the annotation name, the value being the annotation value, even if the value is empty.

**[2] `k8s.job.label.<key>`:** The `<key>` being the label name, the value being the label value, even if the value is empty.

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## CronJob

A CronJob creates Jobs on a repeating schedule.

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**type:** `k8s.cronjob`

**Description:** A Kubernetes CronJob object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.cronjob.name`](/docs/attributes-registry/k8s.md) | string | The name of the CronJob. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.cronjob.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the CronJob. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.cronjob.annotation.<key>`](/docs/attributes-registry/k8s.md) | string | The cronjob annotation placed on the CronJob, the `<key>` being the annotation name, the value being the annotation value. [1] | `4`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.cronjob.label.<key>`](/docs/attributes-registry/k8s.md) | string | The label placed on the CronJob, the `<key>` being the label name, the value being the label value. [2] | `weekly`; `` | `Opt-In` | ![Development](https://img.shields.io/badge/-development-blue) |

**[1] `k8s.cronjob.annotation.<key>`:** Examples:

- An annotation `retries` with value `4` SHOULD be recorded as the
  `k8s.cronjob.annotation.retries` attribute with value `"4"`.
- An annotation `data` with empty string value SHOULD be recorded as
  the `k8s.cronjob.annotation.data` attribute with value `""`.

**[2] `k8s.cronjob.label.<key>`:** Examples:

- A label `type` with value `weekly` SHOULD be recorded as the
  `k8s.cronjob.label.type` attribute with value `"weekly"`.
- A label `automated` with empty string value SHOULD be recorded as
  the `k8s.cronjob.label.automated` attribute with value `""`.

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## ReplicationController

A ReplicationController ensures that a specified number of pod replicas are running at any one time.

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**type:** `k8s.replicationcontroller`

**Description:** A Kubernetes ReplicationController object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.replicationcontroller.name`](/docs/attributes-registry/k8s.md) | string | The name of the replication controller. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.replicationcontroller.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the replication controller. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

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## HorizontalPodAutoscaler

A HorizontalPodAutoscaler (HPA for short) automatically updates a workload resource
(such as a Deployment or StatefulSet), with the aim of automatically scaling the workload to match demand.

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**type:** `k8s.hpa`

**Description:** A Kubernetes HorizontalPodAutoscaler object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.hpa.name`](/docs/attributes-registry/k8s.md) | string | The name of the horizontal pod autoscaler. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.hpa.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the horizontal pod autoscaler. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

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## ResourceQuota

A ResourceQuota provides constraints that limit aggregate resource consumption per namespace.

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**type:** `k8s.resourcequota`

**Description:** A Kubernetes ResourceQuota object.

| Attribute  | Type | Description  | Examples  | [Requirement Level](https://opentelemetry.io/docs/specs/semconv/general/attribute-requirement-level/) | Stability |
|---|---|---|---|---|---|
| [`k8s.resourcequota.name`](/docs/attributes-registry/k8s.md) | string | The name of the resource quota. | `opentelemetry` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |
| [`k8s.resourcequota.uid`](/docs/attributes-registry/k8s.md) | string | The UID of the resource quota. | `275ecb36-5aa8-4c2a-9c47-d8bb681b9aff` | `Recommended` | ![Development](https://img.shields.io/badge/-development-blue) |

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[DocumentStatus]: https://opentelemetry.io/docs/specs/otel/document-status

## Kubernetes specific guidelines

The following guidelines are specific to Kubernetes:

- [Service in Kubernetes](../non-normative/k8s-attributes.md#service-attributes)
