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  • ## Contributor license agreement
    
    By submitting code as an individual you agree to the
    [individual contributor license agreement](doc/legal/individual_contributor_license_agreement.md).
    By submitting code as an entity you agree to the
    [corporate contributor license agreement](doc/legal/corporate_contributor_license_agreement.md).
    
    _This notice should stay as the first item in the CONTRIBUTING.MD file._
    
    ---
    
    
    <!-- START doctoc generated TOC please keep comment here to allow auto update -->
    <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
    **Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
    
    - [Contribute to GitLab](#contribute-to-gitlab)
    
    - [Security vulnerability disclosure](#security-vulnerability-disclosure)
    - [Closing policy for issues and merge requests](#closing-policy-for-issues-and-merge-requests)
    - [Helping others](#helping-others)
    - [I want to contribute!](#i-want-to-contribute)
    
    - [Workflow labels](#workflow-labels)
      - [Type labels (~"feature proposal", ~bug, ~customer, etc.)](#type-labels-feature-proposal-bug-customer-etc)
      - [Subject labels (~wiki, ~"container registry", ~ldap, ~api, etc.)](#subject-labels-wiki-container-registry-ldap-api-etc)
    
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      - [Team labels (~CI, ~Discussion, ~Edge, ~Platform, etc.)](#team-labels-ci-discussion-edge-platform-etc)
    
      - [Priority labels (~Deliverable and ~Stretch)](#priority-labels-deliverable-and-stretch)
    
      - [Label for community contributors (~"Accepting Merge Requests")](#label-for-community-contributors-accepting-merge-requests)
    
    - [Implement design & UI elements](#implement-design--ui-elements)
    
    - [Issue tracker](#issue-tracker)
    
      - [Issue triaging](#issue-triaging)
      - [Feature proposals](#feature-proposals)
      - [Issue tracker guidelines](#issue-tracker-guidelines)
      - [Issue weight](#issue-weight)
      - [Regression issues](#regression-issues)
      - [Technical debt](#technical-debt)
      - [Stewardship](#stewardship)
    
    - [Merge requests](#merge-requests)
    
      - [Merge request guidelines](#merge-request-guidelines)
      - [Contribution acceptance criteria](#contribution-acceptance-criteria)
    
    - [Definition of done](#definition-of-done)
    - [Style guides](#style-guides)
    - [Code of conduct](#code-of-conduct)
    
    
    <!-- END doctoc generated TOC please keep comment here to allow auto update -->
    
    
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    ## Contribute to GitLab
    
    Thank you for your interest in contributing to GitLab. This guide details how
    to contribute to GitLab in a way that is efficient for everyone.
    
    GitLab comes into two flavors, GitLab Community Edition (CE) our free and open
    source edition, and GitLab Enterprise Edition (EE) which is our commercial
    edition. Throughout this guide you will see references to CE and EE for
    abbreviation.
    
    
    If you have read this guide and want to know how the GitLab [core team]
    
    operates please see [the GitLab contributing process](PROCESS.md).
    
    
    - [GitLab Inc engineers should refer to the engineering workflow document](https://about.gitlab.com/handbook/engineering/workflow/)
    
    
    ## Security vulnerability disclosure
    
    
    Please report suspected security vulnerabilities in private to
    `support@gitlab.com`, also see the
    [disclosure section on the GitLab.com website](https://about.gitlab.com/disclosure/).
    Please do **NOT** create publicly viewable issues for suspected security
    vulnerabilities.
    
    ## Closing policy for issues and merge requests
    
    GitLab is a popular open source project and the capacity to deal with issues
    and merge requests is limited. Out of respect for our volunteers, issues and
    merge requests not in line with the guidelines listed in this document may be
    closed without notice.
    
    Please treat our volunteers with courtesy and respect, it will go a long way
    towards getting your issue resolved.
    
    Issues and merge requests should be in English and contain appropriate language
    for audiences of all ages.
    
    If a contributor is no longer actively working on a submitted merge request
    we can decide that the merge request will be finished by one of our
    [Merge request coaches][team] or close the merge request. We make this decision
    based on how important the change is for our product vision. If a Merge request
    
    coach is going to finish the merge request we assign the
    
    ~"coach will finish" label.
    
    
    ## Helping others
    
    
    Please help other GitLab users when you can. The channels people will reach out
    
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    on can be found on the [getting help page][getting-help].
    
    
    Sign up for the mailing list, answer GitLab questions on StackOverflow or
    
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    respond in the IRC channel. You can also sign up on [CodeTriage][codetriage] to help with
    
    the remaining issues on the GitHub issue tracker.
    
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    ## I want to contribute!
    
    If you want to contribute to GitLab, but are not sure where to start,
    
    look for [issues with the label `Accepting Merge Requests` and weight < 5][accepting-mrs-weight].
    These issues will be of reasonable size and challenge, for anyone to start
    contributing to GitLab.
    
    To allow for asynchronous issue handling, we use [milestones][milestones-page]
    and [labels][labels-page]. Leads and product managers handle most of the
    scheduling into milestones. Labelling is a task for everyone.
    
    Most issues will have labels for at least one of the following:
    
    - Type: ~"feature proposal", ~bug, ~customer, etc.
    - Subject: ~wiki, ~"container registry", ~ldap, ~api, etc.
    - Team: ~CI, ~Discussion, ~Edge, ~Frontend, ~Platform, etc.
    - Priority: ~Deliverable, ~Stretch
    
    All labels, their meaning and priority are defined on the
    [labels page][labels-page].
    
    If you come across an issue that has none of these, and you're allowed to set
    labels, you can _always_ add the team and type, and often also the subject.
    
    [milestones-page]: https://gitlab.com/gitlab-org/gitlab-ce/milestones
    [labels-page]: https://gitlab.com/gitlab-org/gitlab-ce/labels
    
    ### Type labels (~"feature proposal", ~bug, ~customer, etc.)
    
    Type labels are very important. They define what kind of issue this is. Every
    issue should have one or more.
    
    Examples of type labels are ~"feature proposal", ~bug, ~customer, ~security,
    and ~"direction".
    
    A number of type labels have a priority assigned to them, which automatically
    makes them float to the top, depending on their importance.
    
    
    Type labels are always lowercase, and can have any color, besides blue (which is
    
    already reserved for subject labels).
    
    The descriptions on the [labels page][labels-page] explain what falls under each type label.
    
    ### Subject labels (~wiki, ~"container registry", ~ldap, ~api, etc.)
    
    Subject labels are labels that define what area or feature of GitLab this issue
    hits. They are not always necessary, but very convenient.
    
    If you are an expert in a particular area, it makes it easier to find issues to
    work on. You can also subscribe to those labels to receive an email each time an
    issue is labelled with a subject label corresponding to your expertise.
    
    Examples of subject labels are ~wiki, ~"container registry", ~ldap, ~api,
    ~issues, ~"merge requests", ~labels, and ~"container registry".
    
    
    Subject labels are always all-lowercase.
    
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    ### Team labels (~CI, ~Discussion, ~Edge, ~Platform, etc.)
    
    
    Team labels specify what team is responsible for this issue.
    Assigning a team label makes sure issues get the attention of the appropriate
    people.
    
    The current team labels are ~Build, ~CI, ~Discussion, ~Documentation, ~Edge,
    
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    ~Gitaly, ~Platform, ~Prometheus, ~Release, and ~"UX".
    
    The descriptions on the [labels page][labels-page] explain what falls under the
    responsibility of each team.
    
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    Within those team labels, we also have the ~backend and ~frontend labels to
    indicate if an issue needs backend work, frontend work, or both.
    
    
    Team labels are always capitalized so that they show up as the first label for
    any issue.
    
