fix(gateway): stabilize status snapshot output

src/gateway/http.rs

@@ -169,6 +169,14 @@ impl ApiError {
             message: error.to_string(),
         }
     }
+
+    fn internal_with_message(error: impl std::fmt::Display, message: impl Into<String>) -> Self {
+        tracing::error!(error = %error, "WebUI API request failed");
+        Self {
+            status: StatusCode::INTERNAL_SERVER_ERROR,
+            message: message.into(),
+        }
+    }
 }
 
 pub async fn upload_file(
@@ -714,6 +722,30 @@ fn scheduler_snapshot(jobs: &[crate::storage::ScheduledJob]) -> Value {
     })
 }
 
+fn scheduler_status_error(error: impl std::fmt::Display) -> ApiError {
+    ApiError::internal_with_message(error, "failed to load scheduler status")
+}
+
+fn channel_snapshot(mut channels: Vec<(String, bool)>) -> Vec<Value> {
+    channels.sort_by(|left, right| left.0.cmp(&right.0));
+    channels
+        .into_iter()
+        .map(|(name, running)| {
+            json!({
+                "name": name,
+                "status": if running { "connected" } else { "stopped" },
+            })
+        })
+        .collect()
+}
+
+fn sorted_providers(
+    mut providers: Vec<crate::observability::metrics::ProviderSnapshot>,
+) -> Vec<crate::observability::metrics::ProviderSnapshot> {
+    providers.sort_by(|left, right| left.name.cmp(&right.name));
+    providers
+}
+
 pub async fn get_status(State(state): State<Arc<GatewayState>>) -> Result<Json<Value>, ApiError> {
     let reload = state.reload.status();
     let metrics = crate::observability::metrics::global_metrics().snapshot();
@@ -728,24 +760,22 @@ pub async fn get_status(State(state): State<Arc<GatewayState>>) -> Result<Json<V
     let sessions_total = state.session_manager.session_count().await;
     let active_turns = state.session_manager.active_turn_count().await;
 
-    let mut channels = Vec::new();
+    let mut channel_states = Vec::new();
     for name in state.channel_manager.list_channel_names().await {
         let running = state
             .channel_manager
             .get_channel(&name)
             .await
             .is_some_and(|channel| channel.is_running());
-        channels.push(json!({
-            "name": name,
-            "status": if running { "connected" } else { "stopped" },
-        }));
+        channel_states.push((name, running));
     }
+    let channels = channel_snapshot(channel_states);
 
     let jobs = state
         .storage
         .list_scheduled_jobs()
         .await
-        .map_err(ApiError::internal)?;
+        .map_err(scheduler_status_error)?;
     let scheduler = scheduler_snapshot(&jobs);
     let mcp = crate::mcp::get_mcp_status()
         .into_iter()
@@ -783,7 +813,7 @@ pub async fn get_status(State(state): State<Arc<GatewayState>>) -> Result<Json<V
             "control": { "depth": depths.control_depth, "cap": depths.control_cap },
             "active_lanes": active_lanes,
         },
-        "providers": metrics.providers,
+        "providers": sorted_providers(metrics.providers),
         "channels": channels,
         "scheduler": scheduler,
         "mcp": mcp,
@@ -943,6 +973,54 @@ mod tests {
         );
     }
 
+    #[test]
+    fn channel_snapshot_is_sorted_and_maps_running_state() {
+        let channels = channel_snapshot(vec![
+            ("zeta".to_string(), false),
+            ("alpha".to_string(), true),
+        ]);
+
+        assert_eq!(
+            channels,
+            vec![
+                json!({ "name": "alpha", "status": "connected" }),
+                json!({ "name": "zeta", "status": "stopped" }),
+            ]
+        );
+    }
+
+    #[test]
+    fn provider_snapshot_is_sorted_by_name() {
+        let provider = |name: &str| crate::observability::metrics::ProviderSnapshot {
+            name: name.to_string(),
+            model: String::new(),
+            status: "ok".to_string(),
+            latency_ms: 0,
+            latencies: Vec::new(),
+            tokens_in: 0,
+            tokens_out: 0,
+            cost: 0.0,
+        };
+
+        let providers = sorted_providers(vec![provider("zeta"), provider("alpha")]);
+        assert_eq!(
+            providers
+                .iter()
+                .map(|provider| provider.name.as_str())
+                .collect::<Vec<_>>(),
+            vec!["alpha", "zeta"]
+        );
+    }
+
+    #[test]
+    fn scheduler_status_error_hides_internal_details() {
+        let error = scheduler_status_error("database contained private payload");
+
+        assert_eq!(error.status, StatusCode::INTERNAL_SERVER_ERROR);
+        assert_eq!(error.message, "failed to load scheduler status");
+        assert!(!error.message.contains("private payload"));
+    }
+
     #[test]
     fn secrets_are_redacted_and_restored() {
         let current = json!({"api_key":"real", "nested":{"access_token":"token"}, "safe":"yes"});