1 unstable release
0.1.0 | Oct 14, 2024 |
---|
#317 in Debugging
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axum-metrics
Minimalist exporter-agnostic metrics instrumentation middleware for axum.
See docs for more details.
lib.rs
:
Minimalist exporter-agnostic metrics
instrumentation middleware for axum
.
Note that we does not set metrics::Recorder
backend automatically.
You must pick and install a metrics
exporter like
metrics_exporter_prometheus
to perform actualy statistics and export the result.
use axum::routing::get;
use metrics_exporter_prometheus::PrometheusBuilder;
use tokio::net::TcpListener;
#[tokio::main]
async fn main() {
// Install a metrics exporter backend and expose metrics on 127.0.0.1:8050.
// This also spawns a upkeeping thread for maintenance of histogram data.
PrometheusBuilder::new()
.with_http_listener(([127, 0, 0, 1], 8050))
.install()
.unwrap();
let router = axum::Router::new()
.route("/", get(|| async { "hello world" }))
// Instrument for metrics.
.layer(axum_metrics::MetricLayer::default());
// Run the main server on 0.0.0.0:8000.
let listener = TcpListener::bind("0.0.0.0:8000").await.unwrap();
axum::serve(listener, router).await.unwrap();
}
Metrics
The metric and label names are heavily inspired by caddy.
Following metrics are recorded:
- gauge
http_requests_in_flight
: the number of in-flight requests. Streaming responses are counted until the full stream completes. - counter
http_requests_total
: the number of all requests ever processed. This is currently records after the response completes for simplicity. - histogram
http_request_size_bytes
: body size of requests in bytes. If the request is only half-read, then the number of actual read bytes is recorded. - histogram
http_response_size_bytes
: body size of requests in bytes. If the response is only half-written, then the number of actual written bytes is recorded. - histogram
http_request_duration_seconds
: time of round-trip of request in seconds. This is measured from request received to the end of response body stream. - histogram
http_response_duration_seconds
: time to first-byte of responss in seconds. This is measured from request received to the response future becomes ready.
Following labels are attached to relavent metrics:
endpoint
: the matched route template (MatchedPath
), orunknown
otherwise.method
: the request method.code
: the response status code.- Additional labels from
ExtraMetricLabels
extension ofRequest
orResponse
, if exists.
Dependencies
~3.5–5MB
~88K SLoC