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..
Copyright 2012 New Dream Network (DreamHost)
Copyright 2013 eNovance
Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
==========
Glossary
==========
.. glossary::
agent
Software service running on the OpenStack infrastructure
measuring usage and sending the results to the :term:`collector`.
alarm
An action triggered whenever a meter reaches a certain threshold.
API server
HTTP REST API service for ceilometer.
billing
Billing is the process to assemble bill line items into a single
per customer bill, emitting the bill to start the payment collection.
bus listener agent
Bus listener agent which takes events generated on the Oslo
notification bus and transforms them into Ceilometer samples. This
is the preferred method of data collection.
ceilometer
From Wikipedia [#]_:
A ceilometer is a device that uses a laser or other light
source to determine the height of a cloud base.
central agent
Software service running on a central management node within the
OpenStack infrastructure measuring usage and sending the results
to the :term:`collector`.
collector
Software service running on the OpenStack infrastructure
monitoring notifications from other OpenStack components and
samples from the ceilometer agent and recording the results
in the database.
compute agent
Software service running on a compute node within the OpenStack
infrastructure measuring usage and sending the results to the
:term:`collector`.
data store
Storage system for recording data collected by ceilometer.
http callback
HTTP callback is used for calling a predefined URL, whenever an
alarm has been set off. The payload of the request contains
all the details of why the alarm was triggered.
log
Logging is one of the alarm actions that is useful mostly for debugging,
it stores the alarms in a log file.
meter
The measurements tracked for a resource. For example, an instance has
a number of meters, such as duration of instance, CPU time used,
number of disk io requests, etc.
Three types of meters are defined in ceilometer:
* Cumulative: Increasing over time (e.g. disk I/O)
* Gauge: Discrete items (e.g. floating IPs, image uploads) and fluctuating
values (e.g. number of Swift objects)
* Delta: Incremental change to a counter over time (e.g. bandwidth delta)
metering
Metering is the process of collecting information about what,
who, when and how much regarding anything that can be billed. The result of
this is a collection of "tickets" (a.k.a. samples) which are ready to be
processed in any way you want.
notification
A message sent via an external OpenStack system (e.g Nova, Glance,
etc) using the Oslo notification mechanism [#]_. These notifications
are usually sent to and received by Ceilometer through the notifier
RPC driver.
non-repudiable
From Wikipedia [#]_:
Non-repudiation refers to a state of affairs where the purported
maker of a statement will not be able to successfully challenge
the validity of the statement or contract. The term is often
seen in a legal setting wherein the authenticity of a signature
is being challenged. In such an instance, the authenticity is
being "repudiated".
project
The OpenStack tenant or project.
polling agents
The polling agent is collecting measurements by polling some API or other
tool at a regular interval.
push agents
The push agent is the only solution to fetch data within projects,
which do not expose the required data in a remotely usable way. This
is not the preferred method as it makes deployment a bit more
complex having to add a component to each of the nodes that need
to be monitored.
rating
Rating is the process of analysing a series of tickets,
according to business rules defined by marketing, in order to transform
them into bill line items with a currency value.
resource
The OpenStack entity being metered (e.g. instance, volume, image, etc).
sample
Data sample for a particular meter.
source
The origin of metering data. This field is set to "openstack" by default.
It can be configured to a different value using the sample_source field
in the ceilometer.conf file.
user
An OpenStack user.
.. [#] http://en.wikipedia.org/wiki/Ceilometer
.. [#] https://git.openstack.org/cgit/openstack/ceilometer/tree/ceilometer/openstack/common/notifier
.. [#] http://en.wikipedia.org/wiki/Non-repudiation
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