`Stack-health validation` is failing post FFU from RHOSP 13 to 16.2

Solution Verified - Updated -

Issue

Stack-health validation is failing post FFU from RHOSP 13 to 16.2

[stack@undercloud-new ~]$ openstack tripleo validator run --group post-upgrade --inventory inventory.yaml
+--------------------------------------+---------------------------+--------+--------------------------+------------------------------------------------------------------------------------------------------------------------------+-------------------+-------------+
| UUID                                 | Validations               | Status | Host_Group               | Status_by_Host                                                                                                               | Unreachable_Hosts | Duration    |
+--------------------------------------+---------------------------+--------+--------------------------+-------------------------------------------------
| 21a6614c-ddde-4a22-91db-0d65f66b1835 | stack-health              | FAILED | undercloud               | undercloud                                                                                                                   |       

Environment

RHOSP 16.2

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