    ### Priority labels (~Deliverable and ~Stretch)
    
    Priority labels help us clearly communicate expectations of the work for the
    release. There are two levels of priority labels:
    
    - ~Deliverable: Issues that are expected to be delivered in the current
      milestone.
    - ~Stretch: Issues that are a stretch goal for delivering in the current
      milestone. If these issues are not done in the current release, they will
      strongly be considered for the next release.
    
    ### Label for community contributors (~"Accepting Merge Requests")
    
    Issues that are beneficial to our users, 'nice to haves', that we currently do
    not have the capacity for or want to give the priority to, are labeled as
    ~"Accepting Merge Requests", so the community can make a contribution.
    
    Community contributors can submit merge requests for any issue they want, but
    the ~"Accepting Merge Requests" label has a special meaning. It points to
    changes that:
    
    1. We already agreed on,
    1. Are well-defined,
    1. Are likely to get accepted by a maintainer.
    
    We want to avoid a situation when a contributor picks an
    ~"Accepting Merge Requests" issue and then their merge request gets closed,
    because we realize that it does not fit our vision, or we want to solve it in a
    different way.
    
    We add the ~"Accepting Merge Requests" label to:
    
    - Low priority ~bug issues (i.e. we do not add it to the bugs that we want to
    solve in the ~"Next Patch Release")
    - Small ~"feature proposal" that do not need ~UX / ~"Product work", or for which
    the ~UX / ~"Product work" is already done
    - Small ~"technical debt" issues
    
    After adding the ~"Accepting Merge Requests" label, we try to estimate the
    [weight](#issue-weight) of the issue. We use issue weight to let contributors
    know how difficult the issue is. Additionally:
    
    - We advertise [~"Accepting Merge Requests" issues with weight < 5][up-for-grabs]
      as suitable for people that have never contributed to GitLab before on the
      [Up For Grabs campaign](http://up-for-grabs.net)
    - We encourage people that have never contributed to any open source project to
      look for [~"Accepting Merge Requests" issues with a weight of 1][firt-timers]
    
    [up-for-grabs]: https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name=Accepting+Merge+Requests&scope=all&sort=weight_asc&state=opened
    [firt-timers]: https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name%5B%5D=Accepting+Merge+Requests&scope=all&sort=upvotes_desc&state=opened&weight=1
    
    ## Implement design & UI elements
    
    Please see the [UX Guide for GitLab].
    
    To get support for your particular problem please use the
    [getting help channels](https://about.gitlab.com/getting-help/).
    
    The [GitLab CE issue tracker on GitLab.com][ce-tracker] is for bugs concerning
    the latest GitLab release and [feature proposals](#feature-proposals).
    
    When submitting an issue please conform to the issue submission guidelines
    listed below. Not all issues will be addressed and your issue is more likely to
    be addressed if you submit a merge request which partially or fully solves
    the issue.
    
    If you're unsure where to post, post to the [mailing list][google-group] or
    [Stack Overflow][stackoverflow] first. There are a lot of helpful GitLab users
    there who may be able to help you quickly. If your particular issue turns out
    to be a bug, it will find its way from there.
    
    If it happens that you know the solution to an existing bug, please first
    open the issue in order to keep track of it and then open the relevant merge
    request that potentially fixes it.
    
    ### Issue triaging
    
    Our issue triage policies are [described in our handbook]. You are very welcome
    to help the GitLab team triage issues. We also organize [issue bash events] once
    every quarter.
    
    The most important thing is making sure valid issues receive feedback from the
    development team. Therefore the priority is mentioning developers that can help
    
    on those issues. Please select someone with relevant experience from the
    [GitLab team][team]. If there is nobody mentioned with that expertise look in
    the commit history for the affected files to find someone.
    
    
    [described in our handbook]: https://about.gitlab.com/handbook/engineering/issues/issue-triage-policies/
    [issue bash events]: https://gitlab.com/gitlab-org/gitlab-ce/issues/17815
    
    
    To create a feature proposal for CE, open an issue on the
    
    [issue tracker of CE][ce-tracker].
    
