The LABEL instruction is a way to add metadata to your Docker image. This instruction adds embedded key-value pairs to the image. The LABEL instruction adds a zero-byte-sized layer to the image when it is created. An image can have more than one LABEL, and each LABEL instruction can provide one or more LABELs. The most common use for the LABEL instruction is to provide information about the image maintainer. This data used to have its own instruction. See the following tip box about the now-deprecated MAINTAINER instruction. Here are some examples of valid LABEL instructions:
# LABEL instruction syntax
# LABEL <key>=<value> <key>=<value> <key>=<value> ...
LABEL maintainer="Earl Waud <earlwaud@mycompany.com>"
LABEL "description"="My development Ubuntu image"
LABEL version="1.0"
LABEL...
