Update release instructions wrt grenade

This updates the release documentation to indicate that we have
to wait until grenade is testing the latest release against master,
before making code changes related to rolling upgrades.

Change-Id: I60a3343cfb4565da725a7b39c6ee8b04e4389dec

1 files changed, 8 insertions, 1 deletions

diff --git a/doc/source/contributor/releasing.rst b/doc/source/contributor/releasing.rst
index 7ee994554..33c7c3d33 100644
--- a/doc/source/contributor/releasing.rst
+++ b/doc/source/contributor/releasing.rst
@@ -108,7 +108,14 @@ We need to submit patches for changes on master to:
   and `pbr documentation
   <https://docs.openstack.org/pbr/latest/user/features.html#version>`_ for details.
 
-* to support rolling upgrades, since the release was a named release:
+* to support rolling upgrades, since the release was a named release, we
+  need to make these changes. Note that we need to wait until *after* the
+  switch in grenade is made to test the latest release (N) with master
+  (e.g. `for stable/queens <https://review.openstack.org/#/c/543615>`_).
+  Doing these changes sooner -- after the ironic release and before the switch
+  when grenade is testing the prior release (N-1) with master, will cause
+  the tests to fail. (You may want to ask/remind infra/qa team, as to
+  when they will do this switch.)
 
   * In ``ironic/common/release_mappings.py``, delete any entries from
     ``RELEASE_MAPPING`` associated with the oldest named release. Since we