polish

docs/metrics/exemplars/Program.cs

@@ -12,7 +12,7 @@ public class Program
 {
     private static readonly ActivitySource MyActivitySource = new("OpenTelemetry.Demo.Exemplar");
     private static readonly Meter MyMeter = new("OpenTelemetry.Demo.Exemplar");
-    private static readonly Counter<long> MyFruitCounter = MyMeter.CreateCounter<long>("MyFruitCounter");
+    private static readonly Histogram<double> MyHistogram = MyMeter.CreateHistogram<double>("MyHistogram");
 
     public static void Main()
     {
@@ -32,6 +32,8 @@ public static void Main()
             })
             .Build();
 
+        var random = new Random();
+
         Console.WriteLine("Press any key to exit");
 
         while (!Console.KeyAvailable)
@@ -46,14 +48,10 @@ public static void Main()
                     child?.SetTag("key3", "value3");
                     child?.SetTag("key4", "value4");
 
-                    MyFruitCounter.Add(1, new("name", "apple"), new("color", "red"));
-                    MyFruitCounter.Add(1, new("name", "lemon"), new("color", "yellow"));
+                    MyHistogram.Record(random.NextDouble() * 100, new("tag1", "value1"), new("tag2", "value2"));
                 }
             }
 
-            MyFruitCounter.Add(2, new("name", "apple"), new("color", "green"));
-            MyFruitCounter.Add(4, new("name", "lemon"), new("color", "yellow"));
-
             Thread.Sleep(300);
         }
 

docs/metrics/exemplars/README.md

@@ -128,10 +128,11 @@ var meterProvider = Sdk.CreateMeterProviderBuilder()
 ## Use exemplars to navigate from metrics to traces
 
 Open Grafana, select Explore, and select Prometheus as the source. Select the
-metric named "MyFruitCounter_total", and plot the chart. Toggle on the
-"Exemplars" option from the UI and hit refresh.
+metric named `MyHistogram_bucket`, and plot the chart. Toggle on the "Exemplars"
+option from the UI and hit refresh.
 
-![Enable Exemplars](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/fc11fd4b-5601-4728-acdd-5129d75fbc04)
+![Enable
+Exemplars](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/3c2dab2f-7a0a-419f-88fe-b8010b4c69f8)
 
 The Exemplars appear as special "diamond shaped dots" along with the metric
 charts in the UI. Select any exemplar to see the exemplar data, which includes
@@ -140,7 +141,8 @@ context when the recording was done. The "trace_id" enables jumping to the
 tracing backed (Jaeger in this case). Click on the "Query with Jaeger" button
 next to the "trace_id" field to open the corresponding trace in Jaeger.
 
-![Navigate to trace with exemplar](https://user-images.githubusercontent.com/16979322/218629999-1d1cd6ba-2385-4683-975a-d4797df8361a.png)
+![Navigate to trace with
+exemplar](https://github.com/open-telemetry/opentelemetry-dotnet/assets/17327289/56bb5297-f744-41f3-bc35-8596392b8673)
 
 ## Learn more