Struct Sensor 

pub struct Sensor { /* private fields */ }

A lock-free exponential moving average (EMA) gauge.

Useful for tracking smoothed rates or throughput where you want to dampen spikes. The smoothing factor alpha controls responsiveness:

• alpha close to 1.0 → responds quickly to new values (noisy)
• alpha close to 0.0 → responds slowly (smooth)

A typical value for per-second throughput is 0.05.

Example

use prometheus_extensions::Sensor;

let sensor = Sensor::new(0.05);
for _ in 0..100 {
    sensor.measure(1000.0);
}
// After many identical measurements, EMA converges to the input value.
assert!((sensor.get() - 1000.0).abs() < 10.0);

Implementations

impl Sensor

pub fn new(alpha: f64) -> Self

Create a new sensor with the given smoothing factor alpha.

Panics

Panics if alpha is not in the range (0.0, 1.0].

pub fn measure(&self, value: f64)

Feed a new measurement into the EMA.

pub fn get(&self) -> f64

Read the current smoothed value.