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class="vector-menu-content-list"> <li id="ca-uls" class="mw-list-item active user-links-collapsible-item"><a data-mw="interface" href="#" class="uls-trigger cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet"><span class="vector-icon mw-ui-icon-wikimedia-language mw-ui-icon-wikimedia-wikimedia-language"></span> <span>English</span></a> </li> </ul> </div> </div> <div id="p-vector-user-menu-userpage" class="vector-menu mw-portlet emptyPortlet" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> </ul> </div> </div> <nav class="vector-appearance-landmark" aria-label="Appearance"> <div id="vector-appearance-dropdown" class="vector-dropdown " title="Change the appearance of the page's font size, width, and color" > <input type="checkbox" id="vector-appearance-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-appearance-dropdown" class="vector-dropdown-checkbox " aria-label="Appearance" > 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data-mw="interface" href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=www.mediawiki.org&uselang=en" class=""><span>Donate</span></a> </li> <li id="pt-createaccount-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:CreateAccount&returnto=Wikimedia+services+policy" title="You are encouraged to create an account and log in; however, it is not mandatory" class=""><span>Create account</span></a> </li> <li id="pt-login-2" class="user-links-collapsible-item mw-list-item user-links-collapsible-item"><a data-mw="interface" href="/w/index.php?title=Special:UserLogin&returnto=Wikimedia+services+policy" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o" class=""><span>Log in</span></a> </li> </ul> </div> </div> </div> <div id="vector-user-links-dropdown" class="vector-dropdown vector-user-menu vector-button-flush-right vector-user-menu-logged-out" title="More options" > <input type="checkbox" id="vector-user-links-dropdown-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-user-links-dropdown" class="vector-dropdown-checkbox " aria-label="Personal tools" > <label id="vector-user-links-dropdown-label" for="vector-user-links-dropdown-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-ellipsis mw-ui-icon-wikimedia-ellipsis"></span> <span class="vector-dropdown-label-text">Personal tools</span> </label> <div class="vector-dropdown-content"> <div id="p-personal" class="vector-menu mw-portlet mw-portlet-personal user-links-collapsible-item" title="User menu" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-sitesupport" class="user-links-collapsible-item mw-list-item"><a href="https://donate.wikimedia.org/?wmf_source=donate&wmf_medium=sidebar&wmf_campaign=www.mediawiki.org&uselang=en"><span>Donate</span></a></li><li id="pt-createaccount" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:CreateAccount&returnto=Wikimedia+services+policy" title="You are encouraged to create an account and log in; however, it is not mandatory"><span class="vector-icon mw-ui-icon-userAdd mw-ui-icon-wikimedia-userAdd"></span> <span>Create account</span></a></li><li id="pt-login" class="user-links-collapsible-item mw-list-item"><a href="/w/index.php?title=Special:UserLogin&returnto=Wikimedia+services+policy" title="You are encouraged to log in; however, it is not mandatory [o]" accesskey="o"><span class="vector-icon mw-ui-icon-logIn mw-ui-icon-wikimedia-logIn"></span> <span>Log in</span></a></li> </ul> </div> </div> <div id="p-user-menu-anon-editor" class="vector-menu mw-portlet mw-portlet-user-menu-anon-editor" > <div class="vector-menu-heading"> Pages for logged out editors <a href="/wiki/Help:Introduction" aria-label="Learn more about editing"><span>learn more</span></a> </div> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="pt-anoncontribs" class="mw-list-item"><a href="/wiki/Special:MyContributions" title="A list of edits made from this IP address [y]" accesskey="y"><span>Contributions</span></a></li><li id="pt-anontalk" class="mw-list-item"><a href="/wiki/Special:MyTalk" title="Discussion about edits from this IP address [n]" accesskey="n"><span>Talk</span></a></li> </ul> </div> </div> </div> </div> </nav> </div> </header> </div> <div class="mw-page-container"> <div class="mw-page-container-inner"> <div class="vector-sitenotice-container"> <div id="siteNotice"></div> </div> <div class="vector-column-start"> <div class="vector-main-menu-container"> <div id="mw-navigation"> <nav id="mw-panel" class="vector-main-menu-landmark" aria-label="Site"> <div 