title: Docker: Images
agents: linux
catalog: app/docker
license: MIT
distribution:
description:
 Reports one service per Docker image on a host running the {check_docker.py}
 agent plugin.

 Metrics: image size, number of running containers started from the image, and
 the aggregated memory and CPU usage of those running containers. The image age
 is reported and can be given upper levels with the rule set "Docker image".

 A dangling image (one without a repository tag) maps to a configurable state
 (default {WARN}) when it is monitored at all.

item:
 The image reference in {repository:tag} form.

discovery:
 One service is created per tagged image. The rule set "Docker image discovery"
 can limit this to images that have containers, and can optionally include
 dangling images.
