This page allows
you to predict future values of a metric for the members of group based on
historical metrics.
The Metric Data Extrapolation plugin is
available on the Views tab when a group is selected. Although this function is
available for any group, whether compatible or mixed, metric projections are
most meaningful for compatible groups.
The extrapolation method is a simple
linear regression using the Apache Commons Math package. The historical metric
data for a group is used to calculate a slope, which is used to predict future
values.
To extrapolate a metric for a members
of a group:
1 
Navigate to compatible group of
interest.

2 
Choose the Metric Data Extrapolation
option from the Views tab.

3 
You can select:
■

Metric to extrapolate. By default,
Availability is selected. If desired, choose another metric.

■

Known Data Range. The amountof history
upon which the extrapolation will be based. You can select values ranging from
1 day to 1 year. Typically, a longer data range yields a better extrapolation.
In some cases, however, it might be better to select the data range based on
the timing of environmentrelated events, such as a new release or
infrastructure change.

■

Projection Range. The total duration
included in the trend analysis, including the Known Data Range and the
Projection Range. The range you select determines, but is not equal to, how far
into the future the metric will be projected.

■

Threshold value for the metric. Charts
will display a horizontal line at the metric value you enter.


4 
Click Update to plot the extrapolated
values for the selected metric for each member of the Group. Historical values
are plotted in blue.
