Metric setup moved to extension method

Author: ramonsmits

src/ServiceControl.Audit/HostApplicationBuilderExtensions.cs

@@ -82,7 +82,7 @@ public static void AddServiceControlAudit(this IHostApplicationBuilder builder,
                     autoGenerateServiceInstanceId: true))
                 .WithMetrics(b =>
                 {
-                    b.AddMeter(Telemetry.MeterName);
+                    b.AddAuditIngestionMeters();
                     b.AddOtlpExporter(e =>
                     {
                         e.Endpoint = otelMetricsUri;

src/ServiceControl.Audit/Infrastructure/Telemetry.cs

@@ -1,11 +1,17 @@
 namespace ServiceControl.Audit;
 
 using System.Diagnostics.Metrics;
+using OpenTelemetry.Metrics;
 
 static class Telemetry
 {
-    public const string MeterName = "Particular.ServiceControl.Audit";
+    const string MeterName = "Particular.ServiceControl.Audit";
     public static readonly Meter Meter = new(MeterName, "0.1.0");
 
     public static string CreateInstrumentName(string instrumentNamespace, string instrumentName) => $"sc.audit.{instrumentNamespace}.{instrumentName}".ToLower();
+
+    public static void AddAuditIngestionMeters(this MeterProviderBuilder builder)
+    {
+        builder.AddMeter(MeterName);
+    }
 }