array of tags instead of enumerable

src/EventStore.Core.XUnit.Tests/Index/IndexTrackerTests.cs

@@ -19,7 +19,7 @@ public class IndexTrackerTests : IDisposable {
 		_listener = new TestMeterListener<long>(meter);
 
 		var eventMetric = new CounterMetric(meter, "eventstore-io", "events");
-		_sut = new IndexTracker(new CounterSubmetric(eventMetric, new[] {new KeyValuePair<string, object>("activity", "written")}));
+		_sut = new IndexTracker(new CounterSubMetric(eventMetric, new[] {new KeyValuePair<string, object>("activity", "written")}));
 	}
 
 	public void Dispose() {

src/EventStore.Core.XUnit.Tests/TransactionLog/Chunks/TFChunkTrackerTests.cs

@@ -22,8 +22,8 @@ public class TFChunkTrackerTests : IDisposable {
 
 		var readTag = new KeyValuePair<string, object>("activity", "read");
 		_sut = new TFChunkTracker(
-			readBytes: new CounterSubmetric(byteMetric, new[] {readTag}),
-			readEvents: new CounterSubmetric(eventMetric, new[] {readTag}));
+			readBytes: new CounterSubMetric(byteMetric, new[] {readTag}),
+			readEvents: new CounterSubMetric(eventMetric, new[] {readTag}));
 	}
 
 	public void Dispose() {

src/EventStore.Core/Index/IndexTracker.cs

@@ -9,9 +9,9 @@ public interface IIndexTracker {
 	}
 
 	public class IndexTracker : IIndexTracker {
-		private readonly CounterSubmetric _indexedEvents;
+		private readonly CounterSubMetric _indexedEvents;
 
-		public IndexTracker(CounterSubmetric indexedEvents) {
+		public IndexTracker(CounterSubMetric indexedEvents) {
 			_indexedEvents = indexedEvents;
 		}
 

src/EventStore.Core/MetricsBootstrapper.cs

@@ -84,13 +84,13 @@ public static class MetricsBootstrapper {
 		if (conf.Events.TryGetValue(Conf.EventTracker.Read, out var readEnabled) && readEnabled) {
 			var readTag = new KeyValuePair<string, object>("activity", "read");
 			trackers.TransactionFileTracker = new TFChunkTracker(
-				readBytes: new CounterSubmetric(byteMetric, new[] {readTag}),
-				readEvents: new CounterSubmetric(eventMetric, new[] {readTag}));
+				readBytes: new CounterSubMetric(byteMetric, new[] {readTag}),
+				readEvents: new CounterSubMetric(eventMetric, new[] {readTag}));
 		}
 
 		// from a users perspective an event is written when it is indexed: thats when it can be read.
 		if (conf.Events.TryGetValue(Conf.EventTracker.Written, out var writtenEnabled) && writtenEnabled) {
-			trackers.IndexTracker = new IndexTracker(new CounterSubmetric(
+			trackers.IndexTracker = new IndexTracker(new CounterSubMetric(
 				eventMetric,
 				new[] {new KeyValuePair<string, object>("activity", "written")}));
 		}

src/EventStore.Core/Telemetry/CounterMetric.cs

@@ -3,23 +3,23 @@
 
 namespace EventStore.Core.Telemetry {
 	public class CounterMetric {
-		private readonly List<CounterSubmetric> _submetrics = new();
+		private readonly List<CounterSubMetric> _subMetrics = new();
 		private readonly object _lock = new();
 
 		public CounterMetric(Meter meter, string name, string unit = null) {
 			meter.CreateObservableCounter(name, Observe, unit);
 		}
 
-		public void Add(CounterSubmetric submetric) {
+		public void Add(CounterSubMetric subMetric) {
 			lock (_lock) {
-				_submetrics.Add(submetric);
+				_subMetrics.Add(subMetric);
 			}
 		}
 
 		private IEnumerable<Measurement<long>> Observe() {
 			lock (_lock) {
-				foreach (CounterSubmetric submetric in _submetrics) {
-					yield return submetric.Observe();
+				foreach (CounterSubMetric subMetric in _subMetrics) {
+					yield return subMetric.Observe();
 				}
 			}
 		}

src/EventStore.Core/Telemetry/CounterSubmetric.cs → src/EventStore.Core/Telemetry/CounterSubMetric.cs

@@ -5,11 +5,11 @@
 
 namespace EventStore.Core.Telemetry; 
 
-public class CounterSubmetric {
-	private readonly IEnumerable<KeyValuePair<string, object>> _tags;
+public class CounterSubMetric {
+	private readonly KeyValuePair<string, object>[] _tags;
 	private long _counter;
 
-	public CounterSubmetric(CounterMetric metric, IEnumerable<KeyValuePair<string, object>> tags) {
+	public CounterSubMetric(CounterMetric metric, KeyValuePair<string, object>[] tags) {
 		_tags = tags;
 		metric.Add(this);
 	}

src/EventStore.Core/TransactionLog/Chunks/TransactionFileTracker.cs

@@ -5,12 +5,12 @@
 namespace EventStore.Core.TransactionLog.Chunks;
 
 public class TFChunkTracker : ITransactionFileTracker {
-	private readonly CounterSubmetric _readBytes;
-	private readonly CounterSubmetric _readEvents;
+	private readonly CounterSubMetric _readBytes;
+	private readonly CounterSubMetric _readEvents;
 
 	public TFChunkTracker(
-		CounterSubmetric readBytes,
-		CounterSubmetric readEvents) {
+		CounterSubMetric readBytes,
+		CounterSubMetric readEvents) {
 
 		_readBytes = readBytes;
 		_readEvents = readEvents;