First upload, 18 controller version

app/core/diagnostics.py

@@ -0,0 +1,32 @@
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class RealtimeDiagnostics:
+    backend_id: str
+    backend_name: str
+    output_enabled: bool
+    worker_running: bool
+    target_output_fps: float
+    render_fps: float
+    send_fps: float
+    last_render_time_ms: float
+    last_send_time_ms: float
+    frames_rendered: int
+    frames_submitted: int
+    frames_sent: int
+    stale_frame_drops: int
+    send_failures: int
+    packets_last_frame: int
+    devices_last_frame: int
+    packets_sent_total: int
+    last_output_message: str = ""
+    send_budget_misses: int = 0
+    last_schedule_slip_ms: float = 0.0
+    controller_fps: float | None = None
+    controller_live_devices: int = 0
+    controller_sampled_devices: int = 0
+    controller_total_devices: int = 0
+    controller_source: str = ""