simple-secrets_prometheus-metrics-endpoint.rs

fn main() {
...
    let mut metrics_router = Router::new();
    metrics_router.get("/metrics", metrics, "get_metrics");
    let _metrics = Iron::new(metrics_router).http("127.0.0.1:3001");

    audit_event(
        ServerEvents::Start,
        &format!("New instance of secret-server started: {}", *SPIFFE_ID),
    );
}
...
fn metrics(_req: &mut Request) -> IronResult<Response> {
    let metric_families = prometheus::gather();
    let mut buffer = vec![];

    match prometheus_encoder.encode(&metric_families, &mut buffer) {
        Ok(_) => Ok(Response::with((iron::status::Ok, buffer))),
        Err(e) => {
            eprintln!("Unable to encode prometheus metrics: {}", e.to_string());
            Ok(Response::with(iron::status::InternalServerError))
        }
    }
}