When running a precheck on the SDDC, following an upgrade from VCF 4.5.2 to 5.2.0, generates a warning related to the upgrade policy configured for ESX hosts
On the SDDC UI - this precheck warning is presented -
VMware Cloud Foundation 5.2.0
This warning is flagging discrepancies in configuration between SDDC and vCenter for the ESX host upgrade policy
Refer to this document - it provides details on how the configuration can be remediated (by comparing what is expected with what is configured).
How to Configure the vSphere Lifecycle Manager Remediation Settings
For reference, this document captures the default ESX upgrade policy in SDDC Manager