doc: deprecate the cache tiering

This topic has been discussed many times; recently at the Dev Summit of Cephalocon 2023. This commit is the minial version of the work, contained entirely within the `doc`. However, likely it will be expanded as there were ideas like e.g. adding cache tiering back experimental feature list (Sam) to warn users when deploying a new cluster. Signed-off-by: Radosław Zarzyński <[email protected]>
nizamial09 · May 17, 2023 · 535b8db · 535b8db
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diff --git a/PendingReleaseNotes b/PendingReleaseNotes
@@ -138,6 +138,7 @@
   `ceph config set mgr mgr/telemetry/leaderboard_description ‘Cluster description’`.
 * CEPHFS: After recovering a Ceph File System post following the disaster recovery
   procedure, the recovered files under `lost+found` directory can now be deleted.
+* core: cache-tiering is now deprecated.
 
 >=17.2.1
 

diff --git a/doc/rados/operations/cache-tiering.rst b/doc/rados/operations/cache-tiering.rst
@@ -1,6 +1,10 @@
 ===============
  Cache Tiering
 ===============
+.. warning:: Cache tiering has been deprecated in the Reef release as it
+             has lacked a maintainer for a very long time. This does not mean
+             it will be certainly removed, but we may choose to remove it
+             without much further notice.
 
 A cache tier provides Ceph Clients with better I/O performance for a subset of
 the data stored in a backing storage tier. Cache tiering involves creating a