Mention stats subdomain in docs

docs/configuring-dns.md

@@ -24,6 +24,7 @@ If you decide to go with the alternative method ([Server Delegation via a DNS SR
 | CNAME | `element`                    | -        | -      | -    | `matrix.<your-domain>` |
 | CNAME | `dimension` (*)              | -        | -      | -    | `matrix.<your-domain>` |
 | CNAME | `jitsi` (*)                  | -        | -      | -    | `matrix.<your-domain>` |
+| CNAME | `stats` (*)                  | -        | -      | -    | `matrix.<your-domain>` |
 | SRV   | `_matrix-identity._tcp`      | 10       | 0      | 443  | `matrix.<your-domain>` |
 
 
@@ -42,6 +43,8 @@ The `dimension.<your-domain>` subdomain may be necessary, because this playbook
 
 The `jitsi.<your-domain>` subdomain may be necessary, because this playbook could install the [Jitsi video-conferencing platform](https://jitsi.org/) for you. Jitsi installation is disabled by default, because it may be heavy and is not a core required component. To learn how to install it, see our [Jitsi](configuring-playbook-jitsi.md) guide. If you do not wish to set up Jitsi, feel free to skip the `jitsi.<your-domain>` DNS record.
 
+The `stats.<your-domain>` subdomain may be necessary, because this playbook could install [Grafana](https://grafana.com/) and setup performance metrics for you. Grafana installation is disabled by default, it is not a core required component. To learn how to install it, see our [metrics and graphs guide](configuring-playbook-prometheus-grafana.md). If you do not wish to set up Grafana, feel free to skip the `stats.<your-domain>` DNS record. It is possible to install Prometheus without installing Grafana, this would also not require the `stats.<your-domain>` subdomain.
+
 
 ## `_matrix-identity._tcp` SRV record setup
 

docs/configuring-playbook-prometheus-grafana.md

@@ -16,6 +16,8 @@ matrix_grafana_default_admin_user: yourname
 matrix_grafana_default_admin_password: securelongpassword
 ```
 
+The dashboards will by default be available on the `stats.<your-domain>` subdomain, proxied via Nginx.
+
 ## What does it do?
 
 Name | Description