kube-state-metrics/docs

Documentation

This documentation is intended to be a complete reflection of the current state of the exposed metrics of kube-state-metrics.

Any contribution to improving this documentation or adding sample usages will be appreciated.

Table of Contents

• Metrics Stages
• Metrics Deprecation
• Exposed Metrics
• Join Metrics
• CLI arguments

Metrics Stages

Stages about metrics are grouped into three categories：

Stage	Description
EXPERIMENTAL	Metrics which normally correspond to the Kubernetes API object alpha status or spec fields and can be changed at any time.
STABLE	Metrics which should have very few backwards-incompatible changes outside of major version updates.
DEPRECATED	Metrics which will be removed once the deprecation timeline is met.

Metrics Deprecation

• The following non-generic resource metrics for pods are marked deprecated. They will be removed in kube-state-metrics v2.0.0. kube_pod_container_resource_requests and kube_pod_container_resource_limits are the replacements with resource labels representing the resource name and unit labels representing the resource unit.
  • kube_pod_container_resource_requests_cpu_cores
  • kube_pod_container_resource_limits_cpu_cores
  • kube_pod_container_resource_requests_memory_bytes
  • kube_pod_container_resource_limits_memory_bytes
• The following non-generic resource metrics for nodes are marked deprecated. They will be removed in kube-state-metrics v2.0.0. kube_node_status_capacity and kube_node_status_allocatable are the replacements with resource labels representing the resource name and unit labels representing the resource unit.
  • kube_node_status_capacity_pods
  • kube_node_status_capacity_cpu_cores
  • kube_node_status_capacity_memory_bytes
  • kube_node_status_allocatable_pods
  • kube_node_status_allocatable_cpu_cores
  • kube_node_status_allocatable_memory_bytes

Exposed Metrics

Per group of metrics there is one file for each metrics. See each file for specific documentation about the exposed metrics:

• CertificateSigningRequest Metrics
• ConfigMap Metrics
• CronJob Metrics
• DaemonSet Metrics
• Deployment Metrics
• Endpoint Metrics
• Horizontal Pod Autoscaler Metrics
• Ingress Metrics
• Job Metrics
• LimitRange Metrics
• MutatingWebhookConfiguration Metrics
• Namespace Metrics
• NetworkPolicy Metrics
• Node Metrics
• PersistentVolume Metrics
• PersistentVolumeClaim Metrics
• Pod Disruption Budget Metrics
• Pod Metrics
• ReplicaSet Metrics
• ReplicationController Metrics
• ResourceQuota Metrics
• Secret Metrics
• Service Metrics
• StatefulSet Metrics
• StorageClass Metrics
• ValidatingWebhookConfiguration Metrics
• VerticalPodAutoscaler Metrics
• VolumeAttachment Metrics

Join Metrics

When an additional, not provided by default label is needed, a Prometheus matching operator can be used to extend single metrics output.

This example adds label_release to the set of default labels of the kube_pod_status_ready metric and allows you select or group the metrics by helm release label:

kube_pod_status_ready * on (namespace, pod) group_left(label_release)  kube_pod_labels

Another useful example would be to query the memory usage of pods by its phase, such as Running:

sum(kube_pod_container_resource_requests_memory_bytes) by (namespace, pod, node)
  * on (pod) group_left()  (sum(kube_pod_status_phase{phase="Running"}) by (pod, namespace) == 1)

CLI Arguments

Additionally, options for kube-state-metrics can be passed when executing as a CLI, or in a kubernetes / openshift environment. More information can be found here: CLI Arguments