With introducing the alertmanager-access role (https://jira.coreos.com/browse/SREP-1983) we prevent users having the cluster-monitoring-view cluster role to view fired alerts/silences and any information that reads from alertmanager.
This change is too intrusive and too coarse-grained, so effectively PM (Christian Heidenreich) is voting for undoing that change for 4.3.
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.