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id="mw-panel-toc-list"> <li id="toc-mw-content-text" class="vector-toc-list-item vector-toc-level-1"> <a href="#" class="vector-toc-link"> <div class="vector-toc-text">Beginning</div> </a> </li> <li id="toc-Development_policies" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Development_policies"> <div class="vector-toc-text"> <span class="vector-toc-numb">1</span> <span>Development policies</span> </div> </a> <ul id="toc-Development_policies-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Security_and_privacy" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Security_and_privacy"> <div class="vector-toc-text"> <span class="vector-toc-numb">2</span> <span>Security and privacy</span> </div> </a> <ul id="toc-Security_and_privacy-sublist" class="vector-toc-list"> </ul> </li> <li id="toc-Production_deployment" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Production_deployment"> <div class="vector-toc-text"> <span class="vector-toc-numb">3</span> <span>Production deployment</span> </div> </a> <button aria-controls="toc-Production_deployment-sublist" class="cdx-button cdx-button--weight-quiet cdx-button--icon-only vector-toc-toggle"> <span class="vector-icon mw-ui-icon-wikimedia-expand"></span> <span>Toggle Production deployment subsection</span> </button> <ul id="toc-Production_deployment-sublist" class="vector-toc-list"> <li id="toc-Service_-_Service_interaction" class="vector-toc-list-item vector-toc-level-2"> <a class="vector-toc-link" href="#Service_-_Service_interaction"> <div class="vector-toc-text"> <span class="vector-toc-numb">3.1</span> <span>Service - Service interaction</span> </div> </a> <ul id="toc-Service_-_Service_interaction-sublist" class="vector-toc-list"> </ul> </li> </ul> </li> <li id="toc-Meta" class="vector-toc-list-item vector-toc-level-1 vector-toc-list-item-expanded"> <a class="vector-toc-link" href="#Meta"> <div class="vector-toc-text"> <span class="vector-toc-numb">4</span> <span>Meta</span> </div> </a> <ul id="toc-Meta-sublist" class="vector-toc-list"> </ul> </li> </ul> </div> </div> </nav> </div> </div> <div class="mw-content-container"> <main id="content" class="mw-body"> <header class="mw-body-header vector-page-titlebar"> <nav aria-label="Contents" class="vector-toc-landmark"> <div id="vector-page-titlebar-toc" class="vector-dropdown vector-page-titlebar-toc vector-button-flush-left" > <input type="checkbox" id="vector-page-titlebar-toc-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-vector-page-titlebar-toc" class="vector-dropdown-checkbox " aria-label="Toggle the table of contents" > <label id="vector-page-titlebar-toc-label" for="vector-page-titlebar-toc-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--icon-only " aria-hidden="true" ><span class="vector-icon mw-ui-icon-listBullet mw-ui-icon-wikimedia-listBullet"></span> <span class="vector-dropdown-label-text">Toggle the table of contents</span> </label> <div class="vector-dropdown-content"> <div id="vector-page-titlebar-toc-unpinned-container" class="vector-unpinned-container"> </div> </div> </div> </nav> <h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Wikimedia services policy</span></h1> <div class="mw-indicators"> </div> </header> <div class="vector-page-toolbar"> <div class="vector-page-toolbar-container"> <div id="left-navigation"> <nav aria-label="Namespaces"> <div id="p-associated-pages" class="vector-menu vector-menu-tabs mw-portlet mw-portlet-associated-pages" > <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li id="ca-nstab-main" class="selected vector-tab-noicon mw-list-item"><a href="/wiki/Wikimedia_services_policy" 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table.ambox-notice{border-left-color:var(--border-color-progressive,#36c)}.mw-parser-output table.ambox-speedy{background-color:var(--background-color-error-subtle,#fee7e6)}.mw-parser-output table.ambox-delete,.mw-parser-output table.ambox-speedy{border-left-color:var(--background-color-error--active,#b32424)}.mw-parser-output table.ambox-content{border-left-color:#f28500}.mw-parser-output table.ambox-style{border-left-color:#fc3}.mw-parser-output table.ambox-move{border-left-color:#9932cc}.mw-parser-output table.ambox-protection{border-left-color:var(--border-color-base,#a2a9b1)}html body.mediawiki .mw-parser-output .ambox.mbox-small{clear:right;float:right;margin:4px 0 4px 