> ## Documentation Index
> Fetch the complete documentation index at: https://docs.iroh.computer/llms.txt
> Use this file to discover all available pages before exploring further.

# Custom Metrics

iroh provides support for collecting metrics about your application's
performance and behavior using the `iroh-metrics` crate. This crate offers a
simple and flexible way to define, collect, and report various metrics.

## Example

```rust theme={null}
use iroh_metrics::{Counter, MetricsGroup};

/// Define your metrics:
#[derive(Debug, Default, MetricsGroup)]
#[metrics(name = "ping")]
pub struct Metrics {
    /// count of valid ping messages sent
    pub pings_sent: Counter,
    /// count of valid ping messages received
    pub pings_recv: Counter,
}

// elsewhere...
let metrics = Metrics::default();

// increment count of pings we've received
metrics.pings_recv.inc();
```

## Exporting metrics

* *Prometheus*: The `iroh-metrics` crate supports exporting metrics to Prometheus.
* *iroh services*: [Contact us](mailto:support@iroh.computer) if you are interested in custom metrics hosting without prometheus.