dipstick 0.7.1

A fast and modular metrics library decoupling app instrumentation from reporting backend. Similar to popular logging frameworks, but with counters and timers. Can be configured for combined outputs (log + statsd), random sampling, local aggregation of metrics, recurrent background publication, etc.
Documentation 
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use core::output::{Output, OutputScope, OutputMetric};
use core::name::MetricName;
use core::input::{InputKind, InputDyn, InputScope};
use core::Flush;

use std::sync::Arc;

lazy_static! {
    /// The reference instance identifying an uninitialized metric config.
    pub static ref VOID_INPUT: Arc<InputDyn + Send + Sync> = Arc::new(Void::metrics());

    /// The reference instance identifying an uninitialized metric scope.
    pub static ref NO_METRIC_SCOPE: Arc<InputScope + Send + Sync> = VOID_INPUT.input_dyn();
}

/// Discard metrics output.
#[derive(Clone)]
pub struct Void {}

/// Discard metrics output.
#[derive(Clone)]
pub struct VoidInput {}

/// Discard metrics output.
#[derive(Clone)]
pub struct VoidOutput {}

impl Void {
    /// Void metrics builder.
    pub fn metrics() -> Self {
        Void {}
    }
}

impl Output for Void {
    type SCOPE = VoidOutput;
    fn output(&self) -> VoidOutput {
        VoidOutput {}
    }
}

impl OutputScope for VoidOutput {
    fn new_metric(&self, _name: MetricName, _kind: InputKind) -> OutputMetric {
        OutputMetric::new(|_value, _labels| {})
    }
}

impl Flush for VoidOutput {
}