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Struct polkadot_node_subsystem_util::metrics::prometheus::Histogram

pub struct Histogram { /* private fields */ }
Expand description

A Metric counts individual observations from an event or sample stream in configurable buckets. Similar to a Summary, it also provides a sum of observations and an observation count.

On the Prometheus server, quantiles can be calculated from a Histogram using the histogram_quantile function in the query language.

Note that Histograms, in contrast to Summaries, can be aggregated with the Prometheus query language (see the prometheus documentation for detailed procedures). However, Histograms require the user to pre-define suitable buckets, (see linear_buckets and exponential_buckets for some helper provided here) and they are in general less accurate. The Observe method of a Histogram has a very low performance overhead in comparison with the Observe method of a Summary.

Implementations§

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impl Histogram

pub fn with_opts(opts: HistogramOpts) -> Result<Histogram, Error>

with_opts creates a Histogram with the opts options.

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impl Histogram

pub fn observe(&self, v: f64)

Add a single observation to the Histogram.

pub fn start_timer(&self) -> HistogramTimer

Return a HistogramTimer to track a duration.

pub fn observe_closure_duration<F, T>(&self, f: F) -> T
where F: FnOnce() -> T,

Observe execution time of a closure, in second.

pub fn local(&self) -> LocalHistogram

Return a LocalHistogram for single thread usage.

pub fn get_sample_sum(&self) -> f64

Return accumulated sum of all samples.

pub fn get_sample_count(&self) -> u64

Return count of all samples.

Trait Implementations§

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impl Clone for Histogram

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fn clone(&self) -> Histogram

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Collector for Histogram

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fn desc(&self) -> Vec<&Desc>

Return descriptors for metrics.
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fn collect(&self) -> Vec<MetricFamily>

Collect metrics.
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impl Debug for Histogram

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fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter. Read more
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impl Metric for Histogram

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fn metric(&self) -> Metric

Return the protocol Metric.

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