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Mihail Stoykov

PROFILE

Mihail Stoykov

M. Stoikov contributed to the grafana/k6 repository by engineering robust backend and browser automation features, focusing on reliability, maintainability, and developer experience. Over 13 months, Stoikov delivered 63 features and resolved 29 bugs, modernizing asynchronous workflows, stabilizing CI pipelines, and enhancing secrets management. Using Go, JavaScript, and Protocol Buffers, Stoikov refactored core modules for safer concurrency, improved test infrastructure, and streamlined dependency management. Their work included upgrading Chrome DevTools Protocol integration, hardening TLS security, and unifying error handling across modules. These efforts resulted in more predictable releases, reduced runtime errors, and a codebase that supports rapid, secure development cycles.

Overall Statistics

Feature vs Bugs

68%Features

Repository Contributions

182Total
Bugs
29
Commits
182
Features
63
Lines of code
273,166
Activity Months13

Work History

October 2025

2 Commits • 1 Features

Oct 1, 2025

October 2025: Grafana/k6 delivered two key improvements enhancing operations reliability and developer tooling compatibility. 1) Automated Issue Assignment Workflow Enhancement — broadened the assignee pool by adding AgnesToulet to the auto-assign workflow, improving workload distribution and issue response times. 2) CDProto Upgrade and Frame Navigation Fix — upgraded the Chrome DevTools Protocol integration by updating cdproto and adjusting frame navigation logic to align with the new action.Do return signature, with accompanying vendor updates. These changes reduce manual triage, improve CI feedback, and ensure compatibility with evolving developer tooling.

September 2025

5 Commits • 1 Features

Sep 1, 2025

This monthly summary highlights the key deliverables, quality improvements, and impact for the Grafana/k6 repo in September 2025, with a focus on business value and technical excellence.

August 2025

18 Commits • 6 Features

Aug 1, 2025

August 2025 performance-focused month across grafana/k6 and grafana/k6-docs. Key outcomes include stabilizing CI/test execution on Windows/ARM, standardizing nullish validation across core modules, and delivering release/versioning and docs improvements for the v1.2.x/v1.3.0 cycle. Packaging tooling was enhanced for improved build reliability, and documentation for v1.2.x and Net-GRPC authority parameters was expanded to help users. These efforts drove more reliable CI, safer releases, and clearer guidance for developers and users.

July 2025

17 Commits • 4 Features

Jul 1, 2025

July 2025 monthly performance summary for grafana/k6. The work focused on reliability, security, and developer velocity across the repository, delivering concrete features, hardening, and process improvements that translate to safer deployments, lower run-time risk, and faster shipping cycles.

June 2025

8 Commits • 2 Features

Jun 1, 2025

June 2025 monthly summary for grafana/k6: Focused on stabilizing automated browser tests, cleaning test infrastructure, and hardening CI. Delivered reliability and maintainability improvements while preserving compatibility through dependency stabilization and CI privacy controls. Notable outcomes include stabilizing flaky tests, modernizing browser tests, and mitigating CI noise through targeted disables.

May 2025

7 Commits • 2 Features

May 1, 2025

May 2025 monthly summary for grafana/k6: Delivered enhancements to code quality tooling and browser module stability, with a focus on reliability, performance, and maintainability. Key features delivered: - Code Quality and CI Tooling Enhancements: Updated golangci-lint configuration and upgraded the lint actions CI pipeline, enabling autofixes and stricter checks. Commits include f3089d533d195c44389dc42d00983b0ac4a27b3c (golangci-lint: Add copyloopvar + autofix + manual fixes) and a0fbc6401e36c524042a11b321a168f45c997bf4 (chore: bump golangci-lint-action in reusable GHA). - K6 Browser Module Stability, JSON Handling, and Performance Upgrades: Addresses multiple browser module issues—reliable tab/window creation, robust JSON unmarshalling, default handling for states and fill values, safer object stringification for concurrency, and updated cdproto dependencies/go-json-experiment integration for performance and maintainability. Commits include 1331d493131fdc243202d8d0ce70788820df823c, a9f5ab9270cc1a890685c30c9461eb771903da95, 0398c1f0fe9dd9e2535f706afac45514fe638bc2, c68e4f815fc6d2394e23bea48e03b68039cef7d3, and 23e50f3b5a1fc6249825c19185038e4f861d8ae5. Major bugs fixed: - Fixed "Failed to open new tab - no browser is open (-32000)" error observed in the K6 browser module. - Resolved undefined states when empty and nil value handling in fill logic. - Addressed race conditions arising from stringifying types, improving concurrency safety. Overall impact and accomplishments: - Significantly increased browser module stability and reliability for end-to-end test workloads. - Reduced CI drag and maintenance overhead through automated lint autofixes and up-to-date tooling. - Accelerated delivery cycles with more predictable builds and fewer flaky tests. Technologies/skills demonstrated: - Go tooling and CI automation (golangci-lint, golangci-lint-action), performance-oriented dependency upgrades (cdproto, go-json-experiment). - JSON handling, robust error handling, and concurrency-safe patterns. - Cross-cutting improvements to testability, reliability, and maintainability across critical components.

April 2025

23 Commits • 13 Features

Apr 1, 2025

April 2025 focused on reliability, security, and maintainability in grafana/k6, delivering features and fixes that reduce test flakiness, harden data handling, and set the stage for v1.0.0. The work enhanced test isolation, internalized critical components, and improved CI stability, enabling faster, safer iterations and smoother future releases.

