PendingReleaseNotes: add a note about perf channel

Signed-off-by: Yaarit Hatuka <yaarit@redhat.com>

diff --git a/PendingReleaseNotes b/PendingReleaseNotes
index 5ab074ebab2a016d4c9927c26085b3463c62d6b8..2c9aa1d860c26d52c5de59ac79eed538de5756ce 100644 (file)
--- a/PendingReleaseNotes
+++ b/PendingReleaseNotes
@@ -129,6 +129,8 @@
   `ceph telemetry on`
   `ceph telemetry enable channel perf`
   See a sample report with `ceph telemetry preview`
+  Please note that generating a telemetry report with 'perf' channel data might
+  take a few moments in big clusters.
   For more details, see:
 
   https://docs.ceph.com/en/latest/mgr/telemetry/