Add specific logging categories for Worker.Grpc and orchestration logs with backward-compatible opt-in

src/Worker/Core/DurableTaskWorkerOptions.cs

@@ -151,6 +151,20 @@ public DataConverter DataConverter
     [Obsolete("Experimental")]
     public IOrchestrationFilter? OrchestrationFilter { get; set; }
 
+    /// <summary>
+    /// Gets options for the Durable Task worker logging.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// Logging options control how logging categories are assigned to different components of the worker.
+    /// Starting from a future version, more specific logging categories will be used for better log filtering.
+    /// </para><para>
+    /// To maintain backward compatibility, legacy logging categories are emitted by default alongside the new
+    /// categories. This can be disabled by setting <see cref="LoggingOptions.UseLegacyCategories" /> to false.
+    /// </para>
+    /// </remarks>
+    public LoggingOptions Logging { get; } = new();
+
     /// <summary>
     /// Gets a value indicating whether <see cref="DataConverter" /> was explicitly set or not.
     /// </summary>
@@ -177,6 +191,7 @@ internal void ApplyTo(DurableTaskWorkerOptions other)
             other.EnableEntitySupport = this.EnableEntitySupport;
             other.Versioning = this.Versioning;
             other.OrchestrationFilter = this.OrchestrationFilter;
+            other.Logging.UseLegacyCategories = this.Logging.UseLegacyCategories;
         }
     }
 
@@ -229,4 +244,51 @@ public class VersioningOptions
         /// </remarks>
         public VersionFailureStrategy FailureStrategy { get; set; } = VersionFailureStrategy.Reject;
     }
+
+    /// <summary>
+    /// Options for the Durable Task worker logging.
+    /// </summary>
+    /// <remarks>
+    /// <para>
+    /// These options control how logging categories are assigned to different components of the worker.
+    /// Starting from a future version, more specific logging categories will be used for better log filtering:
+    /// <list type="bullet">
+    /// <item><description><c>Microsoft.DurableTask.Worker.Grpc</c> for gRPC worker logs (previously <c>Microsoft.DurableTask</c>)</description></item>
+    /// <item><description><c>Microsoft.DurableTask.Worker.*</c> for worker-specific logs</description></item>
+    /// </list>
+    /// </para><para>
+    /// To maintain backward compatibility, legacy logging categories are emitted by default alongside the new
+    /// categories until a future major release. This ensures existing log filters continue to work.
+    /// </para><para>
+    /// <b>Migration Path:</b>
+    /// <list type="number">
+    /// <item><description>Update your log filters to use the new, more specific categories</description></item>
+    /// <item><description>Test your application to ensure logs are captured correctly</description></item>
+    /// <item><description>Once confident, set <see cref="UseLegacyCategories" /> to <c>false</c> to disable legacy category emission</description></item>
+    /// </list>
+    /// </para>
+    /// </remarks>
+    public class LoggingOptions
+    {
+        /// <summary>
+        /// Gets or sets a value indicating whether to emit logs using legacy logging categories in addition to new categories.
+        /// </summary>
+        /// <remarks>
+        /// <para>
+        /// When <c>true</c> (default), logs are emitted to both the new specific categories (e.g., <c>Microsoft.DurableTask.Worker.Grpc</c>)
+        /// and the legacy broad categories (e.g., <c>Microsoft.DurableTask</c>). This ensures backward compatibility with existing
+        /// log filters and queries.
+        /// </para><para>
+        /// When <c>false</c>, logs are only emitted to the new specific categories, which provides better log organization
+        /// and filtering capabilities.
+        /// </para><para>
+        /// <b>Default:</b> <c>true</c> (legacy categories are enabled for backward compatibility)
+        /// </para><para>
+        /// <b>Breaking Change Warning:</b> Setting this to <c>false</c> is a breaking change if you have existing log filters,
+        /// queries, or monitoring rules that depend on the legacy category names. Ensure you update those before disabling
+        /// legacy categories.
+        /// </para>
+        /// </remarks>
+        public bool UseLegacyCategories { get; set; } = true;
+    }
 }

