'modified: docs/reference/r-contacts.md' (#373)

Co-authored-by: upload-charms-docs-bot <[email protected]>

Author: github-actions[bot]

docs/reference/r-contacts.md

@@ -1,6 +1,6 @@
 # Contacts
 
-Contact Canonical Data Platform team in [Mattermost](https://chat.charmhub.io/charmhub/channels/data-platform) (preferred).
+Contact Canonical Data Platform team in [Matrix](https://matrix.to/#/#charmhub-data-platform:ubuntu.com) (preferred),<br/>(the legacy [Mattermost](https://chat.charmhub.io/charmhub/channels/data-platform) channel is in read-only until January 31, 2025).
 
 Report your ideas/issues on [GitHub](https://github.com/canonical/mysql-k8s-operator/issues/new/choose).</br>
 Security issues should be reported through [LaunchPad](https://wiki.ubuntu.com/DebuggingSecurity#How%20to%20File).</br>Please do NOT file GitHub issues on security topics. 
@@ -9,5 +9,6 @@ Useful links:
 * [Canonical Data Fabric](https://ubuntu.com/data/)
 * [Charmed MySQL K8s](https://charmhub.io/mysql-k8s)
 * [Git sources for Charmed MySQL K8s](https://github.com/canonical/mysql-k8s-operator)
-* [Canonical Data Platform on Launchpad](https://launchpad.net/~data-platform)
+* [Canonical Data on Launchpad](https://launchpad.net/~data-platform)
+* [Canonical Data on Matrix](https://matrix.to/#/#charmhub-data-platform:ubuntu.com) 
 * [Mailing list on Launchpad](https://lists.launchpad.net/data-platform/)