[Bug 1833526] [NEW] An instance libvirtError will add resources to the blacklist

[dejianfu]

Public bug reported:

Libvirterror occurs when ceilometer polls cpu or memory metrics,
The poll_and_notify method captures the PollerPermanentError and adds resources to the blacklist.
Even if libvirt returns to normal, it will not clean up blacklist

** Affects: ceilometer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1833526

Title:
  An instance libvirtError will add resources to the blacklist

Status in ceilometer package in Ubuntu:
  New

Bug description:
  Libvirterror occurs when ceilometer polls cpu or memory metrics,
  The poll_and_notify method captures the PollerPermanentError and adds resources to the blacklist.
  Even if libvirt returns to normal, it will not clean up blacklist

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