src/Worker/Grpc/DualCategoryLogger.cs

@@ -0,0 +1,93 @@
+// Copyright (c) Microsoft Corporation.
+// Licensed under the MIT License.
+
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.DurableTask.Worker.Grpc;
+
+/// <summary>
+/// A logger wrapper that emits logs to both a primary (new) category and an optional legacy category.
+/// </summary>
+/// <remarks>
+/// This logger is used to maintain backward compatibility while transitioning to more specific logging categories.
+/// When legacy categories are enabled, log messages are written to both the new specific category
+/// (e.g., "Microsoft.DurableTask.Worker.Grpc") and the legacy broad category (e.g., "Microsoft.DurableTask").
+/// </remarks>
+sealed class DualCategoryLogger : ILogger
+{
+    readonly ILogger primaryLogger;
+    readonly ILogger? legacyLogger;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="DualCategoryLogger"/> class.
+    /// </summary>
+    /// <param name="primaryLogger">The primary logger with the new category.</param>
+    /// <param name="legacyLogger">The optional legacy logger with the old category.</param>
+    public DualCategoryLogger(ILogger primaryLogger, ILogger? legacyLogger)
+    {
+        this.primaryLogger = Check.NotNull(primaryLogger);
+        this.legacyLogger = legacyLogger;
+    }
+
+    /// <inheritdoc/>
+    public IDisposable? BeginScope<TState>(TState state)
+        where TState : notnull
+    {
+        IDisposable? primaryScope = this.primaryLogger.BeginScope(state);
+        IDisposable? legacyScope = this.legacyLogger?.BeginScope(state);
+
+        if (primaryScope is not null && legacyScope is not null)
+        {
+            return new CompositeDisposable(primaryScope, legacyScope);
+        }
+
+        return primaryScope ?? legacyScope;
+    }
+
+    /// <inheritdoc/>
+    public bool IsEnabled(LogLevel logLevel)
+    {
+        // Return true if either logger is enabled at this level
+        return this.primaryLogger.IsEnabled(logLevel) ||
+               (this.legacyLogger?.IsEnabled(logLevel) ?? false);
+    }
+
+    /// <inheritdoc/>
+    public void Log<TState>(
+        LogLevel logLevel,
+        EventId eventId,
+        TState state,
+        Exception? exception,
+        Func<TState, Exception?, string> formatter)
+    {
+        // Log to primary logger
+        if (this.primaryLogger.IsEnabled(logLevel))
+        {
+            this.primaryLogger.Log(logLevel, eventId, state, exception, formatter);
+        }
+
+        // Log to legacy logger if enabled
+        if (this.legacyLogger?.IsEnabled(logLevel) ?? false)
+        {
+            this.legacyLogger.Log(logLevel, eventId, state, exception, formatter);
+        }
+    }
+
+    sealed class CompositeDisposable : IDisposable
+    {
+        readonly IDisposable first;
+        readonly IDisposable second;
+
+        public CompositeDisposable(IDisposable first, IDisposable second)
+        {
+            this.first = first;
+            this.second = second;
+        }
+
+        public void Dispose()
+        {
+            this.first.Dispose();
+            this.second.Dispose();
+        }
+    }
+}

src/Worker/Grpc/GrpcDurableTaskWorker.cs

@@ -45,7 +45,7 @@ public GrpcDurableTaskWorker(
         this.workerOptions = Check.NotNull(workerOptions).Get(name);
         this.services = Check.NotNull(services);
         this.loggerFactory = Check.NotNull(loggerFactory);
-        this.logger = loggerFactory.CreateLogger("Microsoft.DurableTask"); // TODO: use better category name.
+        this.logger = CreateLogger(loggerFactory, this.workerOptions);
         this.orchestrationFilter = orchestrationFilter;
         this.ExceptionPropertiesProvider = exceptionPropertiesProvider;
     }
@@ -103,4 +103,19 @@ AsyncDisposable GetCallInvoker(out CallInvoker callInvoker, out string address)
         address = c.Target;
         return new AsyncDisposable(() => new(c.ShutdownAsync()));
     }
+
+    static ILogger CreateLogger(ILoggerFactory loggerFactory, DurableTaskWorkerOptions options)
+    {
+        // Use the new, more specific category name for gRPC worker logs
+        ILogger primaryLogger = loggerFactory.CreateLogger("Microsoft.DurableTask.Worker.Grpc");
+
+        // If legacy categories are enabled, also emit logs to the old broad category
+        if (options.Logging.UseLegacyCategories)
+        {
+            ILogger legacyLogger = loggerFactory.CreateLogger("Microsoft.DurableTask");
+            return new DualCategoryLogger(primaryLogger, legacyLogger);
+        }
+
+        return primaryLogger;
+    }
 }