Revamp issue-labeler project #13310

MaiLinhP · 2025-12-10T22:40:37Z

Added an `AzureSdkIssueGeneratorService` Function App that will reference azure-sdk-for-net issues to generate synthetic issues for other repos and add TSV file to blob storage for model training if needed.

Replaced all old ML labeler processes with streamlined `IssueLabelerMLPipeline`. Most of this pipeline is meant to be run locally for more control over model training processes. It includes:

Downloader: Download applicable issues to local .tsv file.
Trainer: Use downloaded issues (along with synthetic issues generated from AzureSdkIssueGeneratorService if available) to train Category and Service models. This will also provide per label statistics as well as a list of labels that need more data for training. This list can be passed back into AzureSdkIssueGeneratorService to generate issues with specific labels.
Predictor: Use the category and service model zip files produced from Trainer to predict issues.
Tester: Test models on all labeled issues for # of matches, mismatches, and no predictions. Also provides statistics on how models perform.
DevOpsModelRetrainer: Process to be handed to DevOps team to periodically retrain models automatically. This download issues, train models along with synthetic data if any, then replace current models with new ones.

Unified config setup.

Previously, most function app configs use {org}/{repo}:{key} or defaults:{key}. However, as ModelHolderFactory is a singleton and didn't have per repo config at runtime, we were doing roundabout logics to configure model files (check old LegacyLabeler and IModelHolderFactoryLite.cs for details). Per repo config is now available to ModelHolderFactory, which simplifies many configs and cut out unnecessary name translation/extraction logic.

Simplified the flow from `AzureSdkIssueLabelerService` to `Labeler`.

Previously, there were many layers - ModelHolder, ModelHolderFactory, ModelHolderFactoryLite, Labeler, LabelerLite, LegacyLabeler. Replaced LegacyLabeler with MLLabeler, simplified the rest down to ModelHolder and ModelHolderFactory.

Previously, ModelHolder was also unaware of which label type it is, and the ordering of service vs category models in ModelHolderFactory was dictated by order listed in defaults:IssueModel.{repo}.BlobConfigNames. This made code unreadable without constantly referencing app config. ModelHolder now has modelType which makes ordering irrelevant, simplifies call to config and making code much more readable.

Cleaned up codebase

Deleted all unused references and refactored functions.

…works with repo specific Configuration

…es to blob storage

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Copilot

Pull request overview

This PR represents a significant architectural refactoring of the issue-labeler project, replacing legacy ML labeling infrastructure with a modern streamlined pipeline approach.

Key Changes

New Synthetic Issue Generation: Added AzureSdkIssueGeneratorService Function App to generate synthetic issues from azure-sdk-for-net issues for improved model training
Streamlined ML Pipeline: Replaced old ML labeler processes with IssueLabelerMLPipeline containing local tools for downloading, training, testing, and predicting issue labels
Simplified Architecture: Removed Hubbup.MikLabelModel project and replaced LegacyLabeler with MLLabeler, eliminating multiple abstraction layers and simplifying the codebase
Unified Configuration: Consolidated config setup with per-repository support in ModelHolderFactory, removing complex name translation logic

Reviewed changes

Copilot reviewed 123 out of 123 changed files in this pull request and generated 28 comments.

Show a summary per file

File	Description
`IssueLabelerService/Labelers/MLLabeler.cs`	New ML labeler replacing LegacyLabeler with simplified prediction logic
`IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs`	New issue generator service for creating synthetic training data
`IssueLabelerMLPipeline/src/`	Complete new ML pipeline with Downloader, Trainer, Predictor, Tester, and DevOpsModelRetrainer tools
`IssueLabeler.Shared/ModelHolder.cs`	Refactored to include modelType awareness and simplified blob loading
`IssueLabeler.Shared/IModelHolderFactory.cs`	New interface with per-repository configuration support
`Hubbup.MikLabelModel/`	Entire project and dependencies removed
`tests/Hubbup.MikLabelModel.Tests/`	Test project removed as part of cleanup

Comments suppressed due to low confidence (2)

tools/issue-labeler/src/IssueLabelerService/AzureSdkIssueGeneratorService.cs:46

This assignment to result is useless, since its value is never read.
tools/issue-labeler/src/IssueLabelerService/AzureSdkIssueGeneratorService.cs:51
This assignment to answer is useless, since its value is never read.

Copilot · 2025-12-10T22:50:43Z

tools/issue-labeler/src/IssueLabelerService/AzureSdkIssueGeneratorService.cs

+            }
+
+            var config = _configurationService.GetDefault();
+            TriageOutput result = new TriageOutput {};


Unused variable 'result' is created but never used. The return statement from the issue generator service is assigned to 'answer' (line 51), but then the function returns without using either variable. This appears to be incomplete implementation or should return a proper response.

Copilot · 2025-12-10T22:50:43Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Common/LabelType.cs

+public enum LabelType
+{
+    Category = 1,
+    Service = 2
+}


Missing copyright and license header. For consistency with other files in the project, add the standard copyright header at the top of this file.

+1 . We do need that.

Copilot · 2025-12-10T22:50:43Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+                public static string FormatTemplate(string template, Dictionary<string, string> replacements, ILogger logger)
+        {
+            if (string.IsNullOrEmpty(template))
+                return string.Empty;
+
+            string result = template;
+
+            foreach (var replacement in replacements)
+            {
+                if (!result.Contains($"{{{replacement.Key}}}"))
+                {
+                    logger.LogWarning($"Replacement value for {replacement.Key} does not exist in {template}.");
+                }
+                result = result.Replace($"{{{replacement.Key}}}", replacement.Value);
+            }
+
+            // Replace escaped newlines with actual newlines
+            return result.Replace("\\n", "\n");
+        }


The method 'FormatTemplate' appears to be a duplicate of similar functionality in 'AzureSdkIssueLabelerService' class (line 67 references it). Consider extracting this method to a shared utility class to avoid code duplication and improve maintainability.

Copilot · 2025-12-10T22:50:43Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+                foreach (var issue in issues)
+                {
+                    if (issue.Category is null || issue.Service is null || issue.Title is null || issue.Body is null
+                    || !applicableCategoryLabels.Contains(issue.Category) || !applicableServiceLabels.Contains(issue.Service)) continue;
+
+                    await writer.WriteLineAsync(FormatIssueRecord(issue.Category, issue.Service, issue.Title, issue.Body));
+                }


This foreach loop implicitly filters its target sequence - consider filtering the sequence explicitly using '.Where(...)'.

Copilot · 2025-12-10T22:50:44Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+                    foreach (var obj in arr)
+                    {
+                        if (obj is JObject jobj)
+                            allSources.Add(jobj);
+                    }


This foreach loop implicitly filters its target sequence - consider filtering the sequence explicitly using '.Where(...)'.

Copilot · 2025-12-10T22:50:51Z

tools/issue-labeler/src/IssueLabelerService/Labelers/LabelerFactory.cs

-        private IModelHolderFactoryLite _modelHolderFactory;
        private ILogger<LabelerFactory> _logger;
-        private ILabelerLite _labeler;
+        private IModelHolderFactory _modelHolderFactory;


Field '_modelHolderFactory' can be 'readonly'.

Copilot · 2025-12-10T22:50:52Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+{
+    public class OpenAiIssueGenerator : IIssueGeneratorService
+    {
+        private RepositoryConfiguration _config;


Field '_config' can be 'readonly'.

Copilot · 2025-12-10T22:50:52Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+    public class OpenAiIssueGenerator : IIssueGeneratorService
+    {
+        private RepositoryConfiguration _config;
+        private TriageRag _ragService;


Field '_ragService' can be 'readonly'.

