This is an example set of prototypes for enabling HEALTHCHECK behavior in select official images.
This repository is not actively maintained and only exists as a reference in implementing your own HEALTHCHECK which meets your particular needs more accurately than these generic examples possibly could. Resulting images are not actively built and pushed to a Docker Registry (and the FROM lines are likely even outdated).
See the HEALTHCHECK FAQ entry for the rationale for why these don't get added to the official images directly.