Std.App.Metrics.Metrics

type

This declaration introduces a public type.

What it does

Everything a program reports about itself.

Declarations are held in a map for lookup and an array for the order they

were declared in, because both questions are asked: rendering walks them in

order, and every measurement looks one up. A single array answers the first

and makes the second a scan of every metric the program has, on every

count — which is the one operation a busy program does most.

Series are keyed by their labels rather than held in a list, for the same

reason and more sharply: a metric broken down by route and method has as

many series as the product of those, and finding one by comparing label

lists reads every series to find one.

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• This declaration has no value signature because it introduces a type or trait.