Set RUST_LOG=info as a default (#23925)

Set for all executables, rather than specifically for local-backend

GitOrigin-RevId: c0754eeabcedd72b6eb13dc271a132ee1c31d721

Justfile

@@ -20,7 +20,7 @@ set positional-arguments
 
 # (*) Run the open source convex backend on port 3210
 run-local-backend *ARGS:
-  RUST_LOG=${RUST_LOG:-info} cargo run -p local_backend --bin convex-local-backend -- "$@"
+  cargo run -p local_backend --bin convex-local-backend -- "$@"
 
 # Uses an admin key from admin_key.txt for dev backends.
 # This uses the default admin key for local backends, which is safe as long as the backend is

crates/cmd_util/src/env.rs

@@ -87,7 +87,9 @@ pub fn config_tool() -> TracingGuard {
             .boxed(),
     };
     let stdout = format_layer
-        .with_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .with_filter(
+            tracing_subscriber::EnvFilter::try_from_default_env().unwrap_or(EnvFilter::new("info")),
+        )
         .boxed();
     layers.push(stdout);
 

crates/local_backend/src/main.rs

@@ -37,9 +37,6 @@ use tokio::signal::{
 };
 
 fn main() -> Result<(), MainError> {
-    if std::env::var_os("RUST_LOG").is_none() {
-        std::env::set_var("RUST_LOG", "info");
-    }
     tracing::info!("Starting a local backend");
     let _guard = config_tool();
     let config = LocalConfig::parse();