Merge pull request #6745 from EnterpriseDB/efm/warn-create-standby

Add warning about known issue in efm 5.0.

Author: nidhibhammar

product_docs/docs/efm/5/07_using_efm_utility.mdx

@@ -97,6 +97,9 @@ The following example is generated by querying the status of a healthy cluster w
 
 ## efm create-standby
 
+!!!Note
+    Important information for version 5.0 only: If this command is run on a standby node (the local database is running and is being monitored), you must restart the agent after the command completes. There is a known issue that the agent can be left in an incorrect internal state. If this node is later promoted to primary and the database fails, there may not be a failover due to this state. This does not affect "Idle" nodes (where either the local database is not running or is not being monitored). It will be fixed in the 5.1 release.
+
 `efm create-standby <cluster_name> [-prompt] [-slot <slot_name>]`
 
 Invoke the `efm create-standby` command to create a new standby database on this node. The local agent must be running and there must be a primary agent in the cluster. The command process will: