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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

Looking at these nova-compute logs:

http://logs.openstack.org/60/513160/4/check/tempest-dsvm-neutron-nova-
next-
full/6458405/logs/screen-n-cpu.txt.gz?level=TRACE#_Dec_08_23_13_42_867535

This type of warning message shows up 42 times:

Dec 08 23:13:42.867535 ubuntu-xenial-ovh-gra1-0001332290 nova-
compute[31536]: WARNING nova.compute.manager [None req-5378dd72-7f5d-
4c39-82ec-2989263136fb service nova] [instance: 7a32f2d9-a7e6-42fa-
b0a6-def8fdb56887] Detach interface failed, port_id=a5cd433c-589f-4c65
-814a-e71923e408cb, reason: Instance 7a32f2d9-a7e6-42fa-
b0a6-def8fdb56887 could not be found.: InstanceNotFound: Instance
7a32f2d9-a7e6-42fa-b0a6-def8fdb56887 could not be found.

If we failed to detach an interface because the instance was deleted,
it's not really a warning that the operator should care about, so we
should downgrade this from warning to debug.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: compute logging serviceability

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https://bugs.launchpad.net/bugs/1741075

Title:
  Excessive warning logs for "Detach interface failed" when the instance
  was deleted

Status in OpenStack Compute (nova):
  New

Bug description:
  Looking at these nova-compute logs:

  http://logs.openstack.org/60/513160/4/check/tempest-dsvm-neutron-nova-
  next-
  full/6458405/logs/screen-n-cpu.txt.gz?level=TRACE#_Dec_08_23_13_42_867535

  This type of warning message shows up 42 times:

  Dec 08 23:13:42.867535 ubuntu-xenial-ovh-gra1-0001332290 nova-
  compute[31536]: WARNING nova.compute.manager [None req-5378dd72-7f5d-
  4c39-82ec-2989263136fb service nova] [instance: 7a32f2d9-a7e6-42fa-
  b0a6-def8fdb56887] Detach interface failed, port_id=a5cd433c-589f-4c65
  -814a-e71923e408cb, reason: Instance 7a32f2d9-a7e6-42fa-
  b0a6-def8fdb56887 could not be found.: InstanceNotFound: Instance
  7a32f2d9-a7e6-42fa-b0a6-def8fdb56887 could not be found.

  If we failed to detach an interface because the instance was deleted,
  it's not really a warning that the operator should care about, so we
  should downgrade this from warning to debug.

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