1em;box-sizing:border-box;width:238px;font-size:88%;line-height:1.25em}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;box-sizing:border-box;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}</style><table class="ambox ambox-notice plainlinks metadata" role="presentation"><tbody><tr><td class="mbox-image"><div style="width:52px"><span typeof="mw:File"><a href="/wiki/File:OOjs_UI_icon_check-constructive.svg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/30px-OOjs_UI_icon_check-constructive.svg.png" decoding="async" width="30" height="30" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/45px-OOjs_UI_icon_check-constructive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/f/f6/OOjs_UI_icon_check-constructive.svg/60px-OOjs_UI_icon_check-constructive.svg.png 2x" data-file-width="20" data-file-height="20"/></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This page documents an official <a href="/wiki/Special:MyLanguage/Development_policy" title="Special:MyLanguage/Development policy">Wikimedia development policy</a>. There is no current mechanism to make changes, as the <a href="/wiki/Special:MyLanguage/Requests_for_comment" title="Special:MyLanguage/Requests for comment">TechCom RFC process</a> is defunct.</div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r6605224">.mw-parser-output .tpl-sidebar{background-color:var(--background-color-interactive-subtle,#f8f9fa);border:1px solid var(--border-color-divider,#a2a9b1);color:var(--color-base,#202122);width:22em;padding:.2em;text-align:center;line-height:1.4em;font-size:88%}.mw-parser-output .tpl-sidebar-pagedir-ltr,.mw-parser-output .tpl-sidebar.tpl-sidebar-floatright{float:right;clear:right;margin:.5em 0 1em 1em}.mw-parser-output .tpl-sidebar-pagedir-rtl,.mw-parser-output .tpl-sidebar.tpl-sidebar-floatleft{float:left;clear:left;margin:.5em 1em 1em 0}.mw-parser-output .tpl-sidebar.tpl-sidebar-floatnone{float:none;clear:both;margin:.5em 0 1em 1em}.mw-parser-output .tpl-sidebar>caption{padding-bottom:.2em;font-size:125%;line-height:1.2em;font-weight:bold}.mw-parser-output .tpl-sidebar>tbody>tr>th,.mw-parser-output .tpl-sidebar>tbody>tr>td{padding:0}.mw-parser-output .tpl-sidebar .tpl-sidebar-topimage>td{padding:.4em 0}.mw-parser-output .tpl-sidebar-imagecaption{padding-top:.2em;line-height:1.2em}.mw-parser-output .tpl-sidebar .tpl-sidebar-pretitle>td{padding-top:.4em;line-height:1.2em}.mw-parser-output .tpl-sidebar .tpl-sidebar-topimage+.tpl-sidebar-pretitle>td{padding-top:.2em}.mw-parser-output .tpl-sidebar .tpl-sidebar-title>th{padding:.2em .4em .2em;font-size:145%;line-height:1.2em}.mw-parser-output .tpl-sidebar .tpl-sidebar-pretitle+.tpl-sidebar-title>th{padding-top:0}.mw-parser-output .tpl-sidebar .tpl-sidebar-image>td{padding:.2em 0 .4em}.mw-parser-output .tpl-sidebar .tpl-sidebar-abovebelow>td{padding:.3em .4em;font-weight:bold}.mw-parser-output .tpl-sidebar .tpl-sidebar-heading>th{padding-top:.2em}.mw-parser-output .tpl-sidebar .tpl-sidebar-image~.tpl-sidebar-heading-first>th{padding-top:.4em}.mw-parser-output .tpl-sidebar .tpl-sidebar-content>td{padding-bottom:.2em}.mw-parser-output .tpl-sidebar :not(.tpl-sidebar-heading)+.tpl-sidebar-content-first>td{padding-top:.2em}.mw-parser-output .tpl-sidebar-navbar>td{font-size:115%}.mw-parser-output .tpl-sidebar-pagedir-ltr .tpl-sidebar-navbar>td{text-align:right}.mw-parser-output .tpl-sidebar-pagedir-rtl .tpl-sidebar-navbar>td{text-align:left}</style><table class="vertical-navbox tpl-sidebar tpl-sidebar-pagedir-ltr nowraplinks" role="navigation" style="width:22em; border-spacing: 0.4em 0;"><tbody><tr class="tpl-sidebar-title"> <th class="" style="">Development policies</th> </tr><tr class="tpl-sidebar-content tpl-sidebar-content-first"> <td class="" style=";"> <style data-mw-deduplicate="TemplateStyles:r6219282">.mw-parser-output .plainlist ul{line-height:inherit;list-style:none none;margin:0}.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"> <ul><li><a href="/wiki/Special:MyLanguage/Development_policy" title="Special:MyLanguage/Development policy">Development policy</a><span style="display:none"><a href="/wiki/Development_policy" title="Development policy"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Wikimedia_Engineering_Architecture_Principles" title="Special:MyLanguage/Wikimedia Engineering Architecture Principles">Architecture principles</a><span style="display:none"><a href="/wiki/Wikimedia_Engineering_Architecture_Principles" title="Wikimedia Engineering Architecture Principles"> </a></span></li> <li><b><a href="/wiki/Special:MyLanguage/Wikimedia_services_policy" title="Special:MyLanguage/Wikimedia