deploy: b977867358

develop/print.html

@@ -1652,6 +1652,13 @@ working email server in the <code>email</code> configuration section (including,
 minimum, a <code>notif_from</code> setting.)</p>
 <p>Specifying an <code>email</code> setting under <code>account_threepid_delegates</code> will now cause
 an error at startup.</p>
+<h2 id="changes-to-the-event-replication-streams"><a class="header" href="#changes-to-the-event-replication-streams">Changes to the event replication streams</a></h2>
+<p>Synapse now includes a flag indicating if an event is an outlier when
+replicating it to other workers. This is a forwards- and backwards-incompatible
+change: v1.63 and workers cannot process events replicated by v1.64 workers, and
+vice versa.</p>
+<p>Once all workers are upgraded to v1.64 (or downgraded to v1.63), event
+replication will resume as normal.</p>
 <h1 id="upgrading-to-v1620"><a class="header" href="#upgrading-to-v1620">Upgrading to v1.62.0</a></h1>
 <h2 id="new-signatures-for-spam-checker-callbacks"><a class="header" href="#new-signatures-for-spam-checker-callbacks">New signatures for spam checker callbacks</a></h2>
 <p>As a followup to changes in v1.60.0, the following spam-checker callbacks have changed signature:</p>
@@ -4399,6 +4406,19 @@ can be more computationally expensive than restricting locally). Defaults to
     burst_count: 12
 </code></pre>
 <hr />
+<h3 id="rc_joins_per_room"><a class="header" href="#rc_joins_per_room"><code>rc_joins_per_room</code></a></h3>
+<p>This option allows admins to ratelimit joins to a room based on the number of recent
+joins (local or remote) to that room. It is intended to mitigate mass-join spam
+waves which target multiple homeservers.</p>
+<p>By default, one join is permitted to a room every second, with an accumulating
+buffer of up to ten instantaneous joins.</p>
+<p>Example configuration (default values):</p>
+<pre><code class="language-yaml">rc_joins_per_room:
+  per_second: 1
+  burst_count: 10
+</code></pre>
+<p><em>Added in Synapse 1.64.0.</em></p>
+<hr />
 <h3 id="rc_3pid_validation"><a class="header" href="#rc_3pid_validation"><code>rc_3pid_validation</code></a></h3>
 <p>This option ratelimits how often a user or IP can attempt to validate a 3PID.
 Defaults to <code>per_second: 0.003</code>, <code>burst_count: 5</code>.</p>

develop/searchindex.js

@@ -1 +1 @@
-Object.assign(window.search, {"doc_urls":["welcome_and_overview.html#introduction","welcome_and_overview.html#installing-and-using-synapse","welcome_and_overview.html#developing-on-synapse","welcome_and_overview.html#donating-to-synapse-development","welcome_and_overview.html#reporting-a-security-vulnerability","setup/installation.html#installation-instructions","setup/installation.html#choosing-your-server-name","setup/installation.html#installing-synapse","setup/installation.html#prebuilt-packages","setup/installation.html#installing-as-a-python-module-from-pypi","setup/installation.html#setting-up-synapse","setup/installation.html#using-postgresql","setup/installation.html#tls-certificates","setup/installation.html#client-well-known-uri","setup/installation.html#email","setup/installation.html#registering-a-user","setup/installation.html#setting-up-a-turn-server","setup/installation.html#url-previews","setup/installation.html#troubleshooting-installation","postgres.html#using-postgres","postgres.html#install-postgres-client-libraries","postgres.html#set-up-database","postgres.html#synapse-config","postgres.html#tuning-postgres","postgres.html#porting-from-sqlite","postgres.html#overview","postgres.html#using-the-port-script","postgres.html#troubleshooting","postgres.html#alternative-auth-methods","postgres.html#fixing-incorrect-collate-or-ctype","postgres.html#fixing-inconsistent-sequences-error","reverse_proxy.html#using-a-reverse-proxy-with-synapse","reverse_proxy.html#homeserver-configuration","reverse_proxy.html#reverse-proxy-configuration-examples","reverse_proxy.html#nginx","reverse_proxy.html#caddy-v1","reverse_proxy.html#caddy-v2","reverse_proxy.html#apache","reverse_proxy.html#haproxy","reverse_proxy.html#relayd","reverse_proxy.html#health-check-endpoint","reverse_proxy.html#synapse-administration-endpoints","setup/forward_proxy.html#using-a-forward-proxy-with-synapse","setup/forward_proxy.html#configure","setup/forward_proxy.html#connection-types","setup/forward_proxy.html#troubleshooting","turn-howto.html#overview","turn-howto.html#requirements","turn-howto.html#coturn-setup","turn-howto.html#initial-installation","turn-howto.html#configuration","turn-howto.html#synapse-setup","turn-howto.html#troubleshooting","delegate.html#delegation-of-incoming-federation-traffic","delegate.html#well-known-delegation","delegate.html#external-server","delegate.html#serving-a-well-knownmatrixserver-file-with-synapse","delegate.html#srv-dns-record-delegation","delegate.html#delegation-faq","delegate.html#when-do-i-need-delegation","delegate.html#should-i-use-a-reverse-proxy-for-federation-traffic","upgrade.html#upgrading-synapse","upgrade.html#rolling-back-to-older-versions","upgrade.html#upgrading-to-v1640","upgrade.html#delegation-of-email-validation-no-longer-supported","upgrade.html#upgrading-to-v1620","upgrade.html#new-signatures-for-spam-checker-callbacks","upgrade.html#upgrading-to-v1610","upgrade.html#removal-of-deprecated-communitygroups","upgrade.html#worker-endpoints","upgrade.html#upgrading-to-v1600","upgrade.html#adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted","upgrade.html#on-postgres","upgrade.html#on-sqlite","upgrade.html#for-more-details","upgrade.html#new-signature-for-the-spam-checker-callback-check_event_for_spam","upgrade.html#upgrading-to-v1590","upgrade.html#device-name-lookup-over-federation-has-been-disabled-by-default","upgrade.html#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types","upgrade.html#upgrading-to-v1580","upgrade.html#groupscommunities-feature-has-been-disabled-by-default","upgrade.html#upgrading-to