OTLP LogExporter to support ILogger Scopes (#3218)

docs/logs/getting-started/Program.cs

@@ -25,8 +25,10 @@ public class Program
     {
         using var loggerFactory = LoggerFactory.Create(builder =>
         {
-            builder.AddOpenTelemetry(options => options
-                .AddConsoleExporter());
+            builder.AddOpenTelemetry(options =>
+            {
+                options.AddConsoleExporter();
+            });
         });
 
         var logger = loggerFactory.CreateLogger<Program>();

examples/Console/TestLogs.cs

@@ -29,6 +29,7 @@ namespace Examples.Console
                 builder.AddOpenTelemetry((opt) =>
                 {
                     opt.IncludeFormattedMessage = true;
+                    opt.IncludeScopes = true;
                     if (options.UseExporter.Equals("otlp", StringComparison.OrdinalIgnoreCase))
                     {
                         /*
@@ -68,7 +69,12 @@ namespace Examples.Console
             });
 
             var logger = loggerFactory.CreateLogger<Program>();
-            logger.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
+            using (logger.BeginScope("My scope 1 with {food} and {color}", "apple", "green"))
+            using (logger.BeginScope("My scope 2 with {food} and {color}", "banana", "yellow"))
+            {
+                logger.LogInformation("Hello from {name} {price}.", "tomato", 2.99);
+            }
+
             return null;
         }
     }

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## Unreleased
 
+* LogExporter to support Logging Scopes.
+  ([#3277](https://github.com/open-telemetry/opentelemetry-dotnet/pull/3217))
+
 ## 1.3.0-beta.1
 
 Released 2022-Apr-15

src/OpenTelemetry.Exporter.OpenTelemetryProtocol/Implementation/LogRecordExtensions.cs

@@ -15,6 +15,7 @@
 // </copyright>
 
 using System;
+using System.Collections.Generic;
 using System.Runtime.CompilerServices;
 using Google.Protobuf;
 using Google.Protobuf.Collections;
@@ -132,8 +133,19 @@ namespace OpenTelemetry.Exporter.OpenTelemetryProtocol.Implementation
                     otlpLogRecord.Flags = (uint)logRecord.TraceFlags;
                 }
 
-                // TODO: Add additional attributes from scope and state
-                // Might make sense to take an approach similar to https://github.com/open-telemetry/opentelemetry-dotnet-contrib/blob/897b734aa5ea9992538f04f6ea6871fe211fa903/src/OpenTelemetry.Contrib.Preview/Internal/DefaultLogStateConverter.cs
+                int scopeDepth = -1;
+                logRecord.ForEachScope(ProcessScope, otlpLogRecord);
+
+                void ProcessScope(LogRecordScope scope, OtlpLogs.LogRecord otlpLog)
+                {
+                    scopeDepth++;
+                    foreach (var scopeItem in scope)
+                    {
+                        var scopeItemWithDepthInfo = new KeyValuePair<string, object>($"[Scope.{scopeDepth}]:{scopeItem.Key}", scopeItem.Value);
+                        var otlpAttribute = scopeItemWithDepthInfo.ToOtlpAttribute();
+                        otlpLog.Attributes.Add(otlpAttribute);
+                    }
+                }
             }
             catch (Exception ex)
             {