services policy">Services policy</a></b><span style="display:none"><a class="mw-selflink selflink"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Support_policy_for_PHP" title="Special:MyLanguage/Support policy for PHP">Support policy for PHP</a><span style="display:none"><a href="/wiki/Support_policy_for_PHP" title="Support policy for PHP"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Gerrit/Privilege_policy" title="Special:MyLanguage/Gerrit/Privilege policy">Gerrit privilege policy</a><span style="display:none"><a href="/wiki/Gerrit/Privilege_policy" title="Gerrit/Privilege policy"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Stable_interface_policy" title="Special:MyLanguage/Stable interface policy">Stable interface policy</a><span style="display:none"><a href="/wiki/Stable_interface_policy" title="Stable interface policy"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/MediaWiki_database_policy" title="Special:MyLanguage/MediaWiki database policy">MediaWiki database policy</a><span style="display:none"><a href="/wiki/MediaWiki_database_policy" title="MediaWiki database policy"> </a></span></li></ul> </div></td> </tr><tr class="tpl-sidebar-heading"> <th class="" style=";">See also</th> </tr><tr class="tpl-sidebar-content"> <td class="" style=";"> <a href="/wiki/Special:MyLanguage/Development_guidelines" title="Special:MyLanguage/Development guidelines">Development guidelines</a><span style="display:none"><a href="/wiki/Development_guidelines" title="Development guidelines"> </a></span></td> </tr><tr class="tpl-sidebar-navbar"> <td style=""><style data-mw-deduplicate="TemplateStyles:r4692751">.mw-parser-output .navbar{display:inline;font-size:88%;font-weight:normal}.mw-parser-output .navbar ul{display:inline;white-space:nowrap}.mw-parser-output .navbar li{word-spacing:-0.125em}.mw-parser-output .navbox .navbar{display:block;font-size:100%}.mw-parser-output .navbox-title .navbar{float:left;text-align:left;margin-right:0.5em;width:6em}</style><span class="noprint plainlinks navbar" style=""><small><span style="white-space:nowrap;word-spacing:-.12em;"><a href="/wiki/Template:Development_policy" title="Template:Development policy"><span style="" title="View this template">v</span></a><span style=""> <b>·</b> </span><a class="external text" href="https://www.mediawiki.org/wiki/Template_talk:Development_policy"><span style="" title="Discuss this template">d</span></a><span style=""> <b>·</b> </span><a class="external text" href="https://www.mediawiki.org/w/index.php?title=Template:Development_policy&action=edit"><span style="" title="Edit this template">e</span></a></span></small></span></td> </tr> </tbody></table> <p>This document deals with principles (e.g. an application needs to be observable and expose appropriate metrics) and not with implementation guidelines. Practical implementation guidelines will be written to detail how the principles enumerated in this document are to be applied in technical terms (e.g. the application must expose RED metrics from a <code>/metrics</code> endpoint in prometheus format, with a precise naming convention). The reason to split the two parts is that while we don't expect the principles to change much across time, but we do expect the implementation guidelines to change quicker due to technical evolution. </p><p>There are various aspects of the development and usage cycle of a new service, and several of those need to be as standardised as possible across the board in order not to make the complexity of our ecosystem become unmaintainable. In general, adopting a non-monolithic architecture has its costs, and unless standards are maintained regarding how different applications need to interoperate and how they're developed. </p><p>There are several aspects of the development of a service that need to be taken into account: </p> <ul><li>Development policies</li> <li>Security/privacy requirements</li> <li>Production deployment</li></ul> <p>In the next few sections we analyse the requirements a new service must fulfill in each of those categories. </p> <meta property="mw:PageProp/toc"/> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Development_policies" data-mw-thread-id="h-Development_policies"><span data-mw-comment-start="" id="h-Development_policies"></span>Development policies<span data-mw-comment-end="h-Development_policies"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_services_policy&action=edit&section=1" title="Edit section: Development policies"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Everything we develop should be free, open to collaboration and useful in itself. So, a new service must: </p> <ul><li>Actually do something</li> <li>Be created only if there is no well crafted, well maintained, architecturally compatible FLOSS software that provides comparable functionality that can be adopted and improved/modified if needed.