add docs

docs/99-contact.md

 # Getting Help
 
+!!! warning
+     Starting from 25/06/2025, self-service creation of Grafana instances will be disabled. The creation of a new Grafana instance on the OKD App-Catalogue service will require a [ticket](https://cern.service-now.com/service-portal?id=sc_cat_item&name=request&se=PaaS-Web-Application-Templates). In any case, we suggest requesting a tenant in the [central Grafana MONIT instance](https://monit.docs.cern.ch/#how-to-get-your-monitoring-tenant).
+
 ## Report an issue
 
 To report an issue or ask for assistance, contact us at [Service Desk - PaaS-Web-App](https://cern.service-now.com/service-portal?id=service_element&name=PaaS-Web-App)

docs/README.md

 # Introduction
 
+!!! warning
+     Starting from 25/06/2025, self-service creation of Grafana instances will be disabled. The creation of a new Grafana instance on the OKD App-Catalogue service will require a [ticket](https://cern.service-now.com/service-portal?id=sc_cat_item&name=request&se=PaaS-Web-Application-Templates). In any case, we suggest requesting a tenant in the [central Grafana MONIT instance](https://monit.docs.cern.ch/#how-to-get-your-monitoring-tenant).
+
 This document describes how to create an instance of Grafana.
 
 Refer to the diferent topics for a more detailed explanation about how to install and to configure a Grafana instance.