Warning: This document is for the development version of Gnocchi. The main version is stable/4.0.

GlossaryΒΆ

Aggregate
A datapoint tuple generated from several measures according to the archive policy definition. It is composed of a timestamp and a value.
Aggregation method
Function used to aggregate multiple measures into an aggregate. For example, the min aggregation method will aggregate the values of different measures to the minimum value of all the measures in the time range.
Archive policy
An aggregate storage policy attached to a metric. It determines how long aggregates will be kept in a metric and how they will be aggregated.
Granularity
The time between two aggregates in an aggregated time series of a metric.
Measure
An incoming datapoint tuple sent to Gnocchi by the api. It is composed of a timestamp and a value.
Metric
An entity storing aggregates identified by an UUID. It can be attached to a resource using a name. How a metric stores its aggregates is defined by the archive policy it is associated to.
Resource
An entity representing anything in your infrastructure that you will associate metric(s) with. It is identified by a unique ID and can contain attributes.
Timeseries
A list of aggregates ordered by time.
Timespan
The time period for which a metric keeps its aggregates. It is used in the context of archive policy.