Enable SqlClient metrics

Metrics become opt-in in 1.10.0-beta.1 and changed name.

Author: martincostello

docker/docker-compose-aspnetcore/oats.yaml

@@ -14,9 +14,8 @@ expected:
       contains:
         - 'Application started'
   metrics:
-    # Investigate why this fails
-    #- promql: db_client_operation_duration{}
-    #  value: '>= 0'
+    - promql: db_client_operation_duration_seconds_count{}
+      value: '>= 0'
     - promql: http_client_request_duration_seconds_count{}
       value: '>= 0'
     - promql: http_client_request_duration_seconds_count{http_request_method="GET", http_response_status_code="200"}

src/Grafana.OpenTelemetry.Base/Instrumentations/SqlClientInitializer.cs

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
+using OpenTelemetry.Metrics;
 using OpenTelemetry.Trace;
 
 namespace Grafana.OpenTelemetry
@@ -11,6 +12,11 @@ internal class SqlClientInitializer : InstrumentationInitializer
     {
         public override Instrumentation Id { get; } = Instrumentation.SqlClient;
 
+        protected override void InitializeMetrics(MeterProviderBuilder builder)
+        {
+            builder.AddSqlClientInstrumentation();
+        }
+
         protected override void InitializeTracing(TracerProviderBuilder builder)
         {
             builder.AddSqlClientInstrumentation();