Ceph Manager module 'prometheus' fails with AttributeError "'NoneType' object has no attribute 'fileno'" during OpenShift Data Foundation (ODF) 4.15 upgrade

Solution Verified - Updated -

Issue

  • During an OpenShift Data Foundation (ODF) cluster upgrade within the 4.15 release stream, the storage cluster enters a warning health state. The Ceph cluster status or manager daemon logs report a Python runtime exception within the integrated Prometheus exporter subsystem:
Module 'prometheus' has failed: AttributeError("'NoneType' object has no attribute 'fileno'")

Environment

  • OpenShift Data Foundation (ODF) 4.15.x
  • Red Hat Ceph Storage (RHCS) 6.x

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