add opentelemetry as a logging provider option

Author: PhilBastian

src/ServiceControl.Audit/App.config

@@ -22,7 +22,7 @@ These settings are only here so that we can debug ServiceControl while developin
     <add key="ServiceControl.Audit/PersistenceType" value="InMemory" />
     <!--<add key="ServiceControl.Audit/PersistenceType" value="RavenDB" />-->
 
-	<!-- options are any comma separated combination of NLog,Seq -->
+	<!-- options are any comma separated combination of NLog,Seq,Otlp -->
 	<add key="ServiceControl.Audit/LoggingProviders" value="NLog,Seq"/>
 	<add key="ServiceControl.Audit/SeqAddress" value="http://localhost:5341"/>
   </appSettings>

src/ServiceControl.Infrastructure/LoggerUtil.cs

@@ -4,6 +4,7 @@
     using Microsoft.Extensions.DependencyInjection;
     using Microsoft.Extensions.Logging;
     using NLog.Extensions.Logging;
+    using OpenTelemetry.Logs;
     using ServiceControl.Infrastructure.TestLogger;
 
     [Flags]
@@ -13,6 +14,7 @@ public enum Loggers
         Test = 1 << 0,
         NLog = 1 << 1,
         Seq = 1 << 2,
+        Otlp = 1 << 3,
     }
 
     public static class LoggerUtil
@@ -47,6 +49,10 @@ public static void BuildLogger(this ILoggingBuilder loggingBuilder, LogLevel lev
                     loggingBuilder.AddSeq();
                 }
             }
+            if (IsLoggingTo(Loggers.Otlp))
+            {
+                loggingBuilder.AddOpenTelemetry(configure => configure.AddOtlpExporter());
+            }
 
             loggingBuilder.SetMinimumLevel(level);
         }

src/ServiceControl.Infrastructure/LoggingSettings.cs

@@ -26,6 +26,10 @@ public LoggingSettings(SettingsRootNamespace rootNamespace, LogLevel defaultLeve
                 LoggerUtil.SeqAddress = seqAddress;
             }
         }
+        if (loggingProviders.Contains("Otlp"))
+        {
+            activeLoggers |= Loggers.Otlp;
+        }
         //this defaults to NLog because historically that was the default, and we don't want to break existing installs that don't have the config key to define loggingProviders
         LoggerUtil.ActiveLoggers = activeLoggers == Loggers.None ? Loggers.NLog : activeLoggers;
 

src/ServiceControl.Monitoring/App.config

@@ -19,7 +19,7 @@ These settings are only here so that we can debug ServiceControl while developin
     <!--<add key="Monitoring/TransportType" value="RabbitMQ.QuorumConventionalRouting" />-->
     <!--<add key="Monitoring/TransportType" value="SQLServer" />-->
 
-	<!-- options are any comma separated combination of NLog,Seq -->
+	<!-- options are any comma separated combination of NLog,Seq,Otlp -->
 	<add key="Monitoring/LoggingProviders" value="NLog,Seq"/>
 	<add key="Monitoring/SeqAddress" value="http://localhost:5341"/>
   </appSettings>

src/ServiceControl/App.config

@@ -24,7 +24,7 @@ These settings are only here so that we can debug ServiceControl while developin
 
     <add key="ServiceControl/PersistenceType" value="RavenDB" />
 
-	<!-- options are any comma separated combination of NLog,Seq -->
+	<!-- options are any comma separated combination of NLog,Seq,Otlp -->
 	<add key="ServiceControl/LoggingProviders" value="NLog,Seq"/>
 	<add key="ServiceControl/SeqAddress" value="http://localhost:5341"/>
   </appSettings>