Struct Immutable 

pub struct Immutable { /* private fields */ }

Snapshot of a mutable::Storage, that is not capable of registering metrics in a prometheus::Registry on the fly.

However, still allows to change metrics help description on the fly, once they are registered in a mutable::Storage before snapshot.

In comparison with a metrics::Registry, this immutable Storage provides much less overhead of accessing an already registered metric (just a simple HashMap lookup), however, is not capable of registering new metrics on the fly.

Implementations

impl Storage

pub fn describe<M>(&self, name: &str, description: String)

where M: Bundled, <M as Bundled>::Bundle: Bundle, Self: Get<Collection<<M as Bundled>::Bundle>>,

Changes the help description of the prometheus Metric identified by its name. No-op if this immutable Storage doesn’t contain it.

Accepts only the following prometheus Metrics:

• prometheus::IntCounter, prometheus::IntCounterVec
• prometheus::Gauge, prometheus::GaugeVec
• prometheus::Histogram, prometheus::HistogramVec

Intended to be used in metrics::Recorder::describe_counter(), metrics::Recorder::describe_gauge() and metrics::Recorder::describe_histogram() implementations.

pub fn get_metric<M>(&self, key: &Key) -> Option<Result<Metric<M>, Error>>

where M: Bundled, <M as Bundled>::Bundle: Bundle<Single = M>, Self: Get<Collection<<M as Bundled>::Bundle>>,

Returns a prometheus Metric stored in this immutable Storage and identified by the provided metrics::Key.

Accepts only the following prometheus metrics:

• prometheus::IntCounter
• prometheus::Gauge
• prometheus::Histogram

Intended to be used in metrics::Recorder::register_counter(), metrics::Recorder::register_gauge() and metrics::Recorder::register_histogram() implementations.

Errors

If the identified prometheus Metric doesn’t comply with the labeling of the provided metrics::Key.

Trait Implementations

impl Debug for Storage

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

Formats the value using the given formatter.

impl From<&Storage> for Storage

fn from(mutable: &Storage) -> Self

Creates a new immutable Storage by draining the referred mutable::Storage and leaving it empty.

impl Get<HashMap<String, Describable<Either<GenericCounter<AtomicU64>, MetricVec<CounterVecBuilder<AtomicU64>>>>>> for Storage

fn collection(&self) -> &Collection<PrometheusIntCounter>

Returns a Collection of metric::Bundles stored in this storage.

impl Get<HashMap<String, Describable<Either<GenericGauge<AtomicF64>, MetricVec<GaugeVecBuilder<AtomicF64>>>>>> for Storage

fn collection(&self) -> &Collection<PrometheusGauge>

Returns a Collection of metric::Bundles stored in this storage.

impl Get<HashMap<String, Describable<Either<Histogram, MetricVec<HistogramVecBuilder>>>>> for Storage

fn collection(&self) -> &Collection<PrometheusHistogram>

Returns a Collection of metric::Bundles stored in this storage.