feat: add prometheus monitor

src/lib.rs

@@ -1,6 +1,7 @@
 use chromium::rocket::Chromium;
 use nanobyte_opentelemetry::rocket::TracingFairing;
 use rocket::{Rocket, Build, routes, fairing::AdHoc};
+use rocket_prometheus::PrometheusMetrics;
 use serde::Deserialize;
 pub mod routes;
 mod chromium;
@@ -24,6 +25,8 @@ pub struct DefaultPerson {
 }
 
 pub fn rocket_builder() -> Rocket<Build> {
+    let prometheus = PrometheusMetrics::new();
+
     rocket::build()
         .attach(TracingFairing::ignite())
         .attach(Chromium::ignite())
@@ -33,8 +36,10 @@ pub fn rocket_builder() -> Rocket<Build> {
         .attach(
             AdHoc::config::<DefaultPerson>()
         )
+        .attach(prometheus.clone())
         .mount("/", routes![
             routes::pdf::render_pdf_cv,
             routes::pdf::render_html_cv
         ])
+        .mount("/metrics", prometheus)
 }