This bug was fixed in the package systemd - 229-4ubuntu21.5

---------------
systemd (229-4ubuntu21.5) xenial; urgency=medium

  [ Dimitri John Ledkov ]
  * systemctl: correctly proceed to immediate shutdown if scheduling fails
    (LP: #1670291)
  * hwdb: update micmute on Dell laptops. (LP: #1738153)
  * hwdb: Use wlan keycode for all Dell systems. (LP: #1762385)
  * units: Disable journald Watchdog (LP: #1773148)

  [ Mauricio Faria de Oliveira ]
  * core: Fix for service to enter the 'failed' state (rather than 'inactive') 
after it repeatedly fails restart.
    (LP: #1795658)

  [ Dimitri John Ledkov ]
  * Disable dh_installinit generation of tmpfiles for the systemd package.
    (LP: #1748147)

 -- Dimitri John Ledkov <x...@ubuntu.com>  Mon, 08 Oct 2018 16:10:42
+0100

** Changed in: systemd (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1795658

Title:
  xenial systemd reports 'inactive' instead of 'failed' for service
  units that repeatedly failed to restart / failed permanently

Status in systemd package in Ubuntu:
  Invalid
Status in systemd source package in Xenial:
  Fix Released

Bug description:
  [Impact]

   * In case a service unit has repeatedly failed to restart, it should be
     reported as 'failed' permanently, but currently it's instead reported
     as 'inactive'.

   * System monitoring tools that evaluate the status of systemd service units
     and act upon it (for example: restart service, report permanent failure)
     are currently misled by information in 'systemctl status <unit>.service'.

   * System management tools based on such information may take wrong and/or
     sub-optimal actions in the managed systems regarding such service units.

   * This systemd patch [1] directly addresses this issue (see systemd github
     PR #3166 [2]), and its code is still effectice in upstream systemd today,
     without further fixes/changes (the only changes were in doc text and the
     busname files that were removed, but still without further fixes to this).

  [Test Case]

   * This is copied from systemd PR #3166 [2].

   * This has been tested by a customer as well, and with its system monitoring
     and management solution, for interoperability verification.

      $ cat <<EOF | sudo tee /etc/systemd/system/fail-on-restart.service
      [Service]
      ExecStart=/bin/false
      Restart=always
      EOF

      $ sudo systemctl daemon-reload
      $ sudo systemctl start fail-on-restart

      Before) "Active: inactive (dead)"

      $ systemctl status -n0 fail-on-restart
      fail-on-restart.service
         Loaded: loaded (/etc/systemd/system/fail-on-restart.service; static; 
vendor preset: enabled)
         Active: inactive (dead)

      After) "Active: failed (Result: start-limit-hit)"
   
      $ systemctl status -n0 fail-on-restart
      fail-on-restart.service
         Loaded: loaded (/etc/systemd/system/fail-on-restart.service; static; 
vendor preset: enabled)
         Active: failed (Result: start-limit-hit) since Sat 2018-09-29 11:01:34 
UTC; 4s ago
        Process: 7066 ExecStart=/bin/false (code=exited, status=1/FAILURE)
       Main PID: 7066 (code=exited, status=1/FAILURE)

  [Regression Potential]

   * This code changes at which point the check for the number of (re)start
     attempts are made, so regressions to (re)start units are theoretically
     possible.

   * However, this code actually reverts a change that caused a regression,
     so it goes back to the code that was known to work correctly before ..

   * .. and it is still in this form in upstream systemd nowadays, 
     without further fixes/changes (see comment in the Impact section).

  [Other Info]

   * Test package was built on Launchpad PPA for all architectures,
     with dependencies from Proposed enabled (more up-to-date for SRU).

   * The testsuite (in package build time; blocks the package build result)
     has identical results to that in buildlog of current xenial-updates.

      
============================================================================
      Testsuite summary for systemd 229
      
============================================================================
      # TOTAL: 128
      # PASS:  109
      # SKIP:  19
      # XFAIL: 0
      # FAIL:  0
      # XPASS: 0
      # ERROR: 0
      
============================================================================

  [Links]
   
  [1] 
https://github.com/systemd/systemd/commit/072993504e3e4206ae1019f5461a0372f7d82ddf
  [2] https://github.com/systemd/systemd/issues/3166
  [3] https://launchpad.net/~mfo/+archive/ubuntu/sf199312

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