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[Bug 1468012] Re: compute monitors should be loaded via stevedore

 

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => liberty-2

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https://bugs.launchpad.net/bugs/1468012

Title:
  compute monitors should be loaded via stevedore

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  The monitor plugins in /nova/compute/monitors/ are currently loaded
  via a nova.loadables.BaseLoader subclass called
  ResourceMonitorHandler. We should be able to get rid of the
  nova.loadables Python module and just use the stevedore library, which
  is purpose-built for extension loading and managing like this.

  This would have the side benefit of us being able to deprecate the
  following CONF options:

  compute_monitors_opts = [
      cfg.MultiStrOpt('compute_available_monitors',
                      default=['nova.compute.monitors.all_monitors'],
                      help='Monitor classes available to the compute which may '
                           'be specified more than once.'),
      cfg.ListOpt('compute_monitors',
                  default=[],
                  help='A list of monitors that can be used for getting '
                       'compute metrics.'),
      ]

  Since stevedore's ExtensionManager loads extensions via standard
  Python setuptools entry_points.

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References