Initial Metrics implementations

Author: eerhardt

src/StackExchange.Redis/PhysicalBridge.cs

@@ -350,6 +350,10 @@ internal string GetStormLog()
         internal void IncrementOpCount()
         {
             Interlocked.Increment(ref operationCount);
+
+#if NET6_0_OR_GREATER
+            RedisMetrics.Instance.IncrementOpCount(Name);
+#endif
         }
 
         internal void KeepAlive()

src/StackExchange.Redis/RedisMetrics.cs

@@ -0,0 +1,49 @@
+#if NET6_0_OR_GREATER
+
+using System.Collections.Generic;
+using System.Diagnostics.Metrics;
+
+namespace StackExchange.Redis;
+
+internal sealed class RedisMetrics
+{
+    private readonly Meter _meter;
+    private readonly Counter<long> _operationCount;
+    //private readonly Counter<long> _completedAsynchronously;
+    //private readonly Counter<long> _completedSynchronously;
+    //private readonly Counter<long> _failedSynchronously;
+
+    public static readonly RedisMetrics Instance = new RedisMetrics();
+
+    public RedisMetrics()
+    {
+        _meter = new Meter("StackExchange.Redis");
+
+        _operationCount = _meter.CreateCounter<long>(
+            "operation-count",
+            description: "The number of operations performed.");
+
+        //_completedAsynchronously = _meter.CreateCounter<long>(
+        //    "completed-asynchronously",
+        //    description: "The number of operations that have been completed asynchronously.");
+
+        //_completedSynchronously = _meter.CreateCounter<long>(
+        //    "completed-synchronously",
+        //    description: "The number of operations that have been completed synchronously.");
+
+        //_failedSynchronously = _meter.CreateCounter<long>(
+        //    "failed-synchronously",
+        //    description: "The number of operations that failed to complete asynchronously.");
+    }
+
+    public void IncrementOpCount(string connectionName)
+    {
+        if (_operationCount.Enabled)
+        {
+            _operationCount.Add(1,
+                new KeyValuePair<string, object?>("connection-name", connectionName));
+        }
+    }
+}
+
+#endif