A stack is a collection of services, usually related to one application or usage. For example, a WordPress stack definition may include a web server container (such as nginx) and a database container (such as MySQL).
The Images up to date column indicates whether the local images in the stack are up to date, with a green circle indicating they are up to date and a red circle indicating that there is a newer version of an image available at the remote registry. A grey circle indicates Portainer was unable to determine whether there is an update available for the images.
For more on how this works, have a look at this knowledge base article.
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