UMP 8.5.1 upgrade empties wasp\webapps\ROOT folder

Document ID : KB000071582
Last Modified Date : 26/02/2018
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Issue:
. Update from 8.4.7 to 8.5.1, everything goes smoothly, no errors in installation logs, but then when wasp (UMP) starts, there is just tomcat error message and the whole ROOT folder under wasp/webapps is empty.
Environment:
UIM 8.4.7 - Upgrade to  UIM 8.5.1
Cause:
not known. Happened only randomly.
Resolution:
Deploy all the UMP probes again into UMP robot will resolve this problem.