logs + valid return

src/main.rs

@@ -21,8 +21,15 @@ struct AppState {
 }
 
 #[tokio::main]
-async fn main() {
+async fn main() -> anyhow::Result<()> {
     // let _ = setup_logger().await;
+
+    tracing_subscriber::fmt()
+        .with_max_level(tracing::Level::DEBUG)
+        .init();
+
+    info!("Initializing local Prometehus metrics registry ...");
+
     let registry = Registry::new();
     // let counter_opts = Opts::new("example_counter", "Пример счётчика");
     // let histogram_opts = Opts::new("example_histogram", "Пример histogram");
@@ -52,6 +59,8 @@ async fn main() {
     // registry.register(Box::new(sunops.clone())).unwrap();
     
 
+    info!("Initializing shared state for Prometheus Exporter web-server ...");
+
     let state = Arc::new(AppState {
         registry: Mutex::new(registry),
         // counter: Mutex::new(counter),
@@ -60,20 +69,15 @@ async fn main() {
 
     // info!("Configurating Web-Server...");
 
-    tracing_subscriber::fmt()
+    info!("Configurating internals of Prometheus Exporter web-server...");
-        .with_max_level(tracing::Level::DEBUG)
-        .init();
-
-    info!("Configurating Web-Server...");
 
     let app = Router::new()
         .route("/metrics", get(metrics_handler))
-        // .route("/increment", get(increment_handler))
-        // .route("/sum", get(summary_handler))
         .route("/update", post(update_metrics))
         .with_state(state.clone());
 
     let listener = TcpListener::bind("0.0.0.0:9100").await.unwrap();
     info!("Serving on ...:9100");
-    axum::serve(listener, app).await.unwrap();
+    axum::serve(listener, app).await?;
+    Ok(())
 }