Technical references : Administration : Software health check
Software health check
The URL endpoint /health allows you to verify if your servers are up and running. A round-trip is executed from webserver to application server and database server, and back. The endpoint /health page returns OK if everything is up and running, and if that is not the case, NOK is returned.
Procedure
1. Make sure that there has been a valid login on the webserver. The /health URL only functions properly after one valid login on the webserver. Each time the webserver is restarted, one login is needed to have the URL work properly again.
* 
If there has been no valid login on the webserver, the /health URL returns OK but no round-trip is done and no check is performed!
2. Go to the endpoint /health.
The check is now performed.