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Collected in Firefox</span></p> <ul> <li class="toctree-l1"><a class="reference internal" href="../../../metrics/index.html">Metrics</a></li> </ul> </div> </div> </nav> <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap"><nav class="wy-nav-top" aria-label="Mobile navigation menu" > <i data-toggle="wy-nav-top" class="fa fa-bars"></i> <a href="../../../index.html">Firefox Source Docs</a> </nav> <div class="wy-nav-content"> <div class="rst-content"> <div role="navigation" aria-label="Page navigation"> <ul class="wy-breadcrumbs"> <li><a href="../../../index.html" class="icon icon-home" aria-label="Home"></a></li> <li class="breadcrumb-item"><a href="../../index.html">Toolkit</a></li> <li class="breadcrumb-item active">Telemetry</li> <li class="wy-breadcrumbs-aside"> <a href="https://bugzilla.mozilla.org/enter_bug.cgi?product=Developer+Infrastructure&component=Firefox+Source+Docs%3A+Content&short_desc=Documentation+issue+on+toolkit/components/telemetry/index&comment=URL+=+https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/index.html&bug_file_loc=https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/index.html" rel="nofollow" >Report an issue</a > / <a href="../../../_sources/toolkit/components/telemetry/index.rst.txt" rel="nofollow"> View page source</a > </li> </ul> <hr/> </div> <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> <div itemprop="articleBody"> <section id="telemetry"> <h1>Telemetry<a class="headerlink" href="#telemetry" title="Link to this heading">¶</a></h1> <p>Telemetry is a feature that allows data collection. This is being used to collect performance metrics and other information about how Firefox performs in the wild, e.g. update events or session lengths.</p> <p>There are two main ways of gathering data, Desktop Telemetry - documented here - which is used in Firefox Desktop and <a class="reference external" href="https://docs.telemetry.mozilla.org/concepts/glean/glean.html">Glean</a> which is Mozilla’s newer telemetry framework and used in all Mozilla projects needing data collection. Information which is gathered is called a probe in Desktop Telemetry or a metric in Glean. The data is being sent in so-called pings. When pings cannot be sent immediately, caching is implemented as well.</p> <p>In many cases, <a class="reference external" href="../glean/index.html">Firefox on Glean (FOG)</a> (the Firefox Desktop integration of Glean) is to be preferred over Telemetry. If your data would benefit from being in Telemetry as well as Glean, please consult the documentation for the <a class="reference external" href="../glean/user/gifft.html">Glean Interface For Firefox Telemetry (GIFFT)</a>.</p> <p><em>Note:</em> Mozilla’s <a class="reference external" href="https://wiki.mozilla.org/Firefox/Data_Collection">data collection policy</a> documents the process and requirements that are applied here.</p> <div class="toctree-wrapper compound"> <ul> <li class="toctree-l1"><a class="reference internal" href="start/index.html">Getting started</a><ul> <li class="toctree-l2"><a class="reference internal" href="start/adding-a-new-probe.html">Adding a new Telemetry probe</a></li> <li class="toctree-l2"><a class="reference internal" href="start/report-gecko-telemetry-in-glean.html">How to report Gecko Telemetry in engine-gecko via Glean</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="concepts/index.html">Concepts</a></li> <li class="toctree-l1"><a class="reference internal" href="collection/index.html">Data collection</a></li> <li class="toctree-l1"><a class="reference internal" href="data/index.html">Data documentation</a><ul> <li class="toctree-l2"><a class="reference internal" href="data/common-ping.html">Common ping format</a></li> <li class="toctree-l2"><a class="reference internal" href="data/environment.html">Environment</a></li> <li class="toctree-l2"><a class="reference internal" href="data/main-ping.html">“main” ping</a><ul class="simple"> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="data/crash-ping.html">Crash ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/backgroundhangmonitor-ping.html">“backgroundhangmonitor” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/anonymous-ping.html">“anonymous” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/first-shutdown-ping.html">“first-shutdown” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/addons-malware-ping.html">Add-ons malware ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/coverage-ping.html">“coverage” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/default-browser-ping.html">“default-browser” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/deletion-request-ping.html">“deletion-request” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/downgrade-ping.html">“downgrade” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/event-ping.html">“event” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/health-ping.html">“health” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/heartbeat-ping.html">“heartbeat” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/install-ping.html">Install Ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/launcher-process-failure-ping.html">Launcher Process Failure ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/modules-ping.html">“modules” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/new-profile-ping.html">“new-profile” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/sync-ping.html">“sync” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/third-party-modules-ping.html">“third-party-modules” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/uitour-ping.html">“uitour-tag” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/uninstall-ping.html">“uninstall” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/update-ping.html">“update” ping</a></li> <li class="toctree-l2"><a class="reference internal" href="data/xfocsp-error-report-ping.html">“xfocsp-error-report” ping</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="internals/index.html">Internals</a><ul> <li class="toctree-l2"><a class="reference internal" href="internals/integration_tests/index.html">Integration Tests</a></li> <li class="toctree-l2"><a class="reference internal" href="internals/mentored-bugs.html">Template for Mentored Bugs</a></li> <li class="toctree-l2"><a class="reference internal" href="internals/pingsender.html">Ping Sender</a></li> <li class="toctree-l2"><a class="reference internal" href="internals/preferences.html">Preferences and Defines</a></li> <li class="toctree-l2"><a class="reference internal" href="internals/review.html">Telemetry review guidelines</a></li> <li class="toctree-l2"><a class="reference internal" href="internals/tests.html">Tests</a></li> </ul> </li> <li class="toctree-l1"><a class="reference internal" href="obsolete/index.html">Obsolete Documentation</a><ul> <li class="toctree-l2"><a class="reference internal" href="obsolete/uitelemetry/index.html">UITelemetry data format (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/fhr/index.html">Firefox Health Report (Obsolete)</a><ul> <li class="toctree-l3"><a class="reference internal" href="obsolete/fhr/architecture.html">Architecture</a></li> <li class="toctree-l3"><a class="reference internal" href="obsolete/fhr/dataformat.html">Payload Format</a></li> <li class="toctree-l3"><a class="reference internal" href="obsolete/fhr/identifiers.html">Identifiers</a></li> </ul> </li> <li class="toctree-l2"><a class="reference internal" href="obsolete/hybrid-content.html">Hybrid Content Telemetry (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/activation-ping.html">“activation” ping (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/core-ping.html">“core” ping (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/deletion-ping.html">“deletion” ping (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/ecosystem-telemetry.html">Ecosystem Telemetry (obsolete)</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/geckoview-streaming.html">GeckoView Streaming API</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/geckoview-streaming.html#details">Details</a></li> <li class="toctree-l2"><a class="reference internal" href="obsolete/optout-ping.html">“optout” ping (obsolete)</a></li> </ul> </li> </ul> </div> </section> </div> </div> <footer><div class="rst-footer-buttons" role="navigation" aria-label="Footer"> <a href="../../modules/subprocess/toolkit_modules/subprocess/index.html" class="btn btn-neutral float-left" title="Subprocess Module" accesskey="p" rel="prev"><span class="fa 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