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develop/consent_tracking.html
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@ -176,7 +176,7 @@ database and shows a success page.</p>
<p>To enable this, first create templates for the policy and success pages.
These should be stored on the local filesystem.</p>
<p>These templates use the <a href="http://jinja.pocoo.org">Jinja2</a> templating language,
and <a href="https://github.com/element.-hq/synapse/tree/develop/docs/privacy_policy_templates/">docs/privacy_policy_templates</a>
and <a href="https://github.com/element-hq/synapse/tree/develop/docs/privacy_policy_templates/">docs/privacy_policy_templates</a>
gives examples of the sort of thing that can be done.</p>
<p>Note that the templates must be stored under a name giving the language of the
template - currently this must always be <code>en</code> (for &quot;English&quot;);

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@ -168,10 +168,10 @@ before. Here, by way of an arbitrary example, is the top of <code>git log --grap
<p>Note how the commit comment explains clearly what is changing and why. Also
note the <em>absence</em> of merge commits, as well as the absence of commits called
things like (to pick a few culprits):
<a href="https://github.com/element.-hq/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/element.-hq/synapse/commit/474810d9d">“fix broken
<a href="https://github.com/element-hq/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/element-hq/synapse/commit/474810d9d">“fix broken
test”</a>,
<a href="https://github.com/element.-hq/synapse/commit/c9d72e457">“oops”</a>,
<a href="https://github.com/element.-hq/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/element.-hq/synapse/commit/707374d5d">“Who's
<a href="https://github.com/element-hq/synapse/commit/c9d72e457">“oops”</a>,
<a href="https://github.com/element-hq/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/element-hq/synapse/commit/707374d5d">“Who's
the president?”</a>.</p>
<p>There are a number of reasons why keeping a clean commit history is a good
thing:</p>

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@ -160,7 +160,7 @@
</div>
<h2 id="streams"><a class="header" href="#streams">Streams</a></h2>
<p>Synapse has a concept of &quot;streams&quot;, which are roughly described in <a href="https://github.com/element.-hq/synapse/blob/develop/synapse/storage/util/id_generators.py"><code>id_generators.py</code></a>.
<p>Synapse has a concept of &quot;streams&quot;, which are roughly described in <a href="https://github.com/element-hq/synapse/blob/develop/synapse/storage/util/id_generators.py"><code>id_generators.py</code></a>.
Generally speaking, streams are a series of notifications that something in Synapse's database has changed that the application might need to respond to.
For example:</p>
<ul>
@ -168,9 +168,9 @@ For example:</p>
<li>The account data stream reports changes to users' <a href="https://spec.matrix.org/v1.7/client-server-api/#client-config">account data</a>.</li>
<li>The to-device stream reports when a device has a new <a href="https://spec.matrix.org/v1.7/client-server-api/#send-to-device-messaging">to-device message</a>.</li>
</ul>
<p>See <a href="https://github.com/element.-hq/synapse/blob/develop/synapse/replication/tcp/streams/__init__.py"><code>synapse.replication.tcp.streams</code></a> for the full list of streams.</p>
<p>See <a href="https://github.com/element-hq/synapse/blob/develop/synapse/replication/tcp/streams/__init__.py"><code>synapse.replication.tcp.streams</code></a> for the full list of streams.</p>
<p>It is very helpful to understand the streams mechanism when working on any part of Synapse that needs to respond to changes—especially if those changes are made by different workers.
To that end, let's describe streams formally, paraphrasing from the docstring of <a href="https://github.com/element.-hq/synapse/blob/a719b703d9bd0dade2565ddcad0e2f3a7a9d4c37/synapse/storage/util/id_generators.py#L96"><code>AbstractStreamIdGenerator</code></a>.</p>
To that end, let's describe streams formally, paraphrasing from the docstring of <a href="https://github.com/element-hq/synapse/blob/a719b703d9bd0dade2565ddcad0e2f3a7a9d4c37/synapse/storage/util/id_generators.py#L96"><code>AbstractStreamIdGenerator</code></a>.</p>
<h3 id="definition"><a class="header" href="#definition">Definition</a></h3>
<p>A stream is an append-only log <code>T1, T2, ..., Tn, ...</code> of facts<sup class="footnote-reference"><a href="#1">1</a></sup> which grows over time.
Only &quot;writers&quot; can add facts to a stream, and there may be multiple writers.</p>

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@ -200,7 +200,7 @@ following documentation:</p>
<li>
<p>Read the <a href="development/contributing_guide.html">Contributing Guide</a>. It is meant
to walk new contributors through the process of developing and submitting a
change to the Synapse codebase (which is <a href="https://github.com/element.-hq/synapse">hosted on
change to the Synapse codebase (which is <a href="https://github.com/element-hq/synapse">hosted on
GitHub</a>).</p>
</li>
<li>
@ -210,9 +210,9 @@ how to <a href="development/contributing_guide.html#run-the-linters">lint</a> an
<a href="development/contributing_guide.html#8-test-test-test">test</a> your code.</p>
</li>
<li>
<p>Look at <a href="https://github.com/element.-hq/synapse/issues">the issue tracker</a> for
<p>Look at <a href="https://github.com/element-hq/synapse/issues">the issue tracker</a> for
bugs to fix or features to add. If you're new, it may be best to start with
those labeled <a href="https://github.com/element.-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
those labeled <a href="https://github.com/element-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
issue</a>.</p>
</li>
<li>
@ -228,7 +228,7 @@ do so!</p>
</li>
<li>
<p>And finally, contribute to this documentation! The source for which is
<a href="https://github.com/element.-hq/synapse/tree/develop/docs">located here</a>.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/docs">located here</a>.</p>
</li>
</ul>
<h2 id="reporting-a-security-vulnerability"><a class="header" href="#reporting-a-security-vulnerability">Reporting a security vulnerability</a></h2>

