Add atmos tick time to atmos device update event (#18781)

Content.Server/Atmos/EntitySystems/AtmosphereSystem.CVars.cs

@@ -21,6 +21,12 @@ namespace Content.Server.Atmos.EntitySystems
         public bool ExcitedGroupsSpaceIsAllConsuming { get; private set; }
         public float AtmosMaxProcessTime { get; private set; }
         public float AtmosTickRate { get; private set; }
+
+        /// <summary>
+        /// Time between each atmos sub-update.  If you are writing an atmos device, use AtmosDeviceUpdateEvent.dt
+        /// instead of this value, because atmos devices do not update each are sub-update and sometimes are skipped to
+        /// meet the tick deadline.
+        /// </summary>
         public float AtmosTime => 1f / AtmosTickRate;
 
         private void InitializeCVars()

Content.Server/Atmos/EntitySystems/AtmosphereSystem.Processing.cs

@@ -14,7 +14,6 @@ namespace Content.Server.Atmos.EntitySystems
     {
         [Dependency] private readonly IGameTiming _gameTiming = default!;
 
-        private readonly AtmosDeviceUpdateEvent _updateEvent = new();
         private readonly Stopwatch _simulationStopwatch = new();
 
         /// <summary>
@@ -337,7 +336,7 @@ namespace Content.Server.Atmos.EntitySystems
             var number = 0;
             while (atmosphere.CurrentRunAtmosDevices.TryDequeue(out var device))
             {
-                RaiseLocalEvent(device.Owner, _updateEvent, false);
+                RaiseLocalEvent(device.Owner, new AtmosDeviceUpdateEvent(AtmosTime * (int)AtmosphereProcessingState.NumStates), false);
                 device.LastProcess = time;
 
                 if (number++ < LagCheckIterations) continue;
@@ -509,5 +508,6 @@ namespace Content.Server.Atmos.EntitySystems
         Superconductivity,
         PipeNet,
         AtmosDevices,
+        NumStates
     }
 }