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use core::fmt;
use std::borrow::Cow;
use std::sync::Arc;
use crate::metrics::{
AsyncInstrumentBuilder, Gauge, InstrumentBuilder, InstrumentProvider, ObservableCounter,
ObservableGauge, ObservableUpDownCounter, UpDownCounter,
};
use crate::InstrumentationScope;
use super::{Counter, Histogram, HistogramBuilder};
/// Provides access to named [Meter] instances, for instrumenting an application
/// or crate.
pub trait MeterProvider {
/// Returns a new [Meter] with the provided name and default configuration.
///
/// A [Meter] should be scoped at most to a single application or crate. The
/// name needs to be unique so it does not collide with other names used by
/// an application, nor other applications.
///
/// If the name is empty, then an implementation defined default name will
/// be used instead.
///
/// # Examples
///
/// ```
/// use opentelemetry::{global, metrics::MeterProvider};
/// use opentelemetry::KeyValue;
///
/// let provider = global::meter_provider();
///
/// // meter used in applications
/// let meter = provider.meter("my_app");
/// ```
fn meter(&self, name: &'static str) -> Meter {
let scope = InstrumentationScope::builder(name).build();
self.meter_with_scope(scope)
}
/// Returns a new [Meter] with the given instrumentation scope.
///
/// # Examples
///
/// ```
/// use std::sync::Arc;
/// use opentelemetry::InstrumentationScope;
/// use opentelemetry::metrics::MeterProvider;
/// use opentelemetry_sdk::metrics::SdkMeterProvider;
///
/// let provider = SdkMeterProvider::default();
///
/// // meter used in applications/binaries
/// let meter = provider.meter("my_app");
///
/// // meter used in libraries/crates that optionally includes version and schema url
/// let scope = InstrumentationScope::builder(env!("CARGO_PKG_NAME"))
/// .with_version(env!("CARGO_PKG_VERSION"))
/// .with_schema_url("https://opentelemetry.io/schema/1.0.0")
/// .build();
///
/// let meter = provider.meter_with_scope(scope);
/// ```
fn meter_with_scope(&self, scope: InstrumentationScope) -> Meter;
}
/// Provides the ability to create instruments for recording measurements or
/// accepting callbacks to report measurements.
///
/// # Instrument Types
///
/// Instruments are categorized as either synchronous or asynchronous:
///
/// - **Synchronous Instruments** (e.g., Counter): These are used inline with
/// your application's processing logic. For example, you might use a Counter
/// to record the number of HTTP requests received.
///
/// - **Asynchronous Instruments** (e.g., ObservableGauge): These allow you to
/// register a callback function that is invoked during export. For instance,
/// you could use an asynchronous gauge to monitor temperature from a sensor
/// every time metrics are exported.
///
/// # Example Usage
///
/// ```rust
/// use opentelemetry::{global, KeyValue};
///
/// let meter = global::meter("my-meter");
///
/// // Synchronous Instruments
///
/// // u64 Counter
/// let u64_counter = meter.u64_counter("my_u64_counter").build();
/// u64_counter.add(
/// 10,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // f64 Counter
/// let f64_counter = meter.f64_counter("my_f64_counter").build();
/// f64_counter.add(
/// 3.15,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
///
/// // u64 Observable Counter
/// let _observable_u64_counter = meter
/// .u64_observable_counter("my_observable_u64_counter")
/// .with_description("My observable counter example")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 100,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // f64 Observable Counter
/// let _observable_f64_counter = meter
/// .f64_observable_counter("my_observable_f64_counter")
/// .with_description("My observable counter example")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 100.0,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // i64 UpDownCounter
/// let updown_i64_counter = meter.i64_up_down_counter("my_updown_i64_counter").build();
/// updown_i64_counter.add(
/// -10,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // f64 UpDownCounter
/// let updown_f64_counter = meter.f64_up_down_counter("my_updown_f64_counter").build();
/// updown_f64_counter.add(
/// -10.67,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // i64 Observable UpDownCounter
/// let _observable_updown_i64_counter = meter
/// .i64_observable_up_down_counter("my_observable_i64_updown_counter")
/// .with_description("My observable updown counter example")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 100,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // f64 Observable UpDownCounter
/// let _observable_updown_f64_counter = meter
/// .f64_observable_up_down_counter("my_observable_f64_updown_counter")
/// .with_description("My observable updown counter example")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 100.0,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // i64 Gauge
/// let gauge = meter.i64_gauge("my_gauge").build();
/// gauge.record(
/// -10,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // u64 Gauge
/// let gauge = meter.u64_gauge("my_gauge").build();
/// gauge.record(
/// 101,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // f64 Gauge
/// let gauge = meter.f64_gauge("my_gauge").build();
/// gauge.record(
/// 12.5,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // u64 Observable Gauge
/// let _observable_u64_gauge = meter
/// .u64_observable_gauge("my_u64_gauge")
/// .with_description("An observable gauge set to 1")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 1,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // f64 Observable Gauge
/// let _observable_f64_gauge = meter
/// .f64_observable_gauge("my_f64_gauge")
/// .with_description("An observable gauge set to 1.0")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 1.0,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // i64 Observable Gauge
/// let _observable_i64_gauge = meter
/// .i64_observable_gauge("my_i64_gauge")
/// .with_description("An observable gauge set to 1")
/// .with_unit("myunit")
/// .with_callback(|observer| {
/// observer.observe(
/// 1,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// )
/// })
/// .build();
///
/// // f64 Histogram
/// let f64_histogram = meter.f64_histogram("my_f64_histogram").build();
/// f64_histogram.record(
/// 10.5,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
///
/// // u64 Histogram
/// let u64_histogram = meter.u64_histogram("my_u64_histogram").build();
/// u64_histogram.record(
/// 12,
/// &[
/// KeyValue::new("mykey1", "myvalue1"),
/// KeyValue::new("mykey2", "myvalue2"),
/// ],
/// );
/// ```
///
#[derive(Clone)]
#[non_exhaustive]
pub struct Meter {
pub(crate) instrument_provider: Arc<dyn InstrumentProvider + Send + Sync>,
}
impl Meter {
/// Create a new named meter from an instrumentation provider
#[doc(hidden)]
pub fn new(instrument_provider: Arc<dyn InstrumentProvider + Send + Sync>) -> Self {
Meter {
instrument_provider,
}
}
/// creates an instrument builder for recording increasing values.
