EngineeringOpen SourceMetrics for issues, pull requests, and discussionsWith the new Issue Metrics GitHub Action, you can now track and monitor important metrics related to issues, pull requests, and discussions, such as time to first response, time to close, and more! Data-driven insights At GitHub, we believe that data-driven insights are the keys to success for any software development project.

EnterpriseApplying GitOps principles to your operationsCould we use our Git repository as the source of truth for operational tasks, and somehow reconcile changes with our real-world view? DevOps practices have helped demonstrate the value in bringing teams together to accelerate value for end-users. This typically includes automating build and release processes and bringing quality checks directl

To perform a search, we intersect the results of multiple lookups to give us the list of documents where the string appears. With a trigram index you need four lookups: lim, imi, mit, and its in order to fulfill the query for limits. Unlike a hashmap though, these indices are too big to fit in memory, so instead, we build iterators for each index we need to access. These lazily return sorted docum

EngineeringOpen SourceInclude diagrams in your Markdown files with MermaidA picture tells a thousand words. Now you can quickly create and edit diagrams in markdown using words with Mermaid support in your Markdown files. A picture tells a thousand words, but up until now the only way to include pictures and diagrams in your Markdown files on GitHub has been to embed an image. We added support for

ProductGitHub CLI 1.0 is now availableGitHub CLI brings GitHub to your terminal. It reduces context switching, helps you focus, and enables you to more easily script and create your own workflows. Earlier this year, we… GitHub CLI brings GitHub to your terminal. It reduces context switching, helps you focus, and enables you to more easily script and create your own workflows. Earlier this year, we

ProductIntroducing GitHub Container RegistryGitHub Container Registry introduces easy sharing across organizations, fine-grained permissions, and free, anonymous access for public container images Since releasing GitHub Packages last year, hundreds of millions of packages have been downloaded from GitHub, with Docker as the second most popular ecosystem in Packages behind npm. Our users are leanin

CompanyProductnpm is joining GitHubWe're excited to announce that npm will be joining GitHub. I’m excited to announce that GitHub has signed an agreement to acquire npm. npm is a critical part of the JavaScript world. The work of the npm team over the last 10 years, and the contributions of hundreds of thousands of open source developers and maintainers, have made npm home to over 1.3 million pack

このたび、GitHub Package Registryベータプログラムをリリースしました。これは、パブリックパッケージやプライベートパッケージをソースコードとともに簡単に公開できるようにするパッケージ管理サービスです。 GitHub Package RegistryはGitHubと完全に統合されており、リポジトリ内で行う場合と同じ検索ツール、ブラウジングツール、管理ツールを使用して、パッケージの検索と公開を行えます。また、リポジトリで設定したものと同じユーザー権限やとチーム権限を使用して、コードとパッケージを一緒に管理することもできます。さらに、GitHubのグローバルCDNによって支えられた高速で信頼性の高いダウンロードが可能です。このサービスは現在のところ、JavaScript (npm)、Java (Maven)、Ruby (RubyGems)、.NET (NuGet)、Docke

EngineeringVulcanizer: a library for operating ElasticsearchVulcanizer is a Go library for interacting with an Elasticsearch cluster. Its goal is to provide a high-level API to help with common tasks associated with operating an Elasticsearch cluster such as querying health status of the cluster, migrating data off of nodes, updating cluster settings, and more. At GitHub, we use Elasticsearch as t

ProductOctober 21 Incident ReportAt 10:52 pm Sunday UTC, multiple services on GitHub.com were affected by a network partition and subsequent database failure resulting in inconsistent information being presented on our website. At 10:52 pm Sunday UTC, multiple services on GitHub.com were affected by a network partition and subsequent database failure resulting in inconsistent information being pre

EngineeringGLB: GitHub’s open source load balancerAt GitHub, we serve tens of thousands of requests every second out of our network edge, operating on GitHub's metal cloud. We've previously introduced GLB, our scalable load balancing solution… At GitHub, we serve tens of thousands of requests every second out of our network edge, operating on GitHub’s metal cloud. We’ve previously introduced GLB,

EngineeringMySQL High Availability at GitHubGitHub uses MySQL as its main datastore for all things non-git, and its availability is critical to GitHub's operation. The site itself, GitHub's API, authentication and more, all require database… GitHub uses MySQL as its main datastore for all things non-git, and its availability is critical to GitHub’s operation. The site itself, GitHub’s API, authent

ProductCustom domains on GitHub Pages gain support for HTTPSEncryption for all GitHub Pages sites Today, custom domains on GitHub Pages are gaining support for HTTPS. GitHub Pages is the best way to quickly publish beautiful websites for you and your projects. Just edit, push, and your changes are live. GitHub Pages has supported custom domains since 2009, and sites on the *.github.io domain have

EngineeringFebruary 28th DDoS Incident ReportOn Wednesday, February 28, 2018 GitHub.com was unavailable from 17:21 to 17:26 UTC and intermittently unavailable from 17:26 to 17:30 UTC due to a distributed denial-of-service (DDoS) attack. We understand… On Wednesday, February 28, 2018 GitHub.com was unavailable from 17:21 to 17:26 UTC and intermittently unavailable from 17:26 to 17:30 UTC due to a d

EngineeringKubernetes at GitHubOver the last year, GitHub has gradually evolved the infrastructure that runs the Ruby on Rails application responsible for github.com and api.github.com. We reached a big milestone recently: all web… Over the last year, GitHub has gradually evolved the infrastructure that runs the Ruby on Rails application responsible for github.com and api.github.com. We reached a

EngineeringMoving persistent data out of RedisHistorically, we have used Redis in two ways at GitHub: We used it as an LRU cache to conveniently store the results of expensive computations over data originally persisted in… Historically, we have used Redis in two ways at GitHub: We used it as an LRU cache to conveniently store the results of expensive computations over data originally persisted in

EngineeringOrchestrator at GitHubGitHub uses MySQL to store its metadata: Issues, Pull Requests, comments, organizations, notifications and so forth. While git repository data does not need MySQL to exist and persist, GitHub's service… GitHub uses MySQL to store its metadata: Issues, Pull Requests, comments, organizations, notifications and so forth. While git repository data does not need MySQL t

ProductIntroducing review requestsYou can now request a review explicitly from collaborators, making it easier to specify who you'd like to review your pull request. You can also see a list of people… You can now request a review explicitly from collaborators, making it easier to specify who you’d like to review your pull request. You can also see a list of people who you are awaiting review from

We serve a lot of diffs here at GitHub. Because it is computationally expensive to generate and display a diff, we’ve traditionally had to apply some very conservative limits on what gets loaded. We knew we could do better, and we set out to do so. Historical approach and problems Before this change, we fetched diffs by asking Git for the diff between two commit objects. We would then parse the ou

ProductChange the base branch of a Pull RequestYou can now change the base branch of an open pull request. After you’ve created a pull request, you can modify the base branch so that the changes in the… You can now change the base branch of an open pull request. After you’ve created a pull request, you can modify the base branch so that the changes in the pull request are compared against a differ