Upstream ticket opened.
*** Bug 1776260 has been marked as a duplicate of this bug. ***
Manually upgraded from ceph-14.2.4-77.el8cp to ceph-14.2.4-85.el8cp. did not see the Dashboard crash and '500 Internal Server Error'. Moving this Bz to verified.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2020:0312