OTEL POC

Projects/Server/Main.cs

@@ -417,6 +417,8 @@ public static class Core
 
         VerifySerialization();
 
+        Telemetry.Start();
+
         _now = DateTime.UtcNow;
         _firstTick = _tickCount = GetTimestamp();
 

Projects/Server/Mobiles/Mobile.cs

@@ -28,6 +28,7 @@ using Server.Targeting;
 using Server.Text;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.Metrics;
 using System.Runtime.CompilerServices;
 using CalcMoves = Server.Movement.Movement;
 
@@ -196,6 +197,10 @@ public delegate int AOSStatusHandler(Mobile from, int index);
 /// </summary>
 public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPropertyListEntity, IValueLinkListNode<Mobile>
 {
+    private static readonly Counter<long> mobilesCreatedCounter = Telemetry.MobilesMeter.CreateCounter<long>("mobiles_created_count");
+    private static readonly Counter<long> mobilesDeletedCounter = Telemetry.MobilesMeter.CreateCounter<long>("mobiles_deleted_count");
+    private static readonly Counter<long> mobilesKilledCounter = Telemetry.MobilesMeter.CreateCounter<long>("mobiles_killed_count");
+
     // Allow four warmode changes in 0.5 seconds, any more will be delay for two seconds
     private const int WarmodeCatchCount = 4;
 
@@ -364,6 +369,11 @@ public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPro
         DefaultMobileInit();
 
         World.AddEntity(this);
+
+        mobilesCreatedCounter.Add(1, new KeyValuePair<string, object?>[]
+        {
+            new("Map", Map?.Name),
+        });
     }
 
     public Mobile(Serial serial)
@@ -2421,6 +2431,14 @@ public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPro
 
         Region.OnRegionChange(this, m_Region, null);
 
+        if (Alive) {
+            mobilesDeletedCounter.Add(1, new KeyValuePair<string, object?>[]
+            {
+                new("Map", Map?.Name),
+                new("Region", Region?.Name),
+            });
+        }
+
         m_Region = null;
         // Is the above line REALLY needed?  The old Region system did NOT have said line
         // and worked fine, because of this a LOT of extra checks have to be done everywhere...
@@ -4801,6 +4819,13 @@ public partial class Mobile : IHued, IComparable<Mobile>, ISpawnable, IObjectPro
             }
         }
 
+        mobilesKilledCounter.Add(1, new KeyValuePair<string, object?>[]
+        {
+            new("Map", Map?.Name),
+            new("Region", Region?.Name),
+            new("IsPlayer", Player),
+        });
+
         Region.OnDeath(this);
         OnDeath(c);
     }

Projects/Server/Server.csproj

@@ -35,6 +35,8 @@
     <ItemGroup>
         <PackageReference Include="CommunityToolkit.HighPerformance" Version="8.3.2" />
         <PackageReference Include="LibDeflate.Bindings" Version="1.0.2.120" />
+        <PackageReference Include="OpenTelemetry" Version="1.10.0-beta.1" />
+        <PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.10.0-beta.1" />
         <PackageReference Include="PollGroup" Version="1.5.1" />
         <PackageReference Include="System.IO.Hashing" Version="8.0.0" />
 

Projects/Server/Telemetry.cs

@@ -0,0 +1,36 @@
+using System;
+using System.Diagnostics.Metrics;
+using OpenTelemetry;
+using OpenTelemetry.Metrics;
+using OpenTelemetry.Resources;
+
+namespace Server;
+
+public class Telemetry
+{
+    public static MeterProvider MeterProvider { get; private set; }
+    public static readonly Meter AccountingMeter = new("ModernUO.Accounting");
+    public static readonly Meter ItemsMeter = new("ModernUO.Items");
+    public static readonly Meter MobilesMeter = new("ModernUO.Mobiles");
+    public static readonly Meter EconomyMeter = new("ModernUO.Economy");
+
+    public static void Start()
+    {
+        MeterProvider = Sdk.CreateMeterProviderBuilder()
+            .ConfigureResource(r => r.AddService("ModernUO"))
+            .AddOtlpExporter(options =>
+            {
+                options.BatchExportProcessorOptions.ScheduledDelayMilliseconds = TimeSpan.FromSeconds(10.0).Milliseconds;
+            })
+            .AddMeter("ModernUO.Accounting")
+            .AddMeter("ModernUO.Items")
+            .AddMeter("ModernUO.Mobiles")
+            .AddMeter("ModernUO.Economy")
+            .AddView(
+                "gold_created_histogram",
+                new ExplicitBucketHistogramConfiguration()
+                    { Boundaries = new double[] { 100, 200, 300, 400, 500, 700, 1000, 1500, 2000 } }
+            )
+            .Build();
+    }
+}