Monitoring Rust Applications with Prometheus

Professional

You can instrument your Rust application with the official Prometheus Rust client library and let the Glouton agent scrape its /metrics endpoint.

Install the client library

Add the dependencies to your Cargo.toml:

[dependencies]
prometheus-client = "0.22"
tokio = { version = "1", features = ["full"] }
axum = "0.7"

Minimal example

The snippet below defines a counter and exposes it on http://localhost:8080/metrics:

use axum::{routing::get, Router};
use prometheus_client::encoding::text::encode;
use prometheus_client::metrics::counter::Counter;
use prometheus_client::registry::Registry;
use std::sync::Arc;

#[tokio::main]
async fn main() {
    let mut registry = Registry::default();
    let requests_total = Counter::<u64>::default();
    registry.register(
        "myapp_requests",
        "Total number of processed requests",
        requests_total.clone(),
    );

    let registry = Arc::new(registry);
    let app = Router::new().route(
        "/metrics",
        get({
            let registry = registry.clone();
            move || async move {
                let mut buffer = String::new();
                encode(&mut buffer, &registry).unwrap();
                buffer
            }
        }),
    );

    let listener = tokio::net::TcpListener::bind("0.0.0.0:8080").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

Scrape with Glouton

Configure Glouton to scrape your application by adding the following to /etc/glouton/conf.d/50-prometheus-metrics.conf:

metric:
  prometheus:
    targets:
      - url: "http://localhost:8080/metrics"
        name: "my_rust_application"
        allow_metrics:
          - "myapp_requests_total"

Restart the agent to apply the configuration. See Prometheus Monitoring for the full list of options, including Docker label auto-discovery and Kubernetes annotations.

Monitoring Rust Applications with Prometheus

Install the client library

Minimal example

Scrape with Glouton

Learn more