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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==================================
+Adopt Oslo Guru Meditation Reports
+==================================
+
+https://blueprints.launchpad.net/ceilometer/+spec/guru-meditation-report
+
+This spec adopts Oslo Guru Meditation Reports in Ceilometer. The feature will
+enhance debugging capabilities of all Ceilometer services, by providing an easy
+and convenient way to collect debug data about current threads and
+configuration, among other things, to developers, operators, and tech support
+in production deployments.
+
+Problem description
+===================
+
+Currently, Ceilometer doesn't provide a way to collect state data from active
+service processes. The only information that is available to deployers,
+developers, and tech support is what was actually logged by the service.
+Additional data could be usefully used to debug and solve problems that occur
+during Ceilometer operation. We could be interested in stack traces of green
+and real threads, pid/ppid info, package version, configuration as seen by the
+service, etc.
+
+Oslo Guru Meditation Reports provide an easy way to add support for collecting
+the live state info from any service. Report generation is triggered by sending
+a special(USR1) signal to a service. Reports are generated on stderr, and can
+be piped into system log based on need.
+
+Nova has supported Oslo Guru Meditation Reports.
+
+Proposed change
+===============
+
+First, a new oslo-incubator module (reports.*) should be synchronized into
+Ceilometer tree. Then, each service process needs to initialize the error
+report system before the process executes launch method in the main function.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+This feature could expose service internals to someone who is able to send the
+needed signal to a service. That said, we can probably assume that the
+operator is already authorized to achieve a lot more than just having an access
+to stack traces and configuration used. Of course, if deployers are afraid of
+the information leak for some reason, they could also make sure their stderr
+output is channeled into safe place.
+
+Pipeline impact
+---------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance/Scalability Impacts
+-------------------------------
+
+The feature does not require any additional resources until it's triggered by
+the user and reports are not expected to be generated too often, so it has
+little impact on performance and scalability.
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  zhangtralon
+
+Work Items
+----------
+
+* sync reports.* module from oslo-incubator
+* adopt it in all ceilometer services under ceilometer/cmd/
+* add some developer docs on how to use this feature
+
+Future lifecycle
+================
+
+None
+
+Dependencies
+============
+Currently, the reports.* module from oslo-incubator is graduating into
+oslo.reports in Library. In case it's graduated into oslo.reports before
+Ceilometer switches to it, we will not need to synchronize the reports.* module.
+
+Testing
+=======
+
+None
+
+Documentation Impact
+====================
+
+Documentation should be extended to describe the new feature.
+
+References
+==========
+
+[1] oslo-incubator module: http://git.openstack.org/cgit/openstack/oslo-incubator/tree/openstack/common/report
+
+[2] nova guru meditation reports: https://blueprints.launchpad.net/nova/+spec/guru-meditation-report
+
+[3] blog about nova guru reports: https://www.berrange.com/posts/2015/02/19/nova-and-its-use-of-olso-incubator-guru-meditation-reports/
+
+[4] oslo.reports repo: https://github.com/directxman12/oslo.reports