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The Web Component Framework 59

Core Concepts

first history object should be no greater than the start time of the time range, and the end

time of the last history object should be no less than the end time of the time range.

When there are multiple metrics calculated for the same non-RAW time range (whether

they are different metrics on the same object, or the same metric on different objects),

they must have exactly the same number of history objects as each other, and the start

times and end times of the history objects at the same indices in their lists must be

identical.

If there are no agent observations that correspond to a history object within a certain

granularity interval in a non-RAW time range, a history object is still created, with the

appropriate start time and end time, but none of the value properties are filled in.

Metric Observations

An observation of a numerical value is called a metric.

Data collected by agents is generally expected to be collected into a Metric data object.

Certain components, such as the chart components, must be bound to Metric objects to

function.

Metric definitions must specify the unit property in the Metric’s containing Property

class. The unit is used to display numeric data. In particular, the unit’s precision

property is used by some components (such as charts) and renderers to ensure the

correct number of decimal places are used when rendering data. If the Metric’s precision

is desired to be different than its unit’s precision, you can set the precision directly on

the Metric’s containing Property class using the precision property.

Metrics must conform to the following schema:

Metric

Property Type Description

uniqueId String unique ID

name String name of metric, localizable

period MetricValue value for entire time range

current MetricValue value for last interval in time range

history MetricValue;

is-many = true

list of values for each interval in time range

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Dell Vizioncore Guía de usuario Pagina 59