[Bug 1849158] [NEW] Include the systemd package version in journal output

[Dan Watkins]

Public bug reported:

I'm currently debugging something based on journal output.  I,
helpfully, know what kernel was running due to this line:

  kernel: Linux version 5.3.0-13-generic (buildd at lgw01-amd64-012) (gcc
version 9.2.1 20190909 (Ubuntu 9.2.1-8ubuntu1)) #14-Ubuntu SMP Tue Sep
24 02:46:08 UTC 2019 (Ubuntu 5.3.0-13.14-generic 5.3.0)

but it's not entirely clear which version of systemd was running:

  systemd[1]: systemd 242 running in system mode. (<snip>)

Even during in eoan's development cycle, we've had a number of different
"systemd 242"s that this could be.  In a stable LTS, we'll have many
more (32 and counting "systemd 237"s in bionic, for example).  It would
be good if we captured this information in the journal somewhere.

** Affects: systemd (Ubuntu)
     Importance: Wishlist
         Status: New

** Changed in: systemd (Ubuntu)
   Importance: Undecided => Wishlist

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Title:
  Include the systemd package version in journal output

Status in systemd package in Ubuntu:
  New

Bug description:
  I'm currently debugging something based on journal output.  I,
  helpfully, know what kernel was running due to this line:

    kernel: Linux version 5.3.0-13-generic (buildd at lgw01-amd64-012) (gcc
  version 9.2.1 20190909 (Ubuntu 9.2.1-8ubuntu1)) #14-Ubuntu SMP Tue Sep
  24 02:46:08 UTC 2019 (Ubuntu 5.3.0-13.14-generic 5.3.0)

  but it's not entirely clear which version of systemd was running:

    systemd[1]: systemd 242 running in system mode. (<snip>)

  Even during in eoan's development cycle, we've had a number of
  different "systemd 242"s that this could be.  In a stable LTS, we'll
  have many more (32 and counting "systemd 237"s in bionic, for
  example).  It would be good if we captured this information in the
  journal somewhere.

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