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@ -239,8 +239,8 @@ the listener port configured with the <code>metrics</code> resource.</p>
<p>Restart Prometheus.</p>
</li>
<li>
<p>Consider using the <a href="https://github.com/element.-hq/synapse/tree/master/contrib/grafana/">grafana dashboard</a>
and required <a href="https://github.com/element.-hq/synapse/tree/master/contrib/prometheus/">recording rules</a></p>
<p>Consider using the <a href="https://github.com/element-hq/synapse/tree/master/contrib/grafana/">grafana dashboard</a>
and required <a href="https://github.com/element-hq/synapse/tree/master/contrib/prometheus/">recording rules</a></p>
</li>
</ol>
<h2 id="monitoring-workers"><a class="header" href="#monitoring-workers">Monitoring workers</a></h2>

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@ -168,7 +168,7 @@ the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dict
either the output of the module's <code>parse_config</code> static method (see below), or the
configuration associated with the module in Synapse's configuration file.</p>
<p>See the documentation for the <code>ModuleApi</code> class
<a href="https://github.com/element.-hq/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
<a href="https://github.com/element-hq/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
<h2 id="when-synapse-runs-with-several-modules-configured"><a class="header" href="#when-synapse-runs-with-several-modules-configured">When Synapse runs with several modules configured</a></h2>
<p>If Synapse is running with other modules configured, the order each module appears in
within the <code>modules</code> section of the Synapse configuration file might restrict what it can