///
/// [`Counter`] can be cloned to create multiple handles to the same instrument. If a [`Counter`] needs to be shared,
/// users are recommended to clone the [`Counter`] instead of creating duplicate [`Counter`]s for the same metric. Creating
/// duplicate [`Counter`]s for the same metric could lower SDK performance.
pub fn u64_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Counter<u64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values.
///
/// [`Counter`] can be cloned to create multiple handles to the same instrument. If a [`Counter`] needs to be shared,
/// users are recommended to clone the [`Counter`] instead of creating duplicate [`Counter`]s for the same metric. Creating
/// duplicate [`Counter`]s for the same metric could lower SDK performance.
pub fn f64_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Counter<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values via callback.
pub fn u64_observable_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableCounter<u64>, u64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording increasing values via callback.
pub fn f64_observable_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableCounter<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value.
///
/// [`UpDownCounter`] can be cloned to create multiple handles to the same instrument. If a [`UpDownCounter`] needs to be shared,
/// users are recommended to clone the [`UpDownCounter`] instead of creating duplicate [`UpDownCounter`]s for the same metric. Creating
/// duplicate [`UpDownCounter`]s for the same metric could lower SDK performance.
pub fn i64_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, UpDownCounter<i64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value.
///
/// [`UpDownCounter`] can be cloned to create multiple handles to the same instrument. If a [`UpDownCounter`] needs to be shared,
/// users are recommended to clone the [`UpDownCounter`] instead of creating duplicate [`UpDownCounter`]s for the same metric. Creating
/// duplicate [`UpDownCounter`]s for the same metric could lower SDK performance.
pub fn f64_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, UpDownCounter<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value via callback.
///
/// [`UpDownCounter`] can be cloned to create multiple handles to the same instrument. If a [`UpDownCounter`] needs to be shared,
/// users are recommended to clone the [`UpDownCounter`] instead of creating duplicate [`UpDownCounter`]s for the same metric. Creating
/// duplicate [`UpDownCounter`]s for the same metric could lower SDK performance.
pub fn i64_observable_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableUpDownCounter<i64>, i64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording changes of a value via callback.
pub fn f64_observable_up_down_counter(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableUpDownCounter<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
///
/// [`Gauge`] can be cloned to create multiple handles to the same instrument. If a [`Gauge`] needs to be shared,
/// users are recommended to clone the [`Gauge`] instead of creating duplicate [`Gauge`]s for the same metric. Creating
/// duplicate [`Gauge`]s for the same metric could lower SDK performance.
pub fn u64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<u64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
///
/// [`Gauge`] can be cloned to create multiple handles to the same instrument. If a [`Gauge`] needs to be shared,
/// users are recommended to clone the [`Gauge`] instead of creating duplicate [`Gauge`]s for the same metric. Creating
/// duplicate [`Gauge`]s for the same metric could lower SDK performance.
pub fn f64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<f64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording independent values.
/// [`Gauge`] can be cloned to create multiple handles to the same instrument. If a [`Gauge`] needs to be shared,
/// users are recommended to clone the [`Gauge`] instead of creating duplicate [`Gauge`]s for the same metric. Creating
/// duplicate [`Gauge`]s for the same metric could lower SDK performance.
pub fn i64_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> InstrumentBuilder<'_, Gauge<i64>> {
InstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn u64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<u64>, u64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn i64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<i64>, i64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording the current value via callback.
pub fn f64_observable_gauge(
&self,
name: impl Into<Cow<'static, str>>,
) -> AsyncInstrumentBuilder<'_, ObservableGauge<f64>, f64> {
AsyncInstrumentBuilder::new(self, name.into())
}
/// creates an instrument builder for recording a distribution of values.
///
/// [`Histogram`] can be cloned to create multiple handles to the same instrument. If a [`Histogram`] needs to be shared,
/// users are recommended to clone the [`Histogram`] instead of creating duplicate [`Histogram`]s for the same metric. Creating
/// duplicate [`Histogram`]s for the same metric could lower SDK performance.
pub fn f64_histogram(
&self,
name: impl Into<Cow<'static, str>>,
) -> HistogramBuilder<'_, Histogram<f64>> {
HistogramBuilder::new(self, name.into())
}
/// creates an instrument builder for recording a distribution of values.
///
/// [`Histogram`] can be cloned to create multiple handles to the same instrument. If a [`Histogram`] needs to be shared,
/// users are recommended to clone the [`Histogram`] instead of creating duplicate [`Histogram`]s for the same metric. Creating
/// duplicate [`Histogram`]s for the same metric could lower SDK performance.
pub fn u64_histogram(
&self,
name: impl Into<Cow<'static, str>>,
) -> HistogramBuilder<'_, Histogram<u64>> {
HistogramBuilder::new(self, name.into())
}
}
impl fmt::Debug for Meter {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str("Meter")
}
}