    For feature proposals for EE, open an issue on the
    [issue tracker of EE][ee-tracker].
    
    In order to help track the feature proposals, we have created a
    [`feature proposal`][fpl] label. For the time being, users that are not members
    
    of the project cannot add labels. You can instead ask one of the [core team]
    
    members to add the label `feature proposal` to the issue or add the following
    code snippet right after your description in a new line: `~"feature proposal"`.
    
    Please keep feature proposals as small and simple as possible, complex ones
    might be edited to make them small and simple.
    
    Please submit Feature Proposals using the ['Feature Proposal' issue template](.gitlab/issue_templates/Feature Proposal.md) provided on the issue tracker.
    
    For changes in the interface, it can be helpful to create a mockup first.
    If you want to create something yourself, consider opening an issue first to
    discuss whether it is interesting to include this in GitLab.
    
    **[Search the issue tracker][ce-tracker]** for similar entries before
    submitting your own, there's a good chance somebody else had the same issue or
    feature proposal. Show your support with an award emoji and/or join the
    discussion.
    
    
    Please submit bugs using the ['Bug' issue template](.gitlab/issue_templates/Bug.md) provided on the issue tracker.
    
    The text in the parenthesis is there to help you with what to include. Omit it
    when submitting the actual issue. You can copy-paste it and then edit as you
    see fit.
    
    
    ### Issue weight
    
    Issue weight allows us to get an idea of the amount of work required to solve
    one or multiple issues. This makes it possible to schedule work more accurately.
    
    You are encouraged to set the weight of any issue. Following the guidelines
    below will make it easy to manage this, without unnecessary overhead.
    
    1. Set weight for any issue at the earliest possible convenience
    1. If you don't agree with a set weight, discuss with other developers until
    consensus is reached about the weight
    1. Issue weights are an abstract measurement of complexity of the issue. Do not
    relate issue weight directly to time. This is called [anchoring](https://en.wikipedia.org/wiki/Anchoring)
    and something you want to avoid.
    1. Something that has a weight of 1 (or no weight) is really small and simple.
    Something that is 9 is rewriting a large fundamental part of GitLab,
    which might lead to many hard problems to solve. Changing some text in GitLab
    is probably 1, adding a new Git Hook maybe 4 or 5, big features 7-9.
    1. If something is very large, it should probably be split up in multiple
    issues or chunks. You can simply not set the weight of a parent issue and set
    weights to children issues.
    
    
    ### Regression issues
    
    Every monthly release has a corresponding issue on the CE issue tracker to keep
    track of functionality broken by that release and any fixes that need to be
    included in a patch release (see [8.3 Regressions] as an example).
    
    As outlined in the issue description, the intended workflow is to post one note
    with a reference to an issue describing the regression, and then to update that
    note with a reference to the merge request that fixes it as it becomes available.
    
    If you're a contributor who doesn't have the required permissions to update
    other users' notes, please post a new note with a reference to both the issue
    and the merge request.
    
    The release manager will [update the notes] in the regression issue as fixes are
    addressed.
    
    [8.3 Regressions]: https://gitlab.com/gitlab-org/gitlab-ce/issues/4127
    [update the notes]: https://gitlab.com/gitlab-org/release-tools/blob/master/doc/pro-tips.md#update-the-regression-issue
    
    
    In order to track things that can be improved in GitLab's codebase, we created
    
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    the ~"technical debt" label in [GitLab's issue tracker][ce-tracker].
    
    
    This label should be added to issues that describe things that can be improved,
    
    shortcuts that have been taken, code that needs refactoring, features that need
    
    additional attention, and all other things that have been left behind due to
    high velocity of development.
    
    
    Everyone can create an issue, though you may need to ask for adding a specific
    label, if you do not have permissions to do it by yourself. Additional labels
    
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    can be combined with the `technical debt` label, to make it easier to schedule
    
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    Issues tagged with the `technical debt` label have the same priority like issues
    
    that describe a new feature to be introduced in GitLab, and should be scheduled
    for a release by the appropriate person.
    
