[Bug 1853912] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for casper has completed
successfully and the package is now being released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
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the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
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https://bugs.launchpad.net/bugs/1853912

Title:
  /etc/pollinate/add-user-agent should be populated (in the server live
  env) to allow better identification of live clients

Status in casper package in Ubuntu:
  Fix Released
Status in casper source package in Bionic:
  Fix Released
Status in casper source package in Focal:
  Fix Released

Bug description:
  [Impact]

  Pollinate provides various bits of information in the user agent to
  allow gathering of statistics about Ubuntu clients.  Unfortunately,
  the 'subiquity' tag is only added (via curtin->cloud-init) to the user
  agent tag in the *target* system; the live environment, which also
  runs pollinate for entropy gathering, does not have any such tag.
  This makes it impossible to distinguish booted live server images from
  other "generic" clients in the data.

  It would be valuable to have a tag identifying the live server image
  for statistical and debugging purposes.

  I would suggest using 'live/<serial>' as a tag, where <serial> is the
  image build serial from /mnt/.disk/info.

  This probably needs to be done by casper reading the file and
  synthesizing the content on the live overlay.

  [Test Case]

   * Boot subiquity live session
   * Run $ pollinate --print-user-agent
   * Check that it contains ISO .disk/info information

  [Regression Potential]

   * User-agent configuration support is in place in bionic and used by
  other images (i.e. cloud). This completes configuring pollinate in
  subiquity images, in a similar way as is done on other images.

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