docs: clarify behavior of primaryUpdateStrategy for single-instance c…

…lusters (cloudnative-pg#5001) Clarified the behavior of primaryUpdateStrategy when applied to a cluster consisting of a single instance. Signed-off-by: Pierrick <[email protected]> (cherry picked from commit 893c61a)
EnterpriseDB · Dec 6, 2024 · 3dea456 · 3dea456
1 parent 5118173
commit 3dea456
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/docs/src/installation_upgrade.md b/docs/src/installation_upgrade.md
@@ -173,7 +173,10 @@ plugin for `kubectl`.
 !!! Important
     In case `primaryUpdateStrategy` is set to the default value of `unsupervised`,
     an upgrade of the operator will trigger a switchover on your PostgreSQL cluster,
-    causing a (normally negligible) downtime.
+    causing a (normally negligible) downtime. If your PostgreSQL Cluster has only one
+    instance, the instance will be automatically restarted as `supervised` value is
+    not supported for `primaryUpdateStrategy`. In either case, your applications will
+    have to reconnect to PostgreSQL.
 
 Since version 1.10.0, the rolling update behavior can be replaced with in-place
 updates of the instance manager. The latter don't require a restart of the