Fixes#1399
This versions the prometheus metrics API so we can manage backwards
incompatible changes in the future more easily.
Signed-off-by: Michael Crosby <crosbymichael@gmail.com>
Define the release process for containerd and outline the components
that are and are not covered by versioning guarantees. Please read the
document for details.
Signed-off-by: Stephen J Day <stephen.day@docker.com>