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This message applies to operators using cinder drivers that use the 
os-brick nvmeof connector.

os-brick release 4.2.0, released on 16 February, contains a refactored 
nvmeof connector that unfortunately introduced a regression in the 
connector interface and breaks older drivers that use the nvmeof 
connector.  So if you use such a driver, do not upgrade to 4.2.0.

This issue will be resolved before the "official" wallaby os-brick 
release.  You can follow events as they unfold on Bug #1916264:
   https://bugs.launchpad.net/os-brick/+bug/1916264