[Bug 1244438] Re: EOL notification system required for HWE kernels in LTSs

[Adam Conrad]

So, if all these update notification things check a single semaphore
file, say "/var/lib/update-notifier/no-hwe-oel-warning", then the OEM
people can drop that flag in place on a forced update, to avoid their
users being notified of stack upgrades before they've validated the
upgrade path.

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Title:
  EOL notification system required for HWE kernels in LTSs

Status in Release Notes for Ubuntu:
  New
Status in “landscape” package in Ubuntu:
  Confirmed
Status in “linux” package in Ubuntu:
  Triaged
Status in “nagios-plugins” package in Ubuntu:
  Triaged
Status in “unattended-upgrades” package in Ubuntu:
  Confirmed
Status in “update-manager” package in Ubuntu:
  Confirmed
Status in “update-motd” package in Ubuntu:
  Confirmed

Bug description:
  We need to have some mechanism to allow us to record that you have an
  EOL kernel installed which will no longer receive updates.

  For example for the kernel when a kernel is going EOL the last upload
  should include an appropriate file:

      /var/lib/update-notifier/kernel-eol

  We need to coordinate this with the notifier itself to ensure it is
  displayed.

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