    
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    Make sure to mention the merge request that the `technical debt` issue is
    
    associated with in the description of the issue.
    
    ### Stewardship
    
    For issues related to the open source stewardship of GitLab,
    there is the ~"stewardship" label.
    
    This label is to be used for issues in which the stewardship of GitLab
    is a topic of discussion. For instance if GitLab Inc. is planning to remove
    features from GitLab CE to make exclusive in GitLab EE, related issues
    would be labelled with ~"stewardship".
    
    A recent example of this was the issue for
    [bringing the time tracking API to GitLab CE][time-tracking-issue].
    
    [time-tracking-issue]: https://gitlab.com/gitlab-org/gitlab-ce/issues/25517#note_20019084
    
    
    ## Merge requests
    
    We welcome merge requests with fixes and improvements to GitLab code, tests,
    
    and/or documentation. The issues that are specifically suitable for
    community contributions are listed with the label
    [`Accepting Merge Requests` on our issue tracker for CE][accepting-mrs-ce]
    and [EE][accepting-mrs-ee], but you are free to contribute to any other issue
    you want.
    
    Please note that if an issue is marked for the current milestone either before
    or while you are working on it, a team member may take over the merge request
    in order to ensure the work is finished before the release date.
    
    If you want to add a new feature that is not labeled it is best to first create
    a feedback issue (if there isn't one already) and leave a comment asking for it
    
    to be marked as `Accepting Merge Requests`. Please include screenshots or
    
    wireframes if the feature will also change the UI.
    
    Merge requests should be opened at [GitLab.com][gitlab-mr-tracker].
    
    If you are new to GitLab development (or web development in general), see the
    [I want to contribute!](#i-want-to-contribute) section to get you started with
    some potentially easy issues.
    
    To start with GitLab development download the [GitLab Development Kit][gdk] and
    see the [Development section](doc/development/README.md) for some guidelines.
    
    ### Merge request guidelines
    
    If you can, please submit a merge request with the fix or improvements
    including tests. If you don't know how to fix the issue but can write a test
    that exposes the issue we will accept that as well. In general bug fixes that
    include a regression test are merged quickly while new features without proper
    tests are least likely to receive timely feedback. The workflow to make a merge
    request is as follows:
    
    1. Fork the project into your personal space on GitLab.com
    
    1. Create a feature branch, branch away from `master`
    
    1. Write [tests](https://gitlab.com/gitlab-org/gitlab-development-kit#running-the-tests) and code
    
    1. [Generate a changelog entry with `bin/changelog`][changelog]
    
    1. If you are writing documentation, make sure to follow the
       [documentation styleguide][doc-styleguide]
    
    1. If you have multiple commits please combine them into a few logically
      organized commits by [squashing them][git-squash]
    
    1. Push the commit(s) to your fork
    
    1. Submit a merge request (MR) to the `master` branch
    
      1. Your merge request needs at least 1 approval but feel free to require more.
        For instance if you're touching backend and frontend code, it's a good idea
        to require 2 approvals: 1 from a backend maintainer and 1 from a frontend
        maintainer
      1. You don't have to select any approvers, but you can if you really want
        specific people to approve your merge request
    
    1. The MR title should describe the change you want to make
    
    1. The MR description should give a motive for your change and the method you
    
       used to achieve it.
      1. If you are contributing code, fill in the template already provided in the
         "Description" field.
      1. If you are contributing documentation, choose `Documentation` from the
         "Choose a template" menu and fill in the template.
    
