add deprecation notice

Author: Reasonable-Solutions

docs/persistence/redis/README.md

@@ -3,8 +3,16 @@ tags: [persistence, explanation, redis, services]
 ---
 # Redis
 
-<<gcp_only("Redis")>>
+!!! warning Deprecated
+
+    Due to licensing changes Redis is deprecated and new instances cannot be created after the 15th february 2025.
+
+    The replacment, Valkey is available and offers bug-for-bug api compatibility.
 
+    See [Valkey](../valkey/README.md)
+
+
+<<gcp_only("Redis")>>
 
 Redis is a key value database that is used for storing and querying data. It is
 a good choice for storing data that is not relational in nature and often used