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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

** Also affects: nova/rocky
   Importance: Undecided
       Status: New

** Changed in: nova/rocky
       Status: New => Confirmed

** Changed in: nova/rocky
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1763043

Title:
  Unnecessary "Instance not resizing, skipping migration" warning in
  n-cpu logs during live migration

Status in OpenStack Compute (nova):
  In Progress
Status in OpenStack Compute (nova) queens series:
  Confirmed
Status in OpenStack Compute (nova) rocky series:
  Confirmed

Bug description:
  In a 7 day CI run, we have over 40K hits of this warning in the logs:

  http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Instance%20not%20resizing%2C%20skipping%20migration%5C%22%20AND%20tags%3A%5C%22screen-n-cpu.txt%5C%22&from=7d

  http://logs.openstack.org/54/507854/4/gate/legacy-tempest-dsvm-
  multinode-live-
  migration/d723002/logs/subnode-2/screen-n-cpu.txt#_Apr_11_13_54_16_225676

  Apr 11 13:54:16.225676 ubuntu-xenial-rax-dfw-0003443206 nova-
  compute[29642]: WARNING nova.compute.resource_tracker [None req-
  61a6f9c9-3355-4594-acfa-ebf31ba995aa tempest-
  LiveMigrationTest-1725408283 tempest-LiveMigrationTest-1725408283]
  [instance: 6f4923e3-bf1f-4cb7-bd37-00e5d437759e] Instance not
  resizing, skipping migration.

  That warning was written back in 2012 when resize support was added to
  the resource tracker:

  https://review.openstack.org/#/c/15799/

  And since https://review.openstack.org/#/c/226411/ in 2015 it doesn't
  apply to evacuations.

  We shouldn't see a warning in the nova-compute logs during a normal
  operation like a live migration, so we really should either just drop
  this down to debug or remove it completely.

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