</li> <li>Avoid needlessly duplicating features or functionality provided in other services</li> <li>Be licensed under an OSI-approved license</li> <li>Provide a configuration mechanism that does not involve changing the distributed code</li> <li>Use a language and toolset that have been approved by TechCom</li></ul> <p>While some of our services will be only useful in the WMF context, in other cases the standalone service is intended to be distributed for general use. In that case, it must have the following properties: </p> <ul><li>Have a documented installation and uninstallation process that conform to our implementation guidelines</li> <li>Have a documented upgrade process that conform with our implementation guidelines</li> <li>Be versioned using semver</li> <li>Indicate versions of MediaWiki with which it's compatible</li> <li>Provide a mechanism by which support (community or otherwise) can be requested</li> <li>Provide a mechanism by which patches can be proposed</li> <li>Provide a mechanism by which public security advisories are issued</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Security_and_privacy" data-mw-thread-id="h-Security_and_privacy"><span data-mw-comment-start="" id="h-Security_and_privacy"></span>Security and privacy<span data-mw-comment-end="h-Security_and_privacy"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_services_policy&action=edit&section=2" title="Edit section: Security and privacy"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>All features implemented as standalone services must have the following properties: </p> <ul><li>Minimise data collection for any type of PII</li> <li>Be compliant with the WMF privacy/data retention policies.</li> <li>Implement privacy controls that are <i>at least</i> equivalent to those of any calling service. For example, if the privacy controls of the calling service specify that IP addresses will not be stored for more than 90 days, the external service may not store IP addresses for longer than that time.</li> <li>Have a privacy policy and privacy practices that are compatible with the WMF/Wikimedia properties</li> <li>Have passed a <a href="/wiki/Special:MyLanguage/Security/SOP/Security_Readiness_Reviews" title="Special:MyLanguage/Security/SOP/Security Readiness Reviews">Security review</a></li> <li>Have resources allocated so that a prompt response to any security incident is possible</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Production_deployment" data-mw-thread-id="h-Production_deployment"><span data-mw-comment-start="" id="h-Production_deployment"></span>Production deployment<span data-mw-comment-end="h-Production_deployment"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_services_policy&action=edit&section=3" title="Edit section: Production deployment"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>If the standalone service is intended to be used in the Wikimedia production environment, it should comply with the guidelines above, and in addition must </p> <ul><li>Be deployable with standard WMF tooling (as specified in the implementation guidelines).</li> <li>Have an owner, and a plan for on-going maintenance. If the owner of a service is missing (because the team is disbanded/has a different focus), a new owner must be found via the code stewardship process</li> <li>Have logging that conforms to the WMF standards - specified in the service implementation guidelines</li> <li>Be able to collect and expose operational metrics according to the current WMF standards specified in the implementation guidelines.</li> <li>Have a <a href="https://en.wikipedia.org/wiki/Runbook" class="extiw" title="w:Runbook">runbook</a> for operational purposes.</li> <li>Support a multi-datacenter active-active (or active-passive) deployment.