      1. Mention the issue(s) your merge request solves, using the `Solves #XXX` or
        `Closes #XXX` syntax to auto-close the issue(s) once the merge request will
        be merged.
    1. If you're allowed to, set a relevant milestone and labels
    
    1. If the MR changes the UI it should include *Before* and *After* screenshots
    
    1. If the MR changes CSS classes please include the list of affected pages,
    
       `grep css-class ./app -R`
    1. Be prepared to answer questions and incorporate feedback even if requests
       for this arrive weeks or months after your MR submission
    
      1. If a discussion has been addressed, select the "Resolve discussion" button
        beneath it to mark it resolved.
    
    1. If your MR touches code that executes shell commands, reads or opens files or
       handles paths to files on disk, make sure it adheres to the
       [shell command guidelines](doc/development/shell_commands.md)
    1. If your code creates new files on disk please read the
       [shared files guidelines](doc/development/shared_files.md).
    
    1. When writing commit messages please follow
       [these](http://tbaggery.com/2008/04/19/a-note-about-git-commit-messages.html)
       [guidelines](http://chris.beams.io/posts/git-commit/).
    
    1. If your merge request adds one or more migrations, make sure to execute all
       migrations on a fresh database before the MR is reviewed. If the review leads
       to large changes in the MR, do this again once the review is complete.
    1. For more complex migrations, write tests.
    
    1. Merge requests **must** adhere to the [merge request performance
       guidelines](doc/development/merge_request_performance_guidelines.md).
    
    1. For tests that use Capybara or PhantomJS, see this [article on how
       to write reliable asynchronous tests](https://robots.thoughtbot.com/write-reliable-asynchronous-integration-tests-with-capybara).
    
    
    Please keep the change in a single MR **as small as possible**. If you want to
    contribute a large feature think very hard what the minimum viable change is.
    Can you split the functionality? Can you only submit the backend/API code? Can
    you start with a very simple UI? Can you do part of the refactor? The increased
    reviewability of small MRs that leads to higher code quality is more important
    to us than having a minimal commit log. The smaller an MR is the more likely it
    is it will be merged (quickly). After that you can send more MRs to enhance it.
    
    The ['How to get faster PR reviews' document of Kubernetes](https://github.com/kubernetes/community/blob/master/contributors/devel/faster_reviews.md) also has some great points regarding this.
    
    
    For examples of feedback on merge requests please look at already
    
    [closed merge requests][closed-merge-requests]. If you would like quick feedback
    
    on your merge request feel free to mention someone from the [core team] or one
    of the [Merge request coaches][team].
    
    Please ensure that your merge request meets the contribution acceptance criteria.
    
    When having your code reviewed and when reviewing merge requests please take the
    
    [code review guidelines](doc/development/code_review.md) into account.
    
    
    ### Contribution acceptance criteria
    
    1. The change is as small as possible
    1. Include proper tests and make all tests pass (unless it contains a test
    
       exposing a bug in existing code). Every new class should have corresponding
       unit tests, even if the class is exercised at a higher level, such as a feature test.
    
    1. If you suspect a failing CI build is unrelated to your contribution, you may
       try and restart the failing CI job or ask a developer to fix the
       aforementioned failing test
    1. Your MR initially contains a single commit (please use `git rebase -i` to
       squash commits)
    
    1. Your changes can merge without problems (if not please rebase if you're the
       only one working on your feature branch, otherwise, merge `master`)
    
    1. Does not break any existing functionality
    1. Fixes one specific issue or implements one specific feature (do not combine
       things, send separate merge requests if needed)
    1. Migrations should do only one thing (e.g., either create a table, move data
       to a new table or remove an old table) to aid retrying on failure
    1. Keeps the GitLab code base clean and well structured
    1. Contains functionality we think other users will benefit from too
    
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    1. Doesn't add configuration options or settings options since they complicate
       making and testing future changes
    
    1. Changes do not adversely degrade performance.
       - Avoid repeated polling of endpoints that require a significant amount of overhead
       - Check for N+1 queries via the SQL log or [`QueryRecorder`](https://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
       - Avoid repeated access of filesystem
    
    1. If you need polling to support real-time features, please use
       [polling with ETag caching][polling-etag].
    
    1. Changes after submitting the merge request should be in separate commits
    
    1. It conforms to the [style guides](#style-guides) and the following:
        - If your change touches a line that does not follow the style, modify the
          entire line to follow it. This prevents linting tools from generating warnings.
        - Don't touch neighbouring lines. As an exception, automatic mass
          refactoring modifications may leave style non-compliant.
    
