Table of Contents
Distinction between metrics and events
For the purposes of Platform Service Assurance, it's important to distinguish between metrics and events as well as how they are measured (from a timing perspective).
A Metric is a (standard) definition of a quantity describing the performance and/or reliability of a monitored function, which has an intended utility and is carefully specified to convey the exact meaning of the measured value. A measured value of a metric is produced in an assessment of a monitored function according to a method of measurement. For example the number of dropped packets for a networking interface is a metric.
An Event is defined as an important state change in a monitored function. The monitor system is notified that an event has occurred using a message with a standard format. The Event notification describes the significant aspects of the event, such as the name and ID of the monitored function, the type of event, and the time the event occurred. For example, an event notification would take place if the link status of a networking device on a compute node suddenly changes from up to down on a node hosting VNFs in an NFV deployment.
Statistics
Statistics in collectd consist of a value list. A value list includes:
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