Docker max limit on number and size of labels

General
1

In my webapp, I’m trying to display the docker image metadata.

One such metadata is Dockerfile labels. Generally, metadata such as author, maintainers or organizations are represented using labels.

LABEL author="John Doe" \
      organization="Jane Doe" \
      maintainer="Jack Doe"

Questions:

  1. Is there a limit on the number of Label Key-value pairs?
  2. Is there a size/character limit for the Key or Value?

I tried going through the documentation but couldn’t find any exact details. Thanks in advance for your help.

NOTE: I’ve also posted this question on StackOverflow. Awaiting responses from the Docker & SO community.