Refactor initializing tracing-subscriber

examples/rest-grpc-multiplex/src/main.rs

@@ -12,7 +12,6 @@ use proto::{
 };
 use std::net::SocketAddr;
 use tonic::{Response as TonicResponse, Status};
-use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
 
 mod multiplex_service;
 
@@ -46,12 +45,11 @@ async fn web_root() -> &'static str {
 #[tokio::main]
 async fn main() {
     // initialize tracing
-    tracing_subscriber::registry()
-        .with(tracing_subscriber::EnvFilter::new(
-            std::env::var("RUST_LOG")
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env()
                 .unwrap_or_else(|_| "example_rest_grpc_multiplex=debug".into()),
-        ))
-        .with(tracing_subscriber::fmt::layer())
+        )
         .init();
 
     // build the rest service