</li></ul> <ul><li><a href="https://en.wikipedia.org/wiki/Service_level_indicator" class="extiw" title="w:Service level indicator">Service Level Indicators</a> must be defined for the service, and <a href="https://en.wikipedia.org/wiki/Service-level_objective" class="extiw" title="w:Service-level objective">Service Level Objectives</a> should be agreed upon. Failure to meet said service level objectives SHOULD result action to bring the service back into operational agreed upon <a href="https://en.wikipedia.org/wiki/Service-level_objective" class="extiw" title="w:Service-level objective">Service Level Objectives</a>. The <a href="https://en.wikipedia.org/wiki/Service-level_objective" class="extiw" title="w:Service-level objective">Service Level Objectives</a> can of course be reevaluated and changed, but preferably not as a result of a violation but rather an informed process.</li> <li>Have pinned / pinnable dependencies that don't need to be downloaded at runtime and/or from untrusted source.</li> <li>Have backups and a restoration/emergency plan (if the service stores any data).</li> <li>Have users, or a plan to acquire users</li></ul> <div class="mw-heading mw-heading3"><h3 id="Service_-_Service_interaction" data-mw-thread-id="h-Service_-_Service_interaction-Production_deployment"><span data-mw-comment-start="" id="h-Service_-_Service_interaction-Production_deployment"></span>Service - Service interaction<span data-mw-comment-end="h-Service_-_Service_interaction-Production_deployment"></span></h3><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_services_policy&action=edit&section=4" title="Edit section: Service - Service interaction"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Services will likely interact with each other; if that is the case, measures must be taken not to make the whole system dependent on the failure of a single component. Also, increased observability in the flow of requests is needed. So any new service that needs to be deployed in production should: </p> <ul><li>Degrade gracefully its functionality if it can't access another service. If that's not possible, maybe the new service should be logically tied to the other. An exception is explicitly made for the MediaWiki API, given quite a few services might depend on its availability to be useful.</li> <li>Be able to perform requests to a specific hostname/ip provided via configuration.</li> <li>Be able to use infrastructure middleware for inter service communication functionalities including, but not limited to, encryption and circuit-breaking. Alternatively, the service SHOULD implement those functionalities internally.</li> <li>Add the appropriate tracing headers to the request, according to the WMF standards specified in the implementation guidelines.</li> <li>Log actions via the production logging facilities.</li></ul> <div class="mw-heading mw-heading2 ext-discussiontools-init-section"><h2 id="Meta" data-mw-thread-id="h-Meta"><span data-mw-comment-start="" id="h-Meta"></span>Meta<span data-mw-comment-end="h-Meta"></span></h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Wikimedia_services_policy&action=edit&section=5" title="Edit section: Meta"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>This policy was established in March 2019 by RFC <a href="https://phabricator.wikimedia.org/T208524" class="extiw" title="phab:T208524">T208524</a>. </p> <div class="navbox-styles nomobile"><style 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navbox-list navbox-odd" style="width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Special:MyLanguage/Development_policy" title="Special:MyLanguage/Development policy">Development policy</a><span style="display:none"><a href="/wiki/Development_policy" title="Development policy"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Wikimedia_Engineering_Architecture_Principles" title="Special:MyLanguage/Wikimedia Engineering Architecture Principles">Architecture principles</a><span style="display:none"><a href="/wiki/Wikimedia_Engineering_Architecture_Principles" title="Wikimedia Engineering Architecture Principles"> </a></span></li> <li><b><a href="/wiki/Special:MyLanguage/Wikimedia_services_policy" title="Special:MyLanguage/Wikimedia services policy">Services policy</a></b><span style="display:none"><a class="mw-selflink selflink"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Support_policy_for_PHP" title="Special:MyLanguage/Support policy for PHP">Support policy for PHP</a><span style="display:none"><a href="/wiki/Support_policy_for_PHP" title="Support policy for PHP"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Gerrit/Privilege_policy" title="Special:MyLanguage/Gerrit/Privilege policy">Gerrit/Privilege policy</a><span style="display:none"><a href="/wiki/Gerrit/Privilege_policy" title="Gerrit/Privilege