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[OpenStack Infra <1338745@xxxxxxxxxxxxxxxxxx>]

Fix proposed to branch: master
Review: https://review.openstack.org/105311

** Changed in: keystone
       Status: Opinion => In Progress

** Changed in: keystone
     Assignee: (unassigned) => John Dewey (retr0h)

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https://bugs.launchpad.net/bugs/1338745

Title:
  Add healthcheck middleware

Status in OpenStack Identity (Keystone):
  In Progress

Bug description:
  Would be useful for keystone to support a healthcheck URL for
  consumption by load balancers.

  This middleware should provide the ability to manually disable the
  service via the existence of a file on the system's local disk.  This
  middleware should also perform a basic application functionality [1]
  check prior to reporting OK.

  Having this middleware would give us some flexibility around LB health
  checks we do not have today, and IMO would be beneficial.  This is
  fairly similar to what swift [2] is doing as well.

  [1] https://github.com/CiscoSystems/puppet-monit/blob/a459a7314ac4f0250ad8b9c6956a872b949840f1/files/healthcheck.py#L37
  [2] https://github.com/openstack/swift/blob/0b594bc3afbffe942edebe9cdf02f60c06e627ab/swift/common/middleware/healthcheck.py

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