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<h1 id="room-and-user-statistics"><a class="header" href="#room-and-user-statistics">Room and User Statistics</a></h1>
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<p>Synapse maintains room and user statistics (as well as a cache of room state),
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in various tables. These can be used for administrative purposes but are also
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used when generating the public room directory.</p>
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<h1 id="synapse-developer-documentation"><a class="header" href="#synapse-developer-documentation">Synapse Developer Documentation</a></h1>
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<h2 id="high-level-concepts"><a class="header" href="#high-level-concepts">High-Level Concepts</a></h2>
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<h3 id="definitions"><a class="header" href="#definitions">Definitions</a></h3>
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<ul>
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<li><strong>subject</strong>: Something we are tracking stats about – currently a room or user.</li>
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<li><strong>current row</strong>: An entry for a subject in the appropriate current statistics
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table. Each subject can have only one.</li>
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<li><strong>historical row</strong>: An entry for a subject in the appropriate historical
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statistics table. Each subject can have any number of these.</li>
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</ul>
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<h3 id="overview"><a class="header" href="#overview">Overview</a></h3>
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<p>Stats are maintained as time series. There are two kinds of column:</p>
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<ul>
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<li>absolute columns – where the value is correct for the time given by <code>end_ts</code>
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in the stats row. (Imagine a line graph for these values)
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<ul>
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<li>They can also be thought of as 'gauges' in Prometheus, if you are familiar.</li>
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</ul>
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</li>
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<li>per-slice columns – where the value corresponds to how many of the occurrences
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occurred within the time slice given by <code>(end_ts − bucket_size)…end_ts</code>
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or <code>start_ts…end_ts</code>. (Imagine a histogram for these values)</li>
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</ul>
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<p>Stats are maintained in two tables (for each type): current and historical.</p>
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<p>Current stats correspond to the present values. Each subject can only have one
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entry.</p>
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<p>Historical stats correspond to values in the past. Subjects may have multiple
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entries.</p>
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<h2 id="concepts-around-the-management-of-stats"><a class="header" href="#concepts-around-the-management-of-stats">Concepts around the management of stats</a></h2>
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<h3 id="current-rows"><a class="header" href="#current-rows">Current rows</a></h3>
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<p>Current rows contain the most up-to-date statistics for a room.
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They only contain absolute columns</p>
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<h3 id="historical-rows"><a class="header" href="#historical-rows">Historical rows</a></h3>
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<p>Historical rows can always be considered to be valid for the time slice and
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end time specified.</p>
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<ul>
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<li>historical rows will not exist for every time slice – they will be omitted
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if there were no changes. In this case, the following assumptions can be
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made to interpolate/recreate missing rows:
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<ul>
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<li>absolute fields have the same values as in the preceding row</li>
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<li>per-slice fields are zero (<code>0</code>)</li>
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</ul>
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</li>
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<li>historical rows will not be retained forever – rows older than a configurable
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time will be purged.</li>
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</ul>
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<h4 id="purge"><a class="header" href="#purge">Purge</a></h4>
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<p>The purging of historical rows is not yet implemented.</p>
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