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<h1 id="monthly-active-users"><a class="header" href="#monthly-active-users">Monthly Active Users</a></h1>
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<p>Synapse can be configured to record the number of monthly active users (also referred to as MAU) on a given homeserver.
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For clarity's sake, MAU only tracks local users.</p>
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<p>Please note that the metrics recorded by the <a href="../../usage/administration/monitoring/reporting_homeserver_usage_statistics.html">Homeserver Usage Stats</a>
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are calculated differently. The <code>monthly_active_users</code> from the usage stats does not take into account any
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of the rules below, and counts any users who have made a request to the homeserver in the last 30 days.</p>
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<p>See the <a href="../../usage/configuration/config_documentation.html#limit_usage_by_mau">configuration manual</a> for details on how to configure MAU.</p>
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<h2 id="calculating-active-users"><a class="header" href="#calculating-active-users">Calculating active users</a></h2>
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<p>Individual user activity is measured in active days. If a user performs an action, the exact time of that action is then recorded. When
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calculating the MAU figure, any users with a recorded action in the last 30 days are considered part of the cohort. Days are measured
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as a rolling window from the current system time to 30 days ago.</p>
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<p>So for example, if Synapse were to calculate the active users on the 15th July at 13:25, it would include any activity from 15th June 13:25 onwards.</p>
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<p>A user is <strong>never</strong> considered active if they are either:</p>
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<ul>
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<li>Part of the trial day cohort (described below)</li>
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<li>Owned by an application service.
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<ul>
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<li>Note: This <strong>only</strong> covers users that are part of an application service <code>namespaces.users</code> registration. The namespace
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must also be marked as <code>exclusive</code>.</li>
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</ul>
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</li>
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</ul>
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<p>Otherwise, any request to Synapse will mark the user as active. Please note that registration will not mark a user as active <em>unless</em>
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they register with a 3pid that is included in the config field <code>mau_limits_reserved_threepids</code>.</p>
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<p>The Prometheus metric for MAU is refreshed every 5 minutes.</p>
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<p>Once an hour, Synapse checks to see if any users are inactive (with only activity timestamps later than 30 days). These users
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are removed from the active users cohort. If they then become active, they are immediately restored to the cohort.</p>
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<p>It is important to note that <strong>deactivated</strong> users are not immediately removed from the pool of active users, but as these users won't
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perform actions they will eventually be removed from the cohort.</p>
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<h3 id="trial-days"><a class="header" href="#trial-days">Trial days</a></h3>
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<p>If the config option <code>mau_trial_days</code> is set, a user must have been active this many days <strong>after</strong> registration to be active. A user is in the
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trial period if their registration timestamp (also known as the <code>creation_ts</code>) is less than <code>mau_trial_days</code> old.</p>
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<p>As an example, if <code>mau_trial_days</code> is set to <code>3</code> and a user is active <strong>after</strong> 3 days (72 hours from registration time) then they will be counted as active.</p>
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<p>The <code>mau_appservice_trial_days</code> config further extends this rule by applying different durations depending on the <code>appservice_id</code> of the user.
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Users registered by an application service will be recorded with an <code>appservice_id</code> matching the <code>id</code> key in the registration file for that service.</p>
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<h2 id="limiting-usage-of-the-homeserver-when-the-maximum-mau-is-reached"><a class="header" href="#limiting-usage-of-the-homeserver-when-the-maximum-mau-is-reached">Limiting usage of the homeserver when the maximum MAU is reached</a></h2>
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<p>If both config options <code>limit_usage_by_mau</code> and <code>max_mau_value</code> is set, and the current MAU value exceeds the maximum value, the
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homeserver will begin to block some actions.</p>
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<p>Individual users matching <strong>any</strong> of the below criteria never have their actions blocked:</p>
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<ul>
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<li>Considered part of the cohort of MAU users.</li>
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<li>Considered part of the trial period.</li>
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<li>Registered as a <code>support</code> user.</li>
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<li>Application service users if <code>track_appservice_user_ips</code> is NOT set.</li>
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</ul>
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<p>Please not that server admins are <strong>not</strong> exempt from blocking.</p>
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<p>The following actions are blocked when the MAU limit is exceeded:</p>
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<ul>
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<li>Logging in</li>
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<li>Sending events</li>
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<li>Creating rooms</li>
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<li>Syncing</li>
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</ul>
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<p>Registration is also blocked for all new signups <em>unless</em> the user is registering with a threepid included in the <code>mau_limits_reserved_threepids</code>
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config value.</p>
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<p>When a request is blocked, the response will have the <code>errcode</code> <code>M_RESOURCE_LIMIT_EXCEEDED</code>.</p>
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<h2 id="metrics"><a class="header" href="#metrics">Metrics</a></h2>
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<p>Synapse records several different prometheus metrics for MAU.</p>
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<p><code>synapse_admin_mau_current</code> records the current MAU figure for native (non-application-service) users.</p>
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<p><code>synapse_admin_mau_max</code> records the maximum MAU as dictated by the <code>max_mau_value</code> config value.</p>
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<p><code>synapse_admin_mau_current_mau_by_service</code> records the current MAU including application service users. The label <code>app_service</code> can be used
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to filter by a specific service ID. This <em>also</em> includes non-application-service users under <code>app_service=native</code> .</p>
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<p><code>synapse_admin_mau_registered_reserved_users</code> records the number of users specified in <code>mau_limits_reserved_threepids</code> which have
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registered accounts on the homeserver.</p>
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