Add service version for Antelope

Also did a bit of cleanup in the text message to tell *when* we need to bump
the min service version.
Given 2023.1 is our first SLURP release, we need to clarify the level of
support we now have for rolling upgrades.

Next cycle, we should update the min version to be Zed.

Change-Id: I2dd906f34118da02783bb7755e0d6c2a2b88eb5d

1 files changed, 18 insertions, 3 deletions

diff --git a/nova/objects/service.py b/nova/objects/service.py
index 0ed443ef17..b17b5c2050 100644
--- a/nova/objects/service.py
+++ b/nova/objects/service.py
@@ -237,15 +237,30 @@ SERVICE_VERSION_HISTORY = (
 # local node identity for single-node systems.
 NODE_IDENTITY_VERSION = 65
 
-# This is used to raise an error at service startup if older than N-1 computes
-# are detected. Update this at the beginning of every release cycle to point to
-# the smallest service version that was added in N-1.
+# This is used to raise an error at service startup if older than supported
+# computes are detected.
+# NOTE(sbauza) : Please modify it this way :
+#  * At the beginning of a non-SLURP release (eg. 2023.2 Bobcat) (or just after
+#    the previous SLURP release RC1, like 2023.1 Antelope), please bump
+#    OLDEST_SUPPORTED_SERVICE_VERSION to the previous SLURP release (in that
+#    example, Antelope)
+#  * At the beginning of a SLURP release (eg. 2024.1 C) (or just after the
+#    previous non-SLURP release RC1, like 2023.2 Bobcat), please keep the
+#    OLDEST_SUPPORTED_SERVICE_VERSION value using the previous SLURP release
+#    (in that example, Antelope)
+#  * At the end of any release (SLURP or non-SLURP), please modify
+#    SERVICE_VERSION_ALIASES to add a key/value with key being the release name
+#    and value be the latest service version that the release supports (for
+#    example, before Bobcat RC1, please add 'Bobcat': XX where X is the latest
+#    servion version that was added)
 OLDEST_SUPPORTED_SERVICE_VERSION = 'Yoga'
 SERVICE_VERSION_ALIASES = {
     'Victoria': 52,
     'Wallaby': 54,
     'Xena': 57,
     'Yoga': 61,
+    'Zed': 64,
+    'Antelope': 66,
 }