fix(managed): expose dropped subscription events

Track a monotonic discarded-event count per bounded subscription for all overflow policies, including after hub sealing or disconnection. Preserve nonblocking publication and existing queue policies.

Warn once in streaming CLI output and mark TUI summaries/status as incomplete when DropOldest discarded events. Add exact overflow-counter and incomplete-marker regressions.

crates/irtt-cli/src/cmd/tui/run.rs

@@ -242,6 +242,7 @@ fn run_group_tui(
             }
         }
     }
+    state.mark_dropped_events(events.dropped_events());
     for target in &outcome.targets {
         if terminal_targets.insert(target.id.as_str().to_owned()) {
             state.process_target_outcome(target);

crates/irtt-cli/src/cmd/tui/ui.rs

@@ -96,6 +96,7 @@ pub(super) struct TuiState {
     targets: Vec<TuiTargetState>,
     recent_events: VecDeque<String>,
     last_warning: Option<String>,
+    dropped_events: u64,
     graph_metric: GraphMetric,
     graph_viewport: GraphViewport,
     view: TuiView,
@@ -130,6 +131,7 @@ impl TuiState {
             targets,
             recent_events: VecDeque::with_capacity(RECENT_EVENT_LIMIT),
             last_warning: None,
+            dropped_events: 0,
             graph_metric: GraphMetric::EffectiveRtt,
             graph_viewport: GraphViewport::default(),
             view: TuiView::Graph,
@@ -386,6 +388,17 @@ impl TuiState {
         self.status = status;
     }
 
+    pub(super) fn mark_dropped_events(&mut self, dropped_events: u64) {
+        if dropped_events == 0 {
+            return;
+        }
+        self.dropped_events = dropped_events;
+        let warning =
+            format!("dropped {dropped_events} managed group events; statistics may be incomplete");
+        self.last_warning = Some(warning.clone());
+        self.push_event(format!("warning {warning}"));
+    }
+
     pub(super) fn set_error(&mut self, message: String) {
         self.status = TuiStatus::Error;
         self.last_warning = Some(message.clone());
@@ -1811,6 +1824,11 @@ fn status_line(state: &TuiState) -> Paragraph<'_> {
         TuiView::Graph => "g dashboard",
         TuiView::Dashboard => "g graph",
     };
+    let incomplete = if state.dropped_events > 0 {
+        format!(" incomplete:dropped={}", state.dropped_events)
+    } else {
+        String::new()
+    };
     let controls = if state.graph_viewport.mode == GraphViewportMode::Follow {
         format!(
             "q quit | r reset | p pause | {view_hint} | m metric | arrows pan | +/- zoom | 0 reset window"
@@ -1821,10 +1839,11 @@ fn status_line(state: &TuiState) -> Paragraph<'_> {
         )
     };
     let lines = vec![Line::from(format!(
-        "{}{}{} | {}",
+        "{}{}{}{} | {}",
         state.status.label(),
         paused,
         quitting,
+        incomplete,
         controls
     ))];
     Paragraph::new(lines).block(Block::default().borders(Borders::ALL))
@@ -2451,6 +2470,23 @@ mod tests {
             .contains("warning WrongToken: wrong token"));
     }
 
+    #[test]
+    fn dropped_events_mark_tui_statistics_incomplete() {
+        let mut state = TuiState::default();
+
+        state.mark_dropped_events(9);
+
+        assert_eq!(state.dropped_events, 9);
+        assert!(state
+            .last_warning
+            .as_deref()
+            .is_some_and(|warning| warning.contains("statistics may be incomplete")));
+        assert!(state
+            .recent_events
+            .back()
+            .is_some_and(|event| event.contains("dropped 9 managed group events")));
+    }
+
     #[test]
     fn recent_event_buffer_stays_bounded() {
         let mut state = TuiState::default();