Struct Flag

pub struct Flag { /* private fields */ }

Flag histograms.

This histogram has only two states. Until the first call to record(), it is unset. Once record() has been called once, it is set and won’t change anymore. This type is useful if you need to track whether a feature was ever used during a session.

With SerializationFormat::SimpleJson, these histograms are serialized as a plain number 0 (unset)/1 (set).

Implementations

impl Flag

pub fn new(service: &Service, name: String) -> Flag

Create a new Flag histogram with a given name.

Argument name is used as key when processing and exporting the data. Each name must be unique to the Service.

Panics

If name is already used by another histogram in service.

Trait Implementations

impl Clone for Flag

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Histogram<()> for Flag

fn record_cb<F>(&self, cb: F)

where F: FnOnce() -> Option<()>,

Record a value in this histogram, as provided by a callback.

fn record(&self, value: T)

Record a value in this histogram.