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[Pierre Riteau <2008257@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Following an upgrade from Wallaby to Yoga of a Neutron OVN deployment, I
discovered that openstack-exporter would fail to return metrics for
Neutron agent states with the following error:

time="2023-02-23T10:49:33Z" level=error msg="Failed to collect metric
for exporter: neutron, error: failed to collect metric: agent_state,
error: parsing time \"2023-02-23 10:48:55.729000+00:00\": extra text:
\"+00:00\"" source="exporter.go:123"

I tracked it down to the following change which has also been backported
to stable/branches (so a recent Wallaby would also be affected):
https://review.opendev.org/c/openstack/neutron/+/844179

With this change, heartbeat timestamp includes timezone when previously
it didn't, causing clients such as the gophercloud library (which
openstack-exporter uses) to fail parsing of the response.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2008257

Title:
  OVN agent heartbeat timestamp format changed unexpectedly

Status in neutron:
  New

Bug description:
  Following an upgrade from Wallaby to Yoga of a Neutron OVN deployment,
  I discovered that openstack-exporter would fail to return metrics for
  Neutron agent states with the following error:

  time="2023-02-23T10:49:33Z" level=error msg="Failed to collect metric
  for exporter: neutron, error: failed to collect metric: agent_state,
  error: parsing time \"2023-02-23 10:48:55.729000+00:00\": extra text:
  \"+00:00\"" source="exporter.go:123"

  I tracked it down to the following change which has also been
  backported to stable/branches (so a recent Wallaby would also be
  affected): https://review.opendev.org/c/openstack/neutron/+/844179

  With this change, heartbeat timestamp includes timezone when
  previously it didn't, causing clients such as the gophercloud library
  (which openstack-exporter uses) to fail parsing of the response.

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