Abstract Metric class. Metric names must be unique, are hierarchical, and use periods as separators. For example, 'a.b.c'. Uniqueness is only enforced when a Metric is registered. The name of a metric cannot contain the slash ('/') character.
description
of this metric. name
of this metric.
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https://api.dartlang.org/stable/2.0.0/dart-developer/Metric-class.html