75e10b2a48
The current way to calculate rate of change is not precise at all and depends on the local host clock. So, we have good chance that the host clock derive a bit between each polling. Also the timestamp is polling cycle run and not the exact polled sample. This makes the rate of change transformer not accurate, and maybe wrong if the local clock have jumped to much or if a pollster make to much time to get the stats (libvirt reconnection, ...). A sample gets a new attribute monotonic_time, where we can store an accurate polling time using monotonic.monotonic(). In rate of change transformer, if the monotonic time is available we use to calculate the time delta between samples. For instance metrics, we set monotonic_time as soon as we poll it from libvirt, avoiding almost all precision issue. That makes the rate of change precise to the nanoseconds for polled samples, while keeping the timestamp identical for all samples polled during one cycle. Related-bug: #1527620 Change-Id: I40e14fb6aa595a86df9767be5758f52b7ceafc8f |
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|---|---|---|
| api-ref/source | ||
| ceilometer | ||
| devstack | ||
| doc | ||
| etc | ||
| install-guide/source | ||
| rally-jobs | ||
| releasenotes | ||
| tools | ||
| .coveragerc | ||
| .gitignore | ||
| .gitreview | ||
| .mailmap | ||
| .testr.conf | ||
| babel.cfg | ||
| bindep.txt | ||
| CONTRIBUTING.rst | ||
| HACKING.rst | ||
| LICENSE | ||
| MAINTAINERS | ||
| README.rst | ||
| requirements.txt | ||
| run-tests.sh | ||
| setup.cfg | ||
| setup.py | ||
| test-requirements.txt | ||
| tox.ini | ||
Ceilometer
Ceilometer is a data collection service that collects event and metering data by monitoring notifications sent from OpenStack services. It publishes collected data to various targets including data stores and message queues.
Ceilometer is distributed under the terms of the Apache License, Version 2.0. The full terms and conditions of this license are detailed in the LICENSE file.
For more information about Ceilometer APIs, see https://developer.openstack.org/api-ref-telemetry-v2.html
Release notes are available at https://releases.openstack.org/teams/telemetry.html
Developer documentation is available at https://docs.openstack.org/ceilometer/latest/
For information on how to contribute to ceilometer, see the CONTRIBUTING.rst file.
The project home is at https://launchpad.net/ceilometer
To report any ceilometer related bugs, see https://bugs.launchpad.net/ceilometer/