Add ENV vars to running Rancher Server container

I have started a Rancher server (external MySQL) on AWS.

However after several operational days, I just found out that for the Rancher server node statistics to be exported to prometheus (and from there to grafana ) I need to set an additional environmental variable as also a port mapping.

What is the best/recommended way of stopping and restarting the server with these two additional parameters?

Same as any other upgrade, the version just isn’t necessarily changing. http://rancher.com/docs/rancher/v1.6/en/upgrading/

Thanks, that did the job.
(…and showcased the usefulness of external db…)