warp-prometheus

Afterthought of Prometheus metrics for Warp

Example

```rust use prometheus::Registry; use warp_prometheus::Metrics; use warp::Filter;

let registry: Registry = Registry::new(); let path_includes: Vec = vec![String::from("users"), String::from("registration")];

let route_one = warp::path("hello") .and(warp::path::param()) .and(warp::header("user-agent")) .map(|param: String, agent: String| { format!("Hello {}, whose agent is {}", param, agent) });

let metrics = Metrics::new(&registry, &path_includes);

let test_routes = route_one.with(warp::log::custom(move |log| {
    metrics.http_metrics(log)
}));

```