PendingReleaseNotes: add note about `bluestore_zero_block_detection` config option

Signed-off-by: Laura Flores <lflores@redhat.com>
(cherry picked from commit fce2a7782d6bddada9258e5028e6459e72b4381e)

Conflicts:
	PendingReleaseNotes
	- The cherry-pick applied cleanly, but some extra release notes about >=18.0.0
          still was added that I had to remove.

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 547c99e537ce55fbe74172e10da57c4c8b5c477f..777b64315fcbcb1030faa84f16bb402d0ded16bc 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -1,3 +1,13 @@
+>=17.2.1
+
+* The "BlueStore zero block detection" feature (first introduced to Quincy in
+https://github.com/ceph/ceph/pull/43337) has been turned off by default with a
+new global configuration called `bluestore_zero_block_detection`. This feature,
+intended for large-scale synthetic testing, does not interact well with some RBD
+and CephFS features. Any side effects experienced in previous Quincy versions
+would no longer occur, provided that the configuration remains set to false.
+Relevant tracker: https://tracker.ceph.com/issues/55521
+
 >=17.0.0
 
 * Filestore has been deprecated in Quincy, considering that BlueStore has been