update

libmarlin/src/logging.rs

@@ -0,0 +1,17 @@
+use tracing_subscriber::{fmt, EnvFilter};
+
+/// Initialise global tracing subscriber.
+///
+/// Reads `RUST_LOG` for filtering, falls back to `info`.
+pub fn init() {
+    let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info"));
+
+    // All tracing output (INFO, WARN, ERROR …) now goes to *stderr* so the
+    // integration tests can assert on warnings / errors reliably.
+    fmt()
+        .with_target(false)        // hide module targets
+        .with_level(true)          // include log level
+        .with_env_filter(filter)   // respect RUST_LOG
+        .with_writer(std::io::stderr) // <-- NEW: send to stderr
+        .init();
+}