Copilot · 2025-12-10T22:50:52Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+    {
+        private RepositoryConfiguration _config;
+        private TriageRag _ragService;
+        private ILogger<IssueGeneratorFactory> _logger;


Field '_logger' can be 'readonly'.

Copilot · 2025-12-10T22:50:52Z

tools/issue-labeler/src/IssueLabelerService/IssueGenerator/OpenAiIssueGenerator.cs

+        private TriageRag _ragService;
+        private ILogger<IssueGeneratorFactory> _logger;
+        private readonly KnowledgeAgentRetrievalClient _retrievalClient;
+        private BlobServiceClient _blobClient;


Field '_blobClient' can be 'readonly'.

jeo02

Looks good

Wish I could have figured out GraphQL myself, but it was quite difficult to use. Do you encounter less rate limiting through GraphQL vs using the API through octokit? I imagine it should be quite an improvement.

Mostly just nits on the styling. I have nothing against top-level statements (even though the constant comments made it seem so) but since everything else is in classes I think we should keep it consistent.

Also saw a couple of classes that are declared all in one file. To find it easier it would be better to just declare them separately under Models folder.

The synthetic issues are really cool !!

jeo02 · 2026-01-07T23:26:18Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/DevOpsModelRetrainer/DevOpsModelRetrainer.cs

+using Azure.Identity;
+using Azure.Storage.Blobs;
+using Microsoft.Extensions.Configuration;


Any reason this class is all top level rather than being a class?

jeo02 · 2026-01-07T23:28:52Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Downloader/Downloader.cs

+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.


Also all top level would it not be better to have it be a class?

jeo02 · 2026-01-07T23:31:45Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/GitHubClient/GitHubApi.cs

+    /// <returns>The downloaded issues as an async enumerable collection of tuples containing the issue and its predicate-matched label (when only one matcing label is found).</returns>
+    public static async IAsyncEnumerable<(Issue Issue, string CategoryLabel, string ServiceLabel)> DownloadIssues(
+        string githubToken,
+        string org, string repo,


(nit)

Suggested change

string org, string repo,

string org,

string repo,

jeo02 · 2026-01-07T23:40:30Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/GitHubClient/GitHubApi.cs

+using GraphQL;
+using GraphQL.Client.Http;
+using GraphQL.Client.Serializer.SystemTextJson;
+using Octokit;


Suggested change

using Octokit;

Using graphql no octokit needed :)

jeo02 · 2026-01-07T23:40:52Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/GitHubClient/GitHubClient.csproj

+    <PackageReference Include="GitHubJwt" />
+    <PackageReference Include="GraphQL.Client" />
+    <PackageReference Include="GraphQL.Client.Serializer.SystemTextJson" />
+    <PackageReference Include="Octokit" />


won't need octokit here either

jeo02 · 2026-01-07T23:46:59Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Predictor/Models.cs

@@ -0,0 +1,55 @@
+// Licensed to the .NET Foundation under one or more agreements.


Class per file :) like the other comment

jeo02 · 2026-01-07T23:47:48Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Predictor/Predictor.cs

@@ -0,0 +1,193 @@
+// Licensed to the .NET Foundation under one or more agreements.


top level but seeing as so much of the code is structured by classes, I think we should keep consistent and make this a class as well. (Unless its top level for some reason I don't see)

jeo02 · 2026-01-07T23:48:36Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Tester/Tester.cs

@@ -0,0 +1,236 @@
+// Licensed to the .NET Foundation under one or more agreements.


jeo02 · 2026-01-07T23:51:19Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Tester/Tester.cs

+    return bestScore is not null ? (bestScore.Label, bestScore.Score) : ((string?)null, (float?)null);
+}
+
+class TestStats


Put this in its own file

jeo02 · 2026-01-07T23:52:25Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Trainer/Trainer.cs

@@ -0,0 +1,43 @@
+// Licensed to the .NET Foundation under one or more agreements.


