improvement on gm windows, ai

apps/backend/Universe/Simulation/TelemetryService.cs

@@ -0,0 +1,44 @@
+using System.Diagnostics;
+
+namespace SpaceGame.Api.Universe.Simulation;
+
+public sealed class TelemetryService : IDisposable
+{
+  private readonly Process _process = Process.GetCurrentProcess();
+  private readonly Timer _timer;
+  private double _cpuPercent;
+  private DateTime _lastSampleTime;
+  private TimeSpan _lastCpuTime;
+
+  public TelemetryService()
+  {
+    _process.Refresh();
+    _lastSampleTime = DateTime.UtcNow;
+    _lastCpuTime = _process.TotalProcessorTime;
+    _timer = new Timer(Sample, null, TimeSpan.FromSeconds(1), TimeSpan.FromSeconds(1));
+  }
+
+  private void Sample(object? _)
+  {
+    _process.Refresh();
+    var now = DateTime.UtcNow;
+    var cpu = _process.TotalProcessorTime;
+    var elapsed = (now - _lastSampleTime).TotalSeconds;
+    var cpuUsed = (cpu - _lastCpuTime).TotalSeconds;
+    Volatile.Write(ref _cpuPercent, elapsed > 0 ? cpuUsed / elapsed / Environment.ProcessorCount * 100.0 : 0);
+    _lastSampleTime = now;
+    _lastCpuTime = cpu;
+  }
+
+  public double CpuPercent => Volatile.Read(ref _cpuPercent);
+  public long WorkingSetBytes => _process.WorkingSet64;
+  public long GcMemoryBytes => GC.GetTotalMemory(false);
+  public int ThreadCount => _process.Threads.Count;
+  public TimeSpan Uptime => DateTime.UtcNow - _process.StartTime.ToUniversalTime();
+
+  public void Dispose()
+  {
+    _timer.Dispose();
+    _process.Dispose();
+  }
+}