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Kubernetes

Status: Experimental

Useful resources to understand Kubernetes objects and metadata:

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

type: k8s.cluster

Description: A Kubernetes Cluster.

Attribute Type Description Examples Requirement Level
k8s.cluster.name string The name of the cluster. opentelemetry-cluster Recommended
k8s.cluster.uid string A pseudo-ID for the cluster, set to the UID of the kube-system namespace. [1] 218fc5a9-a5f1-4b54-aa05-46717d0ab26d Recommended

[1]: K8s does not 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. 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.

Node

type: k8s.node

Description: A Kubernetes Node.

Attribute Type Description Examples Requirement Level
k8s.node.name string The name of the Node. node-1 Recommended
k8s.node.uid string The UID of the Node. 1eb3a0c6-0477-4080-a9cb-0cb7db65c6a2 Recommended

Namespace

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

type: k8s.namespace

Description: A Kubernetes Namespace.

Attribute Type Description Examples Requirement Level
k8s.namespace.name string The name of the namespace that the pod is running in. default Recommended

Pod

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

type: k8s.pod

Description: A Kubernetes Pod object.

Attribute Type Description Examples Requirement Level
k8s.pod.uid string The UID of the Pod. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.pod.name string The name of the Pod. opentelemetry-pod-autoconf Recommended

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, which corresponds to a running container.

type: k8s.container

Description: A container in a PodTemplate.

Attribute Type Description Examples Requirement Level
k8s.container.name 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
k8s.container.restart_count 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. 0; 2 Recommended

ReplicaSet

A ReplicaSet’s purpose is to maintain a stable set of replica Pods running at any given time.

type: k8s.replicaset

Description: A Kubernetes ReplicaSet object.

Attribute Type Description Examples Requirement Level
k8s.replicaset.uid string The UID of the ReplicaSet. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.replicaset.name string The name of the ReplicaSet. opentelemetry Recommended

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.

type: k8s.deployment

Description: A Kubernetes Deployment object.

Attribute Type Description Examples Requirement Level
k8s.deployment.uid string The UID of the Deployment. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.deployment.name string The name of the Deployment. opentelemetry Recommended

StatefulSet

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

type: k8s.statefulset

Description: A Kubernetes StatefulSet object.

Attribute Type Description Examples Requirement Level
k8s.statefulset.uid string The UID of the StatefulSet. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.statefulset.name string The name of the StatefulSet. opentelemetry Recommended

DaemonSet

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

type: k8s.daemonset

Description: A Kubernetes DaemonSet object.

Attribute Type Description Examples Requirement Level
k8s.daemonset.uid string The UID of the DaemonSet. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.daemonset.name string The name of the DaemonSet. opentelemetry Recommended

Job

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

type: k8s.job

Description: A Kubernetes Job object.

Attribute Type Description Examples Requirement Level
k8s.job.uid string The UID of the Job. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.job.name string The name of the Job. opentelemetry Recommended

CronJob

A CronJob creates Jobs on a repeating schedule.

type: k8s.cronjob

Description: A Kubernetes CronJob object.

Attribute Type Description Examples Requirement Level
k8s.cronjob.uid string The UID of the CronJob. 275ecb36-5aa8-4c2a-9c47-d8bb681b9aff Recommended
k8s.cronjob.name string The name of the CronJob. opentelemetry Recommended