jsquire · 2026-01-09T20:18:39Z

tools/issue-labeler/Directory.Build.props

    <MicrosoftNETTestSdkVersion>16.11.0</MicrosoftNETTestSdkVersion>
  </PropertyGroup>

+  <PropertyGroup>


Is this for local support of the Azure Function? I'm wondering if we should move this to a local props file that we ignore so that CI doesn't get confused.

jsquire · 2026-01-09T20:22:17Z

tools/issue-labeler/src/IssueLabeler.Shared/IModelHolderFactory.cs

+        Task<IModelHolder> CreateModelHolder(string owner, string repo, string modelType);
+        Task<IPredictor> GetPredictor(string owner, string repo, string modelType);
+    }
+    public class ModelHolderFactory : IModelHolderFactory


Please split into separate files. In general, .NET has a strong one-class-per-file norm that we'll want to stick with unless there's a type that can't stand on its own. In that case, we'd want to nest it in its parent.

jsquire · 2026-01-09T20:23:05Z

tools/issue-labeler/src/IssueLabeler.Shared/IModelHolderFactory.cs

+        private readonly ConcurrentDictionary<(string, string, string), IModelHolder> models = new ConcurrentDictionary<(string, string, string), IModelHolder>();
+        private readonly ILogger<ModelHolderFactory> logger;
+        private readonly IRepositoryConfigurationProvider configurationProvider;
+        private SemaphoreSlim sem = new SemaphoreSlim(1,1);


+1. This is a good suggestion.

jsquire · 2026-01-09T20:25:21Z

tools/issue-labeler/src/IssueLabeler.Shared/IModelHolderFactory.cs

@@ -0,0 +1,139 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+using Microsoft.Extensions.Logging;


Suggested change

using Microsoft.Extensions.Logging;

using Microsoft.Extensions.Logging;

nit: We generally throw a blank between the header and statements as a convention.

jsquire · 2026-01-09T20:31:56Z

tools/issue-labeler/src/IssueLabeler.Shared/IModelHolderFactory.cs

+    }
+    public class ModelHolderFactory : IModelHolderFactory
+    {
+        private readonly ConcurrentDictionary<(string, string, string), IModelHolder> models = new ConcurrentDictionary<(string, string, string), IModelHolder>();


Just a quick mention that if you wanted to avoid the "Look at mah Java!" feel, you can shorten up the declarations on either side. Nothing wrong with the verbose form if that's your preference.

private readonly ConcurrentDictionary<(string, string, string), IModelHolder> models = new();

private readonly var models = new ConcurrentDictionary<(string, string, string), IModelHolder>();

jsquire · 2026-01-09T21:39:13Z

tools/issue-labeler/src/IssueLabelerMLPipeline/NuGet.config

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>


We need to remove this. Microsoft has a new policy that requires us to pass through a proxy for all NuGet pulls and this resets that.

jsquire · 2026-01-09T21:58:02Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Common/DataFileUtils.cs

+    /// </summary>
+    /// <param name="text">The text to sanitize.</param>
+    /// <returns>The sanitized text.</returns>
+    public static string SanitizeText(string text)


I think we can add .AsSpan() on text and save a bunch of allocations.

jsquire · 2026-01-09T22:08:47Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Common/LabelType.cs

@@ -0,0 +1,5 @@
+public enum LabelType
+{
+    Category = 1,


Why are we explicitly numbering? Generally, you don't want to do that unless you're actually using the numeric values. We also have an issue here as default(LabelType) ends up being an invalid because it gets initialized as (LabelType)0. We'll want to add an Unknown = 0 at least here.

jsquire · 2026-01-09T22:09:13Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/Common/LabelType.cs

+public enum LabelType
+{
+    Category = 1,
+    Service = 2
+}


+1 . We do need that.

jsquire · 2026-01-09T22:11:10Z

tools/issue-labeler/src/IssueLabelerMLPipeline/src/DevOpsModelRetrainer/Args.cs

+
+public struct Args
+{
+    public string? GitHubToken { get; set; }


This looks like a file that we borrowed. We'll want to update to our header. I was going to suggest using System.CommandLine but if we inherited this and we know it works, better to not.

jsquire · 2026-01-09T22:13:05Z

GitHub is being really, really laggy today. I left some thoughts but didn't dig into the back half of the files yet.