    1. If the merge request adds any new libraries (gems, JavaScript libraries,
       etc.), they should conform to our [Licensing guidelines][license-finder-doc].
       See the instructions in that document for help if your MR fails the
       "license-finder" test with a "Dependencies that need approval" error.
    
    ## Definition of done
    
    
    If you contribute to GitLab please know that changes involve more than just
    
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    code. We have the following [definition of done][definition-of-done]. Please ensure you support
    
    the feature you contribute through all of these steps.
    
    1. Description explaining the relevancy (see following item)
    
    1. Working and clean code that is commented where needed
    
    1. [Unit and system tests][testing] that pass on the CI server
    
    1. Performance/scalability implications have been considered, addressed, and tested
    
    1. [Documented][doc-styleguide] in the `/doc` directory
    
    1. [Changelog entry added][changelog], if necessary
    
    1. Reviewed and any concerns are addressed
    
    1. Merged by a project maintainer
    
    1. Added to the release blog article, if relevant
    1. Added to [the website](https://gitlab.com/gitlab-com/www-gitlab-com/), if relevant
    
    1. Community questions answered
    
    1. Answers to questions radiated (in docs/wiki/support etc.)
    
    If you add a dependency in GitLab (such as an operating system package) please
    consider updating the following and note the applicability of each in your
    merge request:
    
    
    1. Note the addition in the release blog post (create one if it doesn't exist yet) https://gitlab.com/gitlab-com/www-gitlab-com/merge_requests/
    1. Upgrade guide, for example https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/update/7.5-to-7.6.md
    1. Upgrader https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/update/upgrader.md#2-run-gitlab-upgrade-tool
    1. Installation guide https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/install/installation.md#1-packages-dependencies
    1. GitLab Development Kit https://gitlab.com/gitlab-org/gitlab-development-kit
    
    1. Test suite https://gitlab.com/gitlab-org/gitlab-ce/blob/master/scripts/prepare_build.sh
    
    1. Omnibus package creator https://gitlab.com/gitlab-org/omnibus-gitlab
    
    
    ## Style guides
    
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    1.  [Ruby](https://github.com/bbatsov/ruby-style-guide).
    
        Important sections include [Source Code Layout][rss-source] and
        [Naming][rss-naming]. Use:
    
        - multi-line method chaining style **Option A**: dot `.` on the second line
    
        - string literal quoting style **Option A**: single quoted by default
    1.  [Rails](https://github.com/bbatsov/rails-style-guide)
    
    1.  [Newlines styleguide][newlines-styleguide]
    
    1.  [JavaScript styleguide][js-styleguide]
    
    1.  [SCSS styleguide][scss-styleguide]
    
    1.  [Shell commands](doc/development/shell_commands.md) created by GitLab
        contributors to enhance security
    
    1.  [Database Migrations](doc/development/migration_style_guide.md)
    
    1.  [Markdown](http://www.cirosantilli.com/markdown-styleguide)
    
    1.  [Documentation styleguide][doc-styleguide]
    
    1.  Interface text should be written subjectively instead of objectively. It
        should be the GitLab core team addressing a person. It should be written in
        present time and never use past tense (has been/was). For example instead
        of _prohibited this user from being saved due to the following errors:_ the
        text should be _sorry, we could not create your account because:_
    
    This is also the style used by linting tools such as
    [RuboCop](https://github.com/bbatsov/rubocop),
    [PullReview](https://www.pullreview.com/) and [Hound CI](https://houndci.com).
    
    
    ## Code of conduct
    
    As contributors and maintainers of this project, we pledge to respect all
    people who contribute through reporting issues, posting feature requests,
    updating documentation, submitting pull requests or patches, and other
    activities.
    
