Remove wrong statement about alertmanager URL configuration
@@ -982,10 +982,6 @@ external labels send identical alerts.
### `<alertmanager_config>`
-CAUTION: Dynamic discovery of Alertmanager instances is in alpha state. Breaking configuration
-changes may happen in future releases. Use static configuration via the `-alertmanager.url` flag
-as a stable alternative.
-
An `alertmanager_config` section specifies Alertmanager instances the Prometheus server sends
alerts to. It also provides parameters to configure how to communicate with these Alertmanagers.