Linh Phan and others added 21 commits November 4, 2025 15:01

make issue generator

6353aca

Create issue generator

09b62b8

clean up and change how synthetic issues are written out

999b41a

move where file write out is

416b29b

Make new models work for python SDK

b7d961a

Clean up and adding new ML pipeline

cc633eb

Merge branch 'main' of https://github.com/MaiLinhP/azure-sdk-tools

755df2d

Clean up of Legacy Labeler and fully replacing it with new ML pipeline

0297510

More clean up of unused files. Make sure new IModelHolderFactoryLite …

adc12ca

…works with repo specific Configuration

Merge branch 'Azure:main' into main

965124f

Refactoring, changing names, get rid of github actions dependencies

4733eb9

Merge branch 'main' of https://github.com/MaiLinhP/azure-sdk-tools

e60d531

Make issue generator more versatile, and upload result generated issu…

48f324d

…es to blob storage

Fix styling, redo unnecessary changes

3134d09

add EndProject on sln file

f5885d6

fix

e8955f8

Add functionally to train with synthetic data, minor fix

f2d7b76

Refactoring, giving more flexibility on uploading to blob

388bbd4

Merge branch 'Azure:main' into main

af63bb7

delete file

5157131

fix error

4e7cffc

Copilot AI review requested due to automatic review settings December 10, 2025 22:40

MaiLinhP requested review from jeo02, jsquire and radhgupta as code owners December 10, 2025 22:40

Copilot started reviewing on behalf of MaiLinhP December 10, 2025 22:41 View session

Copilot AI reviewed Dec 10, 2025

View reviewed changes

jeo02 requested changes Jan 8, 2026

View reviewed changes

jsquire reviewed Jan 9, 2026

View reviewed changes

		// Licensed to the .NET Foundation under one or more agreements.
		// The .NET Foundation licenses this file to you under the MIT license.

		@@ -0,0 +1,55 @@
		// Licensed to the .NET Foundation under one or more agreements.

		@@ -0,0 +1,193 @@
		// Licensed to the .NET Foundation under one or more agreements.

		@@ -0,0 +1,236 @@
		// Licensed to the .NET Foundation under one or more agreements.

		@@ -0,0 +1,43 @@
		// Licensed to the .NET Foundation under one or more agreements.

	using Microsoft.Extensions.Logging;

	using Microsoft.Extensions.Logging;

Revamp issue-labeler project #13310

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Revamp issue-labeler project #13310

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MaiLinhP commented Dec 10, 2025

Added an AzureSdkIssueGeneratorService Function App that will reference azure-sdk-for-net issues to generate synthetic issues for other repos and add TSV file to blob storage for model training if needed.

Replaced all old ML labeler processes with streamlined IssueLabelerMLPipeline. Most of this pipeline is meant to be run locally for more control over model training processes. It includes:

Unified config setup.

Simplified the flow from AzureSdkIssueLabelerService to Labeler.

Cleaned up codebase

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Pull request overview

Key Changes

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Added an `AzureSdkIssueGeneratorService` Function App that will reference azure-sdk-for-net issues to generate synthetic issues for other repos and add TSV file to blob storage for model training if needed.

Replaced all old ML labeler processes with streamlined `IssueLabelerMLPipeline`. Most of this pipeline is meant to be run locally for more control over model training processes. It includes:

Simplified the flow from `AzureSdkIssueLabelerService` to `Labeler`.