    We are committed to making participation in this project a harassment-free
    experience for everyone, regardless of level of experience, gender, gender
    identity and expression, sexual orientation, disability, personal appearance,
    body size, race, ethnicity, age, or religion.
    
    Examples of unacceptable behavior by participants include the use of sexual
    language or imagery, derogatory comments or personal attacks, trolling, public
    or private harassment, insults, or other unprofessional conduct.
    
    Project maintainers have the right and responsibility to remove, edit, or
    reject comments, commits, code, wiki edits, issues, and other contributions
    that are not aligned to this Code of Conduct. Project maintainers who do not
    follow the Code of Conduct may be removed from the project team.
    
    This code of conduct applies both within project spaces and in public spaces
    when an individual is representing the project or its community.
    
    Instances of abusive, harassing, or otherwise unacceptable behavior can be
    
    reported by emailing `contact@gitlab.com`.
    
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    This Code of Conduct is adapted from the [Contributor Covenant][contributor-covenant], version 1.1.0,
    
    available at [http://contributor-covenant.org/version/1/1/0/](http://contributor-covenant.org/version/1/1/0/).
    
    
    [core team]: https://about.gitlab.com/core-team/
    
    [team]: https://about.gitlab.com/team/
    
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    [getting-help]: https://about.gitlab.com/getting-help/
    [codetriage]: http://www.codetriage.com/gitlabhq/gitlabhq
    
    [accepting-mrs-weight]: https://gitlab.com/gitlab-org/gitlab-ce/issues?assignee_id=0&label_name[]=Accepting%20Merge%20Requests&sort=weight_asc
    
    [ce-tracker]: https://gitlab.com/gitlab-org/gitlab-ce/issues
    [ee-tracker]: https://gitlab.com/gitlab-org/gitlab-ee/issues
    [google-group]: https://groups.google.com/forum/#!forum/gitlabhq
    [stackoverflow]: https://stackoverflow.com/questions/tagged/gitlab
    [fpl]: https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name=feature+proposal
    [accepting-mrs-ce]: https://gitlab.com/gitlab-org/gitlab-ce/issues?label_name=Accepting+Merge+Requests
    [accepting-mrs-ee]: https://gitlab.com/gitlab-org/gitlab-ee/issues?label_name=Accepting+Merge+Requests
    [gitlab-mr-tracker]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests
    [gdk]: https://gitlab.com/gitlab-org/gitlab-development-kit
    [git-squash]: https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits
    
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    [closed-merge-requests]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests?assignee_id=&label_name=&milestone_id=&scope=&sort=&state=closed
    [definition-of-done]: http://guide.agilealliance.org/guide/definition-of-done.html
    [contributor-covenant]: http://contributor-covenant.org
    
    [rss-source]: https://github.com/bbatsov/ruby-style-guide/blob/master/README.md#source-code-layout
    [rss-naming]: https://github.com/bbatsov/ruby-style-guide/blob/master/README.md#naming
    
    [changelog]: doc/development/changelog.md "Generate a changelog entry"
    
    [doc-styleguide]: doc/development/doc_styleguide.md "Documentation styleguide"
    
    [js-styleguide]: doc/development/fe_guide/style_guide_js.md "JavaScript styleguide"
    [scss-styleguide]: doc/development/fe_guide/style_guide_scss.md "SCSS styleguide"
    
    [newlines-styleguide]: doc/development/newlines_styleguide.md "Newlines styleguide"
    
    [UX Guide for GitLab]: http://docs.gitlab.com/ce/development/ux_guide/
    
    [license-finder-doc]: doc/development/licensing.md
    
    [GitLab Inc engineering workflow]: https://about.gitlab.com/handbook/engineering/workflow/#labelling-issues
    
    [polling-etag]: https://docs.gitlab.com/ce/development/polling.html
    
    [testing]: doc/development/testing.md
    
    [^1]: Please note that specs other than JavaScript specs are considered backend
          code.