policy"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Stable_interface_policy" title="Special:MyLanguage/Stable interface policy">Stable interface policy</a><span style="display:none"><a href="/wiki/Stable_interface_policy" title="Stable interface policy"> </a></span> <ul><li><a href="/wiki/Special:MyLanguage/Stable_interface_policy/Frontend" title="Special:MyLanguage/Stable interface policy/Frontend">Frontend</a><span style="display:none"><a href="/wiki/Stable_interface_policy/Frontend" title="Stable interface policy/Frontend"> </a></span></li></ul></li> <li><a href="/wiki/Special:MyLanguage/MediaWiki_database_policy" title="Special:MyLanguage/MediaWiki database policy">MediaWiki database policy</a><span style="display:none"><a href="/wiki/MediaWiki_database_policy" title="MediaWiki database policy"> </a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">General guidelines</th><td class="navbox-list1 navbox-list navbox-even" style="width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Special:MyLanguage/Security_for_developers" title="Special:MyLanguage/Security for developers">Security for developers</a><span style="display:none"><a href="/wiki/Security_for_developers" title="Security for developers"> </a></span></li> <li><a href="https://wikitech.wikimedia.org/wiki/Performance/Guides/Backend_performance_practices" class="extiw" title="wikitech:Performance/Guides/Backend performance practices">Performance guidelines</a></li> <li><a href="/wiki/Special:MyLanguage/Gerrit/Commit_message_guidelines" title="Special:MyLanguage/Gerrit/Commit message guidelines">Commit message guidelines</a><span style="display:none"><a href="/wiki/Gerrit/Commit_message_guidelines" title="Gerrit/Commit message guidelines"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Security_checklist_for_developers" title="Special:MyLanguage/Security checklist for developers">Security checklist for developers</a><span style="display:none"><a href="/wiki/Security_checklist_for_developers" title="Security checklist for developers"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Localisation" title="Special:MyLanguage/Localisation">Localisation</a><span style="display:none"><a href="/wiki/Localisation" title="Localisation"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Design/Living_style_guide" title="Special:MyLanguage/Design/Living style guide">Design style guide</a><span style="display:none"><a 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style="display:none"><a href="/wiki/Manual:Pre-commit_checklist" title="Manual:Pre-commit checklist"> </a></span></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Code conventions</th><td class="navbox-list1 navbox-list navbox-odd" style="width:100%;padding:0px"><div style="padding:0em 0.25em"> <ul><li><a href="/wiki/Special:MyLanguage/Manual:Coding_conventions#Code_structure" title="Special:MyLanguage/Manual:Coding conventions">All languages</a><span style="display:none"><a href="/wiki/Manual:Coding_conventions#Code_structure" title="Manual:Coding conventions"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Manual:Coding_conventions/PHP" title="Special:MyLanguage/Manual:Coding conventions/PHP">PHP</a><span style="display:none"><a href="/wiki/Manual:Coding_conventions/PHP" title="Manual:Coding conventions/PHP"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Manual:PHP_unit_testing/Writing_unit_tests#Test_conventions" 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title="Special:MyLanguage/Manual:Coding conventions/SVG">SVG</a><span style="display:none"><a href="/wiki/Manual:Coding_conventions/SVG" title="Manual:Coding conventions/SVG"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Manual:Coding_conventions/Vue" title="Special:MyLanguage/Manual:Coding conventions/Vue">Vue</a><span style="display:none"><a href="/wiki/Manual:Coding_conventions/Vue" title="Manual:Coding conventions/Vue"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Manual:Coding_conventions/Database" title="Special:MyLanguage/Manual:Coding conventions/Database">Database schemas</a><span style="display:none"><a href="/wiki/Manual:Coding_conventions/Database" title="Manual:Coding conventions/Database"> </a></span></li> <li><a href="/wiki/Special:MyLanguage/Product_Analytics/Style_guide" title="Special:MyLanguage/Product Analytics/Style guide">Analytics (Python, R, SQL)</a><span style="display:none"><a href="/wiki/Product_Analytics/Style_guide" title="Product 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