Nginx reverse proxy and OpenNMS Helm

I configured Grafana to run behind a Nginx reverse proxy and it’s running fine except the alarm table of the OpenNMS Helm app. If I want to open the “Options” tab of the alarm table, Grafana is throwing a “”{alert.title}} alert. If I’m disabling the reverse proxy, everything is fine, so I’m assuming that there is something wrong with my config. There is noting inside the Grafana or Nginx log…

location /grafana/ {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;

root_url = %(protocol)s://%(domain)s:/grafana/