v0.29.6

src/logging/model.rs

@@ -328,6 +328,7 @@ pub struct ErrorLogStats {
 #[derive(Debug)]
 struct ErrorEvent {
     timestamp: String,
+    level: String,
     target: String,
     message: String,
     fields: BTreeMap<String, String>,
@@ -369,9 +370,23 @@ impl ErrorLogController {
         self.settings.store(Arc::new(settings));
         self.settings_changed.send_replace(());
     }
+    /// All diagnostics go to stderr when file logging is disabled. With a file
+    /// configured, warnings/errors go only to that file (unless the sink fails).
+    /// Informational startup messages remain on the console.
+    pub fn console_enabled_for(&self, level: &Level) -> bool {
+        !matches!(*level, Level::WARN | Level::ERROR) || !self.settings.load().enabled
+    }
     fn push(&self, event: ErrorEvent) {
-        if self.settings.load().enabled && self.sender.try_send(event).is_err() {
+        let config = self.settings.load();
+        if !config.enabled {
+            return;
+        }
+        if let Err(error) = self.sender.try_send(event) {
             self.dropped.fetch_add(1, Ordering::Relaxed);
+            // An overloaded/closed sink must not silently swallow a diagnostic
+            // suppressed by the console filter. This emergency path is bounded
+            // to one event and only runs on a failed non-blocking enqueue.
+            write_error_fallback(&error.into_inner(), config.format);
         }
     }
     pub fn stats(&self) -> ErrorLogStats {
@@ -451,7 +466,7 @@ impl tracing::field::Visit for EventVisitor {
 }
 impl<S: Subscriber> Layer<S> for ErrorLogLayer {
     fn on_event(&self, event: &Event<'_>, _ctx: LayerContext<'_, S>) {
-        if *event.metadata().level() != Level::ERROR {
+        if !matches!(*event.metadata().level(), Level::ERROR | Level::WARN) {
             return;
         }
         let mut visitor = EventVisitor::default();
@@ -466,6 +481,7 @@ impl<S: Subscriber> Layer<S> for ErrorLogLayer {
         }
         self.controller.push(ErrorEvent {
             timestamp: rfc3339_now(),
+            level: event.metadata().level().as_str().to_owned(),
             target: event.metadata().target().to_owned(),
             message: redact_text(visitor.message.as_deref().unwrap_or("error")),
             fields,