Add deprecation notice

Change-Id: I0d91909225cbd190e7640dbede66a816291b4554

README.md

diff --git a/README.md b/README.md
index 8338bcd..2f17d9b 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,11 @@
-# Analytics extraction plugin
+# DEPRECATION NOTICE
+
+GerritForge has decided to [change the license to BSL](https://gitenterprise.me/2025/09/30/re-licensing-gerritforge-plugins-welcome-to-gerrit-enterprise/)
+therefore the Apache 2.0 version of this plugin is deprecated.
+The recommended version of the analytics plugin is on [GitHub](https://github.com/GerritForge/analytics)
+and the development continues on [GerritHub.io](https://review.gerrithub.io/admin/repos/GerritForge/analytics,general).
+
+# Analytics extraction plugin (DEPRECATED)
 
 Extract commit and review data from Gerrit projects and expose aggregated metrics
 over REST and SSH API.