Fix memory pool metrics unit to follow standard (dotnet#62766)

Author: JamesNK

src/Servers/Kestrel/Core/test/PinnedBlockMemoryPoolTests.cs

@@ -231,7 +231,7 @@ public async Task EvictionsAreScheduled()
     public void CurrentMemoryMetricTracksPooledMemory()
     {
         var testMeterFactory = new TestMeterFactory();
-        using var currentMemoryMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memorypool.current_memory");
+        using var currentMemoryMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memory_pool.current_memory");
 
         var pool = new PinnedBlockMemoryPool(testMeterFactory);
 
@@ -267,7 +267,7 @@ public void CurrentMemoryMetricTracksPooledMemory()
     public void TotalAllocatedMetricTracksAllocatedMemory()
     {
         var testMeterFactory = new TestMeterFactory();
-        using var totalMemoryMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memorypool.total_allocated");
+        using var totalMemoryMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memory_pool.total_allocated");
 
         var pool = new PinnedBlockMemoryPool(testMeterFactory);
 
@@ -290,7 +290,7 @@ public void TotalAllocatedMetricTracksAllocatedMemory()
     public void TotalRentedMetricTracksRentOperations()
     {
         var testMeterFactory = new TestMeterFactory();
-        using var rentMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memorypool.total_rented");
+        using var rentMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memory_pool.total_rented");
 
         var pool = new PinnedBlockMemoryPool(testMeterFactory);
 
@@ -315,7 +315,7 @@ public void TotalRentedMetricTracksRentOperations()
     public void EvictedMemoryMetricTracksEvictedMemory()
     {
         var testMeterFactory = new TestMeterFactory();
-        using var evictMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memorypool.evicted_memory");
+        using var evictMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memory_pool.evicted_memory");
 
         var pool = new PinnedBlockMemoryPool(testMeterFactory);
 
@@ -352,7 +352,7 @@ public void EvictedMemoryMetricTracksEvictedMemory()
     public void MetricsAreAggregatedAcrossPoolsWithSameMeterFactory()
     {
         var testMeterFactory = new TestMeterFactory();
-        using var rentMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memorypool.total_rented");
+        using var rentMetric = new MetricCollector<long>(testMeterFactory, "Microsoft.AspNetCore.MemoryPool", "aspnetcore.memory_pool.total_rented");
 
         var pool1 = new PinnedBlockMemoryPool(testMeterFactory);
         var pool2 = new PinnedBlockMemoryPool(testMeterFactory);

src/Shared/Buffers.MemoryPool/PinnedBlockMemoryPoolMetrics.cs

@@ -22,23 +22,23 @@ public PinnedBlockMemoryPoolMetrics(IMeterFactory meterFactory)
         _meter = meterFactory.Create(MeterName);
 
         _currentMemory = _meter.CreateUpDownCounter<long>(
-            "aspnetcore.memorypool.current_memory",
-            unit: "{bytes}",
+            "aspnetcore.memory_pool.current_memory",
+            unit: "By",
             description: "Number of bytes that are currently pooled by the pool.");
 
         _totalAllocatedMemory = _meter.CreateCounter<long>(
-           "aspnetcore.memorypool.total_allocated",
-            unit: "{bytes}",
+           "aspnetcore.memory_pool.total_allocated",
+            unit: "By",
             description: "Total number of allocations made by the pool.");
 
         _evictedMemory = _meter.CreateCounter<long>(
-           "aspnetcore.memorypool.evicted_memory",
-            unit: "{bytes}",
+           "aspnetcore.memory_pool.evicted_memory",
+            unit: "By",
             description: "Total number of bytes that have been evicted.");
 
         _totalRented = _meter.CreateCounter<long>(
-            "aspnetcore.memorypool.total_rented",
-            unit: "{bytes}",
+            "aspnetcore.memory_pool.total_rented",
+            unit: "By",
             description: "Total number of rented bytes from the pool.");
     }