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[OpenStack Infra <1741075@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/530969
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=74fed3b2cdfb3a4aa82d7ac9618b7ddfbf85ecc5
Submitter: Zuul
Branch:    master

commit 74fed3b2cdfb3a4aa82d7ac9618b7ddfbf85ecc5
Author: Matt Riedemann <mriedem.os@xxxxxxxxx>
Date:   Wed Jan 3 11:58:14 2018 -0500

    Don't log a warning for InstanceNotFound in detach_interface
    
    If we're racing with an instance delete while detaching interfaces,
    don't log a warning in the case the instance is deleted at the
    same time, just log that at debug level.
    
    We see this warning about 42 times in a normal Tempest run so it's
    not uncommon.
    
    Change-Id: Ic2557ae5ba02924749c4c2b762a7f510483f1046
    Closes-Bug: #1741075


** Changed in: nova
       Status: In Progress => Fix Released

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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):
  Fix Released

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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