| Counter | Counter is a cumulative metric that represents a single numerical value that only ever goes up.
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| CounterBuilder | Counter builder.
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| CounterCollector | Collect trait implmentation for Counter.
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| Gauge | Gauge is a metric that represents a single numerical value that can arbitrarily go up and down.
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| GaugeBuilder | Gauge builder.
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| GaugeCollector | Collect trait implmentation for Gauge.
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| Histogram | Histogram samples observations (usually things like request durations or response sizes) and
counts them in configurable buckets.
It also provides a sum of all observed values.
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| HistogramBuilder | Histogram builder.
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| HistogramCollector | Collect trait implmentation for Histogram.
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| MetricBuilder | Common builder for various metrics.
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| ProcessMetricsCollector | Process metrics collector.
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| Summary | Summary samples observations (usually things like request durations and response sizes).
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| SummaryBuilder | Summary builder.
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| SummaryCollector | Collect trait implmentation for Summary.
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