Refactor initializing tracing-subscriber

examples/jwt/src/main.rs

@@ -20,7 +20,6 @@ use once_cell::sync::Lazy;
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use std::{fmt::Display, net::SocketAddr};
-use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 // Quick instructions
 //
@@ -55,11 +54,11 @@ static KEYS: Lazy<Keys> = Lazy::new(|| {
 
 #[tokio::main]
 async fn main() {
-    tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG").unwrap_or_else(|_| "example_jwt=debug".into()),
-        ))
-        .with(tracing_subscriber::fmt::layer())
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
+                .unwrap_or_else(|_| "example_jwt=debug".into()),
+        )
         .init();
 
     let app = Router::new()