anchor.diff:  === Image Change Trigger
   
   The ImageChange trigger results in a new deployment whenever the value of an
  -image stream tag changes.
  +image stream tag changes either by a build or because it was imported.
   
   The following is an example of an ImageChange trigger:
   
  
positive.code: == Triggers
  
  A deployment configuration can contain triggers, which drive the creation of
  new deployments in response to events, both inside and outside OpenShift.
  
  WARNING: If no triggers are defined on a deployment configuration, deployments
  must be link:#start-deployment[started manually].
  
negative.code: ====
  
  With the above example, when the `latest` tag value of the `origin-ruby-sample`
  image stream changes and the new image value differs from the current image
  specified in the deployment configuration's `helloworld` container, a new
  deployment is created using the new image for the `helloworld` container.
  
  NOTE: If an ImageChange trigger is defined on a deployment configuration (with
  a ConfigChange trigger or with automatic=true) and the ImageStreamTag pointed
  by the ImageChange trigger does not exist yet then the first deployment will
  automatically start as soon as an image is imported or pushed by a build to the
  ImageStreamTag.
  
  [[strategies]]
  == Strategies
  