March 2025

17 Commits • 3 Features

Mar 1, 2025

March 2025 monthly summary for grafana/k6: Focused on strengthening security features, stabilizing export flows, and elevating build quality. Delivered robust secrets management improvements, including error handling enhancements and a refactored secretsource API with reliable mocks; modernized CI/CD and Go toolchains to improve reliability; expanded Sobek export capabilities; and fixed critical export correctness and race-condition issues. These efforts reduced runtime errors, improved maintainability, and enhanced deployability across environments.

February 2025

30 Commits • 11 Features

Feb 1, 2025

February 2025 highlights: Strengthened cross-platform reliability, improved CI stability, and expanded extensibility for k6 and k6-docs. Key work spanned feature delivery, targeted bug fixes, and foundational improvements that drive business value in reliability, developer experience, and security. Key outcomes: - Delivered new file:// scheme support in open and experimental filesystem paths, enabling seamless local file access during tests and in user workflows. - Enabled TypeScript by default in k6 docs, reducing setup friction for TS users and aligning with modern JS/TS workflows; added documentation directive to skip code blocks for precise content rendering. - Significantly improved reliability and stability across browser-related tests and sessions by addressing race conditions in evaluation, mappings, page/frame interactions, and CI environments; included targeted fixes and CI stability work. - Implemented race-detection for Web Platform Tests, surfacing data-race issues earlier and improving overall test confidence. - Reorganized and hardened secret management by moving to k6/secrets, enabling async get and reducing coupling; added parsing improvements, integration tests, and examples to accelerate secure usage. - Expanded CLI and runtime capabilities with: allowing commas in tag values via CLI flag, and refactoring timer/global exposure for global APIs, improving consistency and usability. - Subsystem hardening across maintenance and platform support: removing non-actionable TODOs, fixing Windows-specific TestOpen, and reducing flakiness in TestConstantArrivalRateRunCorrectRate. - Documentation and tooling improvements for CI/usability, including lighter MacOS throttle example to pass in CI and updated docs renames.

January 2025

20 Commits • 9 Features

Jan 1, 2025

Concise monthly summary for grafana/k6, January 2025. Focused on delivering features and reliability improvements that enhance security, maintainability, and performance while reducing CI/CD load and ensuring robust runtime behavior.

December 2024

22 Commits • 5 Features

Dec 1, 2024

December 2024 monthly summary for Grafana’s browser-related projects (xk6-browser and k6). Focused on delivering core browser integration improvements, strengthening CI reliability, and stabilizing cross-platform build and packaging workflows. Key work spanned Go linting and lint tooling, browser module consolidation, Windows CI stabilization, code quality enhancements, and packaging reliability. The work delivered concrete, business-value improvements in code quality, test reliability, and faster shipping of browser features.

November 2024

7 Commits • 3 Features

Nov 1, 2024

November 2024 monthly summary focusing on key accomplishments across grafana/k6-docs, grafana/k6, and grafana/xk6-browser. This period delivered targeted feature work and major maintenance fixes that improve usability, performance, and developer efficiency. Highlights include documentation modernization for tracing, modernization of examples with Top-Level Await, dependency cleanup to simplify builds, and code-quality improvements across the codebase. These efforts reduce onboarding time, minimize build risks, and strengthen alignment with modern JS/Go toolchains.

October 2024

6 Commits • 3 Features

Oct 1, 2024

October 2024 monthly summary focused on stabilizing asynchronous workflows, improving user experience, and tightening dependency workflows across grafana/k6 and grafana/xk6-browser. Delivered key features to modernize UI branding, optimize dependency management, and simplify promise/async handling in the browser extension. Fixed critical bugs affecting interrupt handling and Blob API error resilience, reducing runtime panics and reliability issues. These efforts improved the reliability of k6-based testing workflows, reduced build blockers, and accelerated PR cycles, enabling faster, safer releases for customers. Technologies demonstrated include Sobek dependency updates, enhanced color library, branding asset updates, dependency management improvements, and advanced promise patterns for async operations.

Activity

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Quality Metrics

Correctness89.8%
Maintainability91.2%
Architecture85.6%
Performance84.0%
AI Usage21.0%

Skills & Technologies

Programming Languages

BashDockerfileGoJavaScriptMarkdownProtoProtocol BuffersShellTypeScriptXML

Technical Skills

API DesignAPI DevelopmentAPI DocumentationAPI RefactoringAsynchronous ProgrammingBackend DevelopmentBash ScriptingBrowser AutomationBrowser TestingBug FixBug FixingBuild AutomationBuild EngineeringBuild Process ManagementBuild System

Repositories Contributed To

3 repos

Overview of all repositories you've contributed to across your timeline

grafana/k6

Oct 2024 Oct 2025
13 Months active

Languages Used

GoYAMLJavaScriptBashMarkdownShellProtoXML

Technical Skills

API DevelopmentAsynchronous ProgrammingCI/CDCLIDependency ManagementDevOps

grafana/xk6-browser

Oct 2024 Dec 2024
3 Months active

Languages Used

GoYAML

Technical Skills

Asynchronous ProgrammingPromise HandlingRefactoringCode FormattingCode LintingConfiguration Management

grafana/k6-docs

Nov 2024 Aug 2025
3 Months active

Languages Used

MarkdownJavaScript

Technical Skills

DocumentationTechnical WritingContent Management

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