feat: accept RUST_LOG env filter

Cargo.lock

@@ -2057,6 +2057,15 @@ dependencies = [
  "hashify",
 ]
 
+[[package]]
+name = "matchers"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1525a2a28c7f4fa0fc98bb91ae755d1e2d1505079e05539e35bc876b5d65ae9"
+dependencies = [
+ "regex-automata",
+]
+
 [[package]]
 name = "matchit"
 version = "0.8.4"
@@ -3940,9 +3949,13 @@ version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2f30143827ddab0d256fd843b7a66d164e9f271cfa0dde49142c5ca0ca291f1e"
 dependencies = [
+ "matchers",
  "nu-ansi-term",
+ "once_cell",
+ "regex-automata",
  "sharded-slab",
  "thread_local",
+ "tracing",
  "tracing-core",
 ]
 

Cargo.toml

@@ -31,7 +31,7 @@ shellexpand = "3.1"
 
 # Logging - minimal
 tracing = { version = "0.1", default-features = false }
-tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt", "ansi"] }
+tracing-subscriber = { version = "0.3", default-features = false, features = ["fmt", "ansi", "env-filter"] }
 
 # Observability - Prometheus metrics
 prometheus = { version = "0.14", default-features = false }

src/main.rs

@@ -35,7 +35,7 @@
 use anyhow::{bail, Result};
 use clap::{Parser, Subcommand};
 use tracing::{info, Level};
-use tracing_subscriber::FmtSubscriber;
+use tracing_subscriber::{fmt, EnvFilter};
 
 mod agent;
 mod channels;
@@ -367,9 +367,11 @@ async fn main() -> Result<()> {
 
     let cli = Cli::parse();
 
-    // Initialize logging
-    let subscriber = FmtSubscriber::builder()
-        .with_max_level(Level::INFO)
+    // Initialize logging - respects RUST_LOG env var, defaults to INFO
+    let subscriber = fmt::Subscriber::builder()
+        .with_env_filter(
+            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
+        )
         .finish();
 
     tracing::subscriber::set_global_default(subscriber).expect("setting default subscriber failed");