LABEL

The LABEL instruction is very self-explanatory—it labels your images with key-value pairs as metadata that you will later be able to retrieve through the docker inspect command. You can use this to add data that you would like the user of your image to know. Usually, it is used to add the information about the author of the image, such as their email or company:

LABEL maintener="john.doe@company.com"

Because this instruction is just metadata, no extra layers will be added to your image.