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[Andreas Hasenack <1999816@xxxxxxxxxxxxxxxxxx>]

I noticed that the focal patch is slightly different. It uses
`:undefined` instead of `:unknown` in information_unit.ex. That does not
match what is committed[1] upstream in the v3.8.x branch, and it remains
using `:unknown` in v3.8.x up to this day.

Could you please check if that's correct, and if yes, why are we
different from upstream in the focal patch?

I don't know erlang, but does the different word also translate to a
different output in the status command?


1. https://github.com/rabbitmq/rabbitmq-server/commit/7a5a467d4be4

** Changed in: rabbitmq-server (Ubuntu Focal)
       Status: In Progress => Incomplete

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https://bugs.launchpad.net/bugs/1999816

Title:
  Failure to get free disk space breaks "rabbitmqctl status" command

Status in rabbitmq-server package in Ubuntu:
  Fix Released
Status in rabbitmq-server source package in Focal:
  Incomplete
Status in rabbitmq-server source package in Jammy:
  In Progress
Status in rabbitmq-server source package in Kinetic:
  In Progress

Bug description:
  [Impact]

  When for some reason the df command fails to get the disk free space
  (for example timeout on a heavily loaded system) the result is a
  harcoded value of "unknown". As this is not a valid number this
  generates arithmetic errors when the "rabbitmqctl status" command is
  run and tries to divide that value to convert it to another unit.

  This has been fixed upstream here:
  https://github.com/rabbitmq/rabbitmq-server/pull/4897

  [Test Plan]

  The df command can be linked to another file that just waits for a few
  minutes to force a timeout for example: [detailed steps in comment
  #5].

  #!/bin/bash
  sleep 5m

  After the timeout occurs the "rabbitmqctl status" returns an error
  with the unpatched version. After the patch it shows all the
  information and displays unknown in the free space line.

  [Where problems could occur]

  The patch just changes the display of information, it should not break
  anything in the core operations of the package

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