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@ -198,7 +198,7 @@ following documentation:</p>
<li>
<p>Read the <a href="development/contributing_guide.html">Contributing Guide</a>. It is meant
to walk new contributors through the process of developing and submitting a
change to the Synapse codebase (which is <a href="https://github.com/element.-hq/synapse">hosted on
change to the Synapse codebase (which is <a href="https://github.com/element-hq/synapse">hosted on
GitHub</a>).</p>
</li>
<li>
@ -208,9 +208,9 @@ how to <a href="development/contributing_guide.html#run-the-linters">lint</a> an
<a href="development/contributing_guide.html#8-test-test-test">test</a> your code.</p>
</li>
<li>
<p>Look at <a href="https://github.com/element.-hq/synapse/issues">the issue tracker</a> for
<p>Look at <a href="https://github.com/element-hq/synapse/issues">the issue tracker</a> for
bugs to fix or features to add. If you're new, it may be best to start with
those labeled <a href="https://github.com/element.-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
those labeled <a href="https://github.com/element-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
issue</a>.</p>
</li>
<li>
@ -226,7 +226,7 @@ do so!</p>
</li>
<li>
<p>And finally, contribute to this documentation! The source for which is
<a href="https://github.com/element.-hq/synapse/tree/develop/docs">located here</a>.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/docs">located here</a>.</p>
</li>
</ul>
<h2 id="reporting-a-security-vulnerability"><a class="header" href="#reporting-a-security-vulnerability">Reporting a security vulnerability</a></h2>
@ -2503,7 +2503,7 @@ becomes stable.</p>
<p>As announced with the release of <a href="upgrade.html#deprecation-of-the-user_may_create_room_with_invites-module-callback">Synapse 1.47.0</a>,
the deprecated <code>user_may_create_room_with_invites</code> module callback has been removed.</p>
<p>Modules relying on it can instead implement <a href="https://element-hq.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
and use the <a href="https://github.com/element.-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
and use the <a href="https://github.com/element-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
module API to infer whether the invite is happening while creating a room (see <a href="https://github.com/matrix-org/synapse-domain-rule-checker/blob/e7d092dd9f2a7f844928771dbfd9fd24c2332e48/synapse_domain_rule_checker/__init__.py#L56-L89">this function</a>
as an example). Alternately, modules can also implement <a href="https://element-hq.github.io/synapse/latest/modules/third_party_rules_callbacks.html#on_create_room"><code>on_create_room</code></a>.</p>
<h1 id="upgrading-to-v1520"><a class="header" href="#upgrading-to-v1520">Upgrading to v1.52.0</a></h1>
@ -2540,7 +2540,7 @@ longer supported upstream.</p>
<p>The <code>user_may_create_room_with_invites</code> is deprecated and will be removed in a future
version of Synapse. Modules implementing this callback can instead implement
<a href="https://element-hq.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
and use the <a href="https://github.com/element.-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
and use the <a href="https://github.com/element-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
module API method to infer whether the invite is happening in the context of creating a
room.</p>
<p>We plan to remove this callback in January 2022.</p>
@ -2573,8 +2573,8 @@ federation requests.</p>
<a href="https://element-hq.github.io/synapse/latest/admin_api/rooms.html#delete-room-api">Delete Room API</a>.</p>
<h2 id="user-interactive-authentication-fallback-templates-can-now-display-errors"><a class="header" href="#user-interactive-authentication-fallback-templates-can-now-display-errors">User-interactive authentication fallback templates can now display errors</a></h2>
<p>This may affect you if you make use of custom HTML templates for the
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates/recaptcha.html">reCAPTCHA (<code>synapse/res/templates/recaptcha.html</code>)</a> or
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates/terms.html">terms (<code>synapse/res/templates/terms.html</code>)</a> fallback pages.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates/recaptcha.html">reCAPTCHA (<code>synapse/res/templates/recaptcha.html</code>)</a> or
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates/terms.html">terms (<code>synapse/res/templates/terms.html</code>)</a> fallback pages.</p>
<p>The template is now provided an <code>error</code> variable if the authentication
process failed. See the default templates linked above for an example.</p>
<h2 id="removal-of-out-of-date-email-pushers"><a class="header" href="#removal-of-out-of-date-email-pushers">Removal of out-of-date email pushers</a></h2>
@ -2958,7 +2958,7 @@ endpoint can be handled</p>
update your reverse proxy configuration to reflect this change.</p>
<h2 id="new-html-templates"><a class="header" href="#new-html-templates">New HTML templates</a></h2>
<p>A new HTML template,
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/res/templates/password_reset_confirmation.html">password_reset_confirmation.html</a>,
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/res/templates/password_reset_confirmation.html">password_reset_confirmation.html</a>,
has been added to the <code>synapse/res/templates</code> directory. If you are
using a custom template directory, you may want to copy the template
over and modify it.</p>
@ -3038,7 +3038,7 @@ INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
is configured to use SSO and a custom
<code>sso_redirect_confirm_template_dir</code> configuration then these templates
will need to be copied from
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates"><code>synapse/res/templates</code></a> into that directory.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates"><code>synapse/res/templates</code></a> into that directory.</p>
<h2 id="synapse-sso-plugins-method-deprecation"><a class="header" href="#synapse-sso-plugins-method-deprecation">Synapse SSO Plugins Method Deprecation</a></h2>
<p>Plugins using the <code>complete_sso_login</code> method of
<code>synapse.module_api.ModuleApi</code> should update to using the async/await
@ -3169,7 +3169,7 @@ included.</p>
<p>Synapse will expect these files to exist inside the configured template
directory, and <strong>will fail to start</strong> if they are absent. To view the
default templates, see
<a href="https://github.com/element.-hq/synapse/tree/master/synapse/res/templates">synapse/res/templates</a>.</p>
<a href="https://github.com/element-hq/synapse/tree/master/synapse/res/templates">synapse/res/templates</a>.</p>
<h2 id="3pid-verification-changes"><a class="header" href="#3pid-verification-changes">3pid verification changes</a></h2>
<p><strong>Note: As of this release, users will be unable to add phone numbers or
email addresses to their accounts, without changes to the Synapse
@ -4933,7 +4933,7 @@ caches:
</code></pre>
<p>If you are running multiple workers, you must individually update the worker
config file and send this signal to each worker process.</p>
<p>If you're using the <a href="https://github.com/element.-hq/synapse/blob/develop/contrib/systemd/matrix-synapse.service">example systemd service</a>
<p>If you're using the <a href="https://github.com/element-hq/synapse/blob/develop/contrib/systemd/matrix-synapse.service">example systemd service</a>
file in Synapse's <code>contrib</code> directory, you can send a <code>SIGHUP</code> signal by using
<code>systemctl reload matrix-synapse</code>.</p>
<hr />
@ -7823,7 +7823,7 @@ remote endpoint at 10.1.2.3:9999.</p>
<div style="break-before: page; page-break-before: always;"></div><h1 id="templates"><a class="header" href="#templates">Templates</a></h1>
<p>Synapse uses parametrised templates to generate the content of emails it sends and
webpages it shows to users.</p>
<p>By default, Synapse will use the templates listed <a href="https://github.com/element.-hq/synapse/tree/master/synapse/res/templates">here</a>.
<p>By default, Synapse will use the templates listed <a href="https://github.com/element-hq/synapse/tree/master/synapse/res/templates">here</a>.
Server admins can configure an additional directory for Synapse to look for templates
in, allowing them to specify custom templates:</p>
<pre><code class="language-yaml">templates:
@ -8902,7 +8902,7 @@ usually returned as part of the <a href="https://spec.matrix.org/latest/client-s
<h3 id="default-openid-mapping-provider"><a class="header" href="#default-openid-mapping-provider">Default OpenID Mapping Provider</a></h3>
<p>Synapse has a built-in OpenID mapping provider if a custom provider isn't
specified in the config. It is located at
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/handlers/oidc.py"><code>synapse.handlers.oidc.JinjaOidcMappingProvider</code></a>.</p>
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/handlers/oidc.py"><code>synapse.handlers.oidc.JinjaOidcMappingProvider</code></a>.</p>
<h2 id="saml-mapping-providers"><a class="header" href="#saml-mapping-providers">SAML Mapping Providers</a></h2>
<p>The SAML mapping provider can be customized by editing the
<a href="usage/configuration/config_documentation.html#saml2_config"><code>saml2_config.user_mapping_provider.module</code></a>
@ -9017,7 +9017,7 @@ complete registration using methods from the <code>ModuleApi</code>.</p>
<h3 id="default-saml-mapping-provider"><a class="header" href="#default-saml-mapping-provider">Default SAML Mapping Provider</a></h3>
<p>Synapse has a built-in SAML mapping provider if a custom provider isn't
specified in the config. It is located at
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/handlers/saml.py"><code>synapse.handlers.saml.DefaultSamlMappingProvider</code></a>.</p>
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/handlers/saml.py"><code>synapse.handlers.saml.DefaultSamlMappingProvider</code></a>.</p>
<div style="break-before: page; page-break-before: always;"></div><h2 style="color:red">
This page of the Synapse documentation is now deprecated. For up to date
documentation on setting up or writing a password auth provider module, please see
@ -9477,7 +9477,7 @@ database and shows a success page.</p>
<p>To enable this, first create templates for the policy and success pages.
These should be stored on the local filesystem.</p>
<p>These templates use the <a href="http://jinja.pocoo.org">Jinja2</a> templating language,
and <a href="https://github.com/element.-hq/synapse/tree/develop/docs/privacy_policy_templates/">docs/privacy_policy_templates</a>
and <a href="https://github.com/element-hq/synapse/tree/develop/docs/privacy_policy_templates/">docs/privacy_policy_templates</a>
gives examples of the sort of thing that can be done.</p>
<p>Note that the templates must be stored under a name giving the language of the
template - currently this must always be <code>en</code> (for &quot;English&quot;);
@ -9958,7 +9958,7 @@ the <code>synapse.module_api.ModuleApi</code> class. The configuration is a dict
either the output of the module's <code>parse_config</code> static method (see below), or the
configuration associated with the module in Synapse's configuration file.</p>
<p>See the documentation for the <code>ModuleApi</code> class
<a href="https://github.com/element.-hq/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
<a href="https://github.com/element-hq/synapse/blob/master/synapse/module_api/__init__.py">here</a>.</p>
<h2 id="when-synapse-runs-with-several-modules-configured"><a class="header" href="#when-synapse-runs-with-several-modules-configured">When Synapse runs with several modules configured</a></h2>
<p>If Synapse is running with other modules configured, the order each module appears in
