Glossary

alarm

An action triggered whenever a meter reaches a certain threshold.

API server

HTTP REST API service for Aodh.

ceilometer

From Wikipedia [1]:

A ceilometer is a device that uses a laser or other light source to determine the height of a cloud base.

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.

zaqar

According to Zaqar Developer Documentation:

Zaqar is a multi-tenant cloud messaging and notification service for web and mobile developers.

project

The OpenStack tenant or project.

resource

The OpenStack entity being metered (e.g. instance, volume, image, etc).

user

An OpenStack user.

[1]	http://en.wikipedia.org/wiki/Ceilometer