within the <code>modules</code> section of the Synapse configuration file might restrict what it can
@ -11983,9 +11983,9 @@ managing workers. It provides a <code>matrix-synapse</code> service for the mast
well as a <code>matrix-synapse-worker@</code> service template for any workers you
require. Additionally, to group the required services, it sets up a
<code>matrix-synapse.target</code>.</p>
<p>See the folder <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
<p>See the folder <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
for the systemd unit files.</p>
<p>The folder <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/workers/">workers</a>
<p>The folder <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/workers/">workers</a>
contains an example configuration for the <code>generic_worker</code> worker.</p>
<h2 id="synapse-configuration-files"><a class="header" href="#synapse-configuration-files">Synapse configuration files</a></h2>
<p>See <a href="systemd-with-workers/../workers.html">the worker documentation</a> for information on how to set up the
@ -12012,7 +12012,7 @@ the provided <code>*.service</code> files accordingly.</p>
<h2 id="set-up"><a class="header" href="#set-up">Set up</a></h2>
<ol>
<li>Adjust synapse configuration files as above.</li>
<li>Copy the <code>*.service</code> and <code>*.target</code> files in <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
<li>Copy the <code>*.service</code> and <code>*.target</code> files in <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
to <code>/etc/systemd/system</code>.</li>
<li>Run <code>systemctl daemon-reload</code> to tell systemd to load the new unit files.</li>
<li>Run <code>systemctl enable matrix-synapse.service</code>. This will configure the
@ -12047,7 +12047,7 @@ systemctl restart matrix-synapse.target
<h2 id="hardening"><a class="header" href="#hardening">Hardening</a></h2>
<p><strong>Optional:</strong> If further hardening is desired, the file
<code>override-hardened.conf</code> may be copied from
<a href="https://github.com/element.-hq/synapse/tree/develop/contrib/systemd/">contrib/systemd/override-hardened.conf</a>
<a href="https://github.com/element-hq/synapse/tree/develop/contrib/systemd/">contrib/systemd/override-hardened.conf</a>
in this repository to the location
<code>/etc/systemd/system/matrix-synapse.service.d/override-hardened.conf</code> (the
directory may have to be created). It enables certain sandboxing features in
@ -15608,8 +15608,8 @@ the listener port configured with the <code>metrics</code> resource.</p>
<p>Restart Prometheus.</p>
</li>
<li>
<p>Consider using the <a href="https://github.com/element.-hq/synapse/tree/master/contrib/grafana/">grafana dashboard</a>
and required <a href="https://github.com/element.-hq/synapse/tree/master/contrib/prometheus/">recording rules</a></p>
<p>Consider using the <a href="https://github.com/element-hq/synapse/tree/master/contrib/grafana/">grafana dashboard</a>
and required <a href="https://github.com/element-hq/synapse/tree/master/contrib/prometheus/">recording rules</a></p>
</li>
</ol>
<h2 id="monitoring-workers"><a class="header" href="#monitoring-workers">Monitoring workers</a></h2>
@ -15938,11 +15938,11 @@ registered accounts on the homeserver.</p>
<p>It is possible to monitor much of the internal state of Synapse using <a href="https://prometheus.io">Prometheus</a>
metrics and <a href="https://grafana.com/">Grafana</a>.
A guide for configuring Synapse to provide metrics is available <a href="usage/administration/../../metrics-howto.html">here</a>
and information on setting up Grafana is <a href="https://github.com/element.-hq/synapse/tree/master/contrib/grafana">here</a>.
and information on setting up Grafana is <a href="https://github.com/element-hq/synapse/tree/master/contrib/grafana">here</a>.
In this setup, Prometheus will periodically scrape the information Synapse provides and
store a record of it over time. Grafana is then used as an interface to query and
present this information through a series of pretty graphs.</p>
<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/element.-hq/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p>
<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/element-hq/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p>
<h2 id="message-event-send-time"><a class="header" href="#message-event-send-time">Message Event Send Time</a></h2>
<p><img src="https://user-images.githubusercontent.com/1342360/82239409-a1c8e900-9930-11ea-8081-e4614e0c63f4.png" alt="image" /></p>
<p>This, along with the CPU and Memory graphs, is a good way to check the general health of your Synapse instance. It represents how long it takes for a user on your homeserver to send a message.</p>
@ -15969,7 +15969,7 @@ present this information through a series of pretty graphs.</p>
<p>This is quite a useful graph. It shows how many times Synapse attempts to retrieve a piece of data from a cache which the cache did not contain, thus resulting in a call to the database. We can see here that the <code>_get_joined_profile_from_event_id</code> cache is being requested a lot, and often the data we're after is not cached.</p>
<p>Cross-referencing this with the Eviction Rate graph, which shows that entries are being evicted from <code>_get_joined_profile_from_event_id</code> quite often:</p>
<p><img src="https://user-images.githubusercontent.com/1342360/82240766-de95df80-9932-11ea-8c15-5acfc57c48da.png" alt="image" /></p>
<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/element.-hq/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p>
<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/element-hq/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p>
<h2 id="forward-extremities"><a class="header" href="#forward-extremities">Forward Extremities</a></h2>
<p><img src="https://user-images.githubusercontent.com/1342360/82241440-13566680-9934-11ea-8b88-ba468db937ed.png" alt="image" /></p>
<p>Forward extremities are the leaf events at the end of a DAG in a room, aka events that have no children. The more that exist in a room, the more <a href="https://spec.matrix.org/v1.1/server-server-api/#room-state-resolution">state resolution</a> that Synapse needs to perform (hint: it's an expensive operation). While Synapse has code to prevent too many of these existing at one time in a room, bugs can sometimes make them crop up again.</p>
@ -16180,7 +16180,7 @@ WHERE room_stats_state.room_id = event_json.room_id&quot; | psql -d synapse -h l
<h2 id="compression-tool"><a class="header" href="#compression-tool">Compression tool</a></h2>
<p>There is a tool at https://github.com/matrix-org/rust-synapse-compress-state which can compress the <code>state_groups_state</code> on a room by-room basis (essentially, it reduces the number of &quot;full&quot; state groups). This can result in dramatic reductions of the storage used.</p>
<div style="break-before: page; page-break-before: always;"></div><h1 id="request-log-format"><a class="header" href="#request-log-format">Request log format</a></h1>
<p>HTTP request logs are written by synapse (see <a href="https://github.com/element.-hq/synapse/tree/develop/synapse/http/site.py"><code>synapse/http/site.py</code></a> for details).</p>
<p>HTTP request logs are written by synapse (see <a href="https://github.com/element-hq/synapse/tree/develop/synapse/http/site.py"><code>synapse/http/site.py</code></a> for details).</p>
<p>See the following for how to decode the dense data available from the default logging configuration.</p>
<pre><code>2020-10-01 12:00:00,000 - synapse.access.http.8008 - 311 - INFO - PUT-1000- 192.168.0.1 - 8008 - {another-matrix-server.com} Processed request: 0.100sec/-0.000sec (0.000sec, 0.000sec) (0.001sec/0.090sec/3) 11B !200 &quot;PUT /_matrix/federation/v1/send/1600000000000 HTTP/1.1&quot; &quot;Synapse/1.20.1&quot; [0 dbevts]
-AAAAAAAAAAAAAAAAAAAAA- -BBBBBBBBBBBBBBBBBBBBBB- -C- -DD- -EEEEEE- -FFFFFFFFF- -GG- -HHHHHHHHHHHHHHHHHHHHHHH- -IIIIII- -JJJJJJJ- -KKKKKK-, -LLLLLL- -MMMMMMM- -NNNNNN- O -P- -QQ- -RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR- -SSSSSSSSSSSS- -TTTTTT-
@ -17065,10 +17065,10 @@ before. Here, by way of an arbitrary example, is the top of <code>git log --grap
<p>Note how the commit comment explains clearly what is changing and why. Also
note the <em>absence</em> of merge commits, as well as the absence of commits called
things like (to pick a few culprits):
<a href="https://github.com/element.-hq/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/element.-hq/synapse/commit/474810d9d">“fix broken
<a href="https://github.com/element-hq/synapse/commit/84691da6c">“pep8”</a>, <a href="https://github.com/element-hq/synapse/commit/474810d9d">“fix broken
test”</a>,
<a href="https://github.com/element.-hq/synapse/commit/c9d72e457">“oops”</a>,
<a href="https://github.com/element.-hq/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/element.-hq/synapse/commit/707374d5d">“Who's
<a href="https://github.com/element-hq/synapse/commit/c9d72e457">“oops”</a>,
<a href="https://github.com/element-hq/synapse/commit/836358823">“typo”</a>, or <a href="https://github.com/element-hq/synapse/commit/707374d5d">“Who's
the president?”</a>.</p>
<p>There are a number of reasons why keeping a clean commit history is a good
thing:</p>
@ -18544,7 +18544,7 @@ minimal.</p>
the classes interact, can be found in
<code>synapse/replication/tcp/__init__.py</code></p>
<div style="break-before: page; page-break-before: always;"></div><h2 id="streams"><a class="header" href="#streams">Streams</a></h2>
<p>Synapse has a concept of &quot;streams&quot;, which are roughly described in <a href="https://github.com/element.-hq/synapse/blob/develop/synapse/storage/util/id_generators.py"><code>id_generators.py</code></a>.
<p>Synapse has a concept of &quot;streams&quot;, which are roughly described in <a href="https://github.com/element-hq/synapse/blob/develop/synapse/storage/util/id_generators.py"><code>id_generators.py</code></a>.
Generally speaking, streams are a series of notifications that something in Synapse's database has changed that the application might need to respond to.
For example:</p>
<ul>
@ -18552,9 +18552,9 @@ For example:</p>
<li>The account data stream reports changes to users' <a href="https://spec.matrix.org/v1.7/client-server-api/#client-config">account data</a>.</li>
<li>The to-device stream reports when a device has a new <a href="https://spec.matrix.org/v1.7/client-server-api/#send-to-device-messaging">to-device message</a>.</li>
</ul>
<p>See <a href="https://github.com/element.-hq/synapse/blob/develop/synapse/replication/tcp/streams/__init__.py"><code>synapse.replication.tcp.streams</code></a> for the full list of streams.</p>
<p>See <a href="https://github.com/element-hq/synapse/blob/develop/synapse/replication/tcp/streams/__init__.py"><code>synapse.replication.tcp.streams</code></a> for the full list of streams.</p>
<p>It is very helpful to understand the streams mechanism when working on any part of Synapse that needs to respond to changes—especially if those changes are made by different workers.
To that end, let's describe streams formally, paraphrasing from the docstring of <a href="https://github.com/element.-hq/synapse/blob/a719b703d9bd0dade2565ddcad0e2f3a7a9d4c37/synapse/storage/util/id_generators.py#L96"><code>AbstractStreamIdGenerator</code></a>.</p>
To that end, let's describe streams formally, paraphrasing from the docstring of <a href="https://github.com/element-hq/synapse/blob/a719b703d9bd0dade2565ddcad0e2f3a7a9d4c37/synapse/storage/util/id_generators.py#L96"><code>AbstractStreamIdGenerator</code></a>.</p>
<h3 id="definition"><a class="header" href="#definition">Definition</a></h3>
<p>A stream is an append-only log <code>T1, T2, ..., Tn, ...</code> of facts<sup class="footnote-reference"><a href="#1">1</a></sup> which grows over time.
Only &quot;writers&quot; can add facts to a stream, and there may be multiple writers.</p>

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@ -300,7 +300,7 @@ usually returned as part of the <a href="https://spec.matrix.org/latest/client-s
<h3 id="default-openid-mapping-provider"><a class="header" href="#default-openid-mapping-provider">Default OpenID Mapping Provider</a></h3>
<p>Synapse has a built-in OpenID mapping provider if a custom provider isn't
specified in the config. It is located at
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/handlers/oidc.py"><code>synapse.handlers.oidc.JinjaOidcMappingProvider</code></a>.</p>
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/handlers/oidc.py"><code>synapse.handlers.oidc.JinjaOidcMappingProvider</code></a>.</p>
<h2 id="saml-mapping-providers"><a class="header" href="#saml-mapping-providers">SAML Mapping Providers</a></h2>
<p>The SAML mapping provider can be customized by editing the
<a href="usage/configuration/config_documentation.html#saml2_config"><code>saml2_config.user_mapping_provider.module</code></a>
@ -415,7 +415,7 @@ complete registration using methods from the <code>ModuleApi</code>.</p>
<h3 id="default-saml-mapping-provider"><a class="header" href="#default-saml-mapping-provider">Default SAML Mapping Provider</a></h3>
<p>Synapse has a built-in SAML mapping provider if a custom provider isn't
specified in the config. It is located at
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/handlers/saml.py"><code>synapse.handlers.saml.DefaultSamlMappingProvider</code></a>.</p>
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/handlers/saml.py"><code>synapse.handlers.saml.DefaultSamlMappingProvider</code></a>.</p>
</main>

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@ -165,9 +165,9 @@ managing workers. It provides a <code>matrix-synapse</code> service for the mast
well as a <code>matrix-synapse-worker@</code> service template for any workers you
require. Additionally, to group the required services, it sets up a
<code>matrix-synapse.target</code>.</p>
<p>See the folder <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
<p>See the folder <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
for the systemd unit files.</p>
<p>The folder <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/workers/">workers</a>
<p>The folder <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/workers/">workers</a>
contains an example configuration for the <code>generic_worker</code> worker.</p>
<h2 id="synapse-configuration-files"><a class="header" href="#synapse-configuration-files">Synapse configuration files</a></h2>
<p>See <a href="../workers.html">the worker documentation</a> for information on how to set up the
@ -194,7 +194,7 @@ the provided <code>*.service</code> files accordingly.</p>
<h2 id="set-up"><a class="header" href="#set-up">Set up</a></h2>
<ol>
<li>Adjust synapse configuration files as above.</li>
<li>Copy the <code>*.service</code> and <code>*.target</code> files in <a href="https://github.com/element.-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
<li>Copy the <code>*.service</code> and <code>*.target</code> files in <a href="https://github.com/element-hq/synapse/tree/develop/docs/systemd-with-workers/system/">system</a>
to <code>/etc/systemd/system</code>.</li>
<li>Run <code>systemctl daemon-reload</code> to tell systemd to load the new unit files.</li>
<li>Run <code>systemctl enable matrix-synapse.service</code>. This will configure the
@ -229,7 +229,7 @@ systemctl restart matrix-synapse.target
<h2 id="hardening"><a class="header" href="#hardening">Hardening</a></h2>
<p><strong>Optional:</strong> If further hardening is desired, the file
<code>override-hardened.conf</code> may be copied from
<a href="https://github.com/element.-hq/synapse/tree/develop/contrib/systemd/">contrib/systemd/override-hardened.conf</a>
<a href="https://github.com/element-hq/synapse/tree/develop/contrib/systemd/">contrib/systemd/override-hardened.conf</a>
in this repository to the location
<code>/etc/systemd/system/matrix-synapse.service.d/override-hardened.conf</code> (the
directory may have to be created). It enables certain sandboxing features in

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@ -162,7 +162,7 @@
<h1 id="templates"><a class="header" href="#templates">Templates</a></h1>
<p>Synapse uses parametrised templates to generate the content of emails it sends and
webpages it shows to users.</p>
<p>By default, Synapse will use the templates listed <a href="https://github.com/element.-hq/synapse/tree/master/synapse/res/templates">here</a>.
<p>By default, Synapse will use the templates listed <a href="https://github.com/element-hq/synapse/tree/master/synapse/res/templates">here</a>.
Server admins can configure an additional directory for Synapse to look for templates
in, allowing them to specify custom templates:</p>
<pre><code class="language-yaml">templates:

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@ -955,7 +955,7 @@ becomes stable.</p>
<p>As announced with the release of <a href="#deprecation-of-the-user_may_create_room_with_invites-module-callback">Synapse 1.47.0</a>,
the deprecated <code>user_may_create_room_with_invites</code> module callback has been removed.</p>
<p>Modules relying on it can instead implement <a href="https://element-hq.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
and use the <a href="https://github.com/element.-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
and use the <a href="https://github.com/element-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
module API to infer whether the invite is happening while creating a room (see <a href="https://github.com/matrix-org/synapse-domain-rule-checker/blob/e7d092dd9f2a7f844928771dbfd9fd24c2332e48/synapse_domain_rule_checker/__init__.py#L56-L89">this function</a>
as an example). Alternately, modules can also implement <a href="https://element-hq.github.io/synapse/latest/modules/third_party_rules_callbacks.html#on_create_room"><code>on_create_room</code></a>.</p>
<h1 id="upgrading-to-v1520"><a class="header" href="#upgrading-to-v1520">Upgrading to v1.52.0</a></h1>
@ -992,7 +992,7 @@ longer supported upstream.</p>
<p>The <code>user_may_create_room_with_invites</code> is deprecated and will be removed in a future
version of Synapse. Modules implementing this callback can instead implement
<a href="https://element-hq.github.io/synapse/latest/modules/spam_checker_callbacks.html#user_may_invite"><code>user_may_invite</code></a>
and use the <a href="https://github.com/element.-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
and use the <a href="https://github.com/element-hq/synapse/blob/872f23b95fa980a61b0866c1475e84491991fa20/synapse/module_api/__init__.py#L869-L876"><code>get_room_state</code></a>
module API method to infer whether the invite is happening in the context of creating a
room.</p>
<p>We plan to remove this callback in January 2022.</p>
@ -1025,8 +1025,8 @@ federation requests.</p>
<a href="https://element-hq.github.io/synapse/latest/admin_api/rooms.html#delete-room-api">Delete Room API</a>.</p>
<h2 id="user-interactive-authentication-fallback-templates-can-now-display-errors"><a class="header" href="#user-interactive-authentication-fallback-templates-can-now-display-errors">User-interactive authentication fallback templates can now display errors</a></h2>
<p>This may affect you if you make use of custom HTML templates for the
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates/recaptcha.html">reCAPTCHA (<code>synapse/res/templates/recaptcha.html</code>)</a> or
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates/terms.html">terms (<code>synapse/res/templates/terms.html</code>)</a> fallback pages.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates/recaptcha.html">reCAPTCHA (<code>synapse/res/templates/recaptcha.html</code>)</a> or
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates/terms.html">terms (<code>synapse/res/templates/terms.html</code>)</a> fallback pages.</p>
<p>The template is now provided an <code>error</code> variable if the authentication
process failed. See the default templates linked above for an example.</p>
<h2 id="removal-of-out-of-date-email-pushers"><a class="header" href="#removal-of-out-of-date-email-pushers">Removal of out-of-date email pushers</a></h2>
@ -1410,7 +1410,7 @@ endpoint can be handled</p>
update your reverse proxy configuration to reflect this change.</p>
<h2 id="new-html-templates"><a class="header" href="#new-html-templates">New HTML templates</a></h2>
<p>A new HTML template,
<a href="https://github.com/element.-hq/synapse/blob/develop/synapse/res/templates/password_reset_confirmation.html">password_reset_confirmation.html</a>,
<a href="https://github.com/element-hq/synapse/blob/develop/synapse/res/templates/password_reset_confirmation.html">password_reset_confirmation.html</a>,
has been added to the <code>synapse/res/templates</code> directory. If you are
using a custom template directory, you may want to copy the template
over and modify it.</p>
@ -1490,7 +1490,7 @@ INSERT INTO background_updates (update_name, progress_json, depends_on) VALUES
is configured to use SSO and a custom
<code>sso_redirect_confirm_template_dir</code> configuration then these templates
will need to be copied from
<a href="https://github.com/element.-hq/synapse/tree/develop/synapse/res/templates"><code>synapse/res/templates</code></a> into that directory.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/synapse/res/templates"><code>synapse/res/templates</code></a> into that directory.</p>
<h2 id="synapse-sso-plugins-method-deprecation"><a class="header" href="#synapse-sso-plugins-method-deprecation">Synapse SSO Plugins Method Deprecation</a></h2>
<p>Plugins using the <code>complete_sso_login</code> method of
<code>synapse.module_api.ModuleApi</code> should update to using the async/await
@ -1621,7 +1621,7 @@ included.</p>
<p>Synapse will expect these files to exist inside the configured template
directory, and <strong>will fail to start</strong> if they are absent. To view the
default templates, see
<a href="https://github.com/element.-hq/synapse/tree/master/synapse/res/templates">synapse/res/templates</a>.</p>
<a href="https://github.com/element-hq/synapse/tree/master/synapse/res/templates">synapse/res/templates</a>.</p>
<h2 id="3pid-verification-changes"><a class="header" href="#3pid-verification-changes">3pid verification changes</a></h2>
<p><strong>Note: As of this release, users will be unable to add phone numbers or
email addresses to their accounts, without changes to the Synapse

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@ -160,7 +160,7 @@
</div>
<h1 id="request-log-format"><a class="header" href="#request-log-format">Request log format</a></h1>
<p>HTTP request logs are written by synapse (see <a href="https://github.com/element.-hq/synapse/tree/develop/synapse/http/site.py"><code>synapse/http/site.py</code></a> for details).</p>
<p>HTTP request logs are written by synapse (see <a href="https://github.com/element-hq/synapse/tree/develop/synapse/http/site.py"><code>synapse/http/site.py</code></a> for details).</p>
<p>See the following for how to decode the dense data available from the default logging configuration.</p>
<pre><code>2020-10-01 12:00:00,000 - synapse.access.http.8008 - 311 - INFO - PUT-1000- 192.168.0.1 - 8008 - {another-matrix-server.com} Processed request: 0.100sec/-0.000sec (0.000sec, 0.000sec) (0.001sec/0.090sec/3) 11B !200 &quot;PUT /_matrix/federation/v1/send/1600000000000 HTTP/1.1&quot; &quot;Synapse/1.20.1&quot; [0 dbevts]
-AAAAAAAAAAAAAAAAAAAAA- -BBBBBBBBBBBBBBBBBBBBBB- -C- -DD- -EEEEEE- -FFFFFFFFF- -GG- -HHHHHHHHHHHHHHHHHHHHHHH- -IIIIII- -JJJJJJJ- -KKKKKK-, -LLLLLL- -MMMMMMM- -NNNNNN- O -P- -QQ- -RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR- -SSSSSSSSSSSS- -TTTTTT-

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@ -163,11 +163,11 @@
<p>It is possible to monitor much of the internal state of Synapse using <a href="https://prometheus.io">Prometheus</a>
metrics and <a href="https://grafana.com/">Grafana</a>.
A guide for configuring Synapse to provide metrics is available <a href="../../metrics-howto.html">here</a>
and information on setting up Grafana is <a href="https://github.com/element.-hq/synapse/tree/master/contrib/grafana">here</a>.
and information on setting up Grafana is <a href="https://github.com/element-hq/synapse/tree/master/contrib/grafana">here</a>.
In this setup, Prometheus will periodically scrape the information Synapse provides and
store a record of it over time. Grafana is then used as an interface to query and
present this information through a series of pretty graphs.</p>
<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/element.-hq/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p>
<p>Once you have grafana set up, and assuming you're using <a href="https://github.com/element-hq/synapse/blob/master/contrib/grafana/synapse.json">our grafana dashboard template</a>, look for the following graphs when debugging a slow/overloaded Synapse:</p>
<h2 id="message-event-send-time"><a class="header" href="#message-event-send-time">Message Event Send Time</a></h2>
<p><img src="https://user-images.githubusercontent.com/1342360/82239409-a1c8e900-9930-11ea-8081-e4614e0c63f4.png" alt="image" /></p>
<p>This, along with the CPU and Memory graphs, is a good way to check the general health of your Synapse instance. It represents how long it takes for a user on your homeserver to send a message.</p>
@ -194,7 +194,7 @@ present this information through a series of pretty graphs.</p>
<p>This is quite a useful graph. It shows how many times Synapse attempts to retrieve a piece of data from a cache which the cache did not contain, thus resulting in a call to the database. We can see here that the <code>_get_joined_profile_from_event_id</code> cache is being requested a lot, and often the data we're after is not cached.</p>
<p>Cross-referencing this with the Eviction Rate graph, which shows that entries are being evicted from <code>_get_joined_profile_from_event_id</code> quite often:</p>
<p><img src="https://user-images.githubusercontent.com/1342360/82240766-de95df80-9932-11ea-8c15-5acfc57c48da.png" alt="image" /></p>
<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/element.-hq/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p>
<p>we should probably consider raising the size of that cache by raising its cache factor (a multiplier value for the size of an individual cache). Information on doing so is available <a href="https://github.com/element-hq/synapse/blob/ee421e524478c1ad8d43741c27379499c2f6135c/docs/sample_config.yaml#L608-L642">here</a> (note that the configuration of individual cache factors through the configuration file is available in Synapse v1.14.0+, whereas doing so through environment variables has been supported for a very long time). Note that this will increase Synapse's overall memory usage.</p>
<h2 id="forward-extremities"><a class="header" href="#forward-extremities">Forward Extremities</a></h2>
<p><img src="https://user-images.githubusercontent.com/1342360/82241440-13566680-9934-11ea-8b88-ba468db937ed.png" alt="image" /></p>
<p>Forward extremities are the leaf events at the end of a DAG in a room, aka events that have no children. The more that exist in a room, the more <a href="https://spec.matrix.org/v1.1/server-server-api/#room-state-resolution">state resolution</a> that Synapse needs to perform (hint: it's an expensive operation). While Synapse has code to prevent too many of these existing at one time in a room, bugs can sometimes make them crop up again.</p>

2
develop/usage/configuration/config_documentation.html
View file

@ -1367,7 +1367,7 @@ caches:
</code></pre>
<p>If you are running multiple workers, you must individually update the worker
config file and send this signal to each worker process.</p>
<p>If you're using the <a href="https://github.com/element.-hq/synapse/blob/develop/contrib/systemd/matrix-synapse.service">example systemd service</a>
<p>If you're using the <a href="https://github.com/element-hq/synapse/blob/develop/contrib/systemd/matrix-synapse.service">example systemd service</a>
file in Synapse's <code>contrib</code> directory, you can send a <code>SIGHUP</code> signal by using
<code>systemctl reload matrix-synapse</code>.</p>
<hr />

8
develop/welcome_and_overview.html
View file

@ -200,7 +200,7 @@ following documentation:</p>
<li>
<p>Read the <a href="development/contributing_guide.html">Contributing Guide</a>. It is meant
to walk new contributors through the process of developing and submitting a
change to the Synapse codebase (which is <a href="https://github.com/element.-hq/synapse">hosted on
change to the Synapse codebase (which is <a href="https://github.com/element-hq/synapse">hosted on
GitHub</a>).</p>
</li>
<li>
@ -210,9 +210,9 @@ how to <a href="development/contributing_guide.html#run-the-linters">lint</a> an
<a href="development/contributing_guide.html#8-test-test-test">test</a> your code.</p>
</li>
<li>
<p>Look at <a href="https://github.com/element.-hq/synapse/issues">the issue tracker</a> for
<p>Look at <a href="https://github.com/element-hq/synapse/issues">the issue tracker</a> for
bugs to fix or features to add. If you're new, it may be best to start with
those labeled <a href="https://github.com/element.-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
those labeled <a href="https://github.com/element-hq/synapse/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22">good first
issue</a>.</p>
</li>
<li>
@ -228,7 +228,7 @@ do so!</p>
</li>
<li>
<p>And finally, contribute to this documentation! The source for which is
<a href="https://github.com/element.-hq/synapse/tree/develop/docs">located here</a>.</p>
<a href="https://github.com/element-hq/synapse/tree/develop/docs">located here</a>.</p>
</li>
</ul>
<h2 id="reporting-a-security-vulnerability"><a class="header" href="#reporting-a-security-vulnerability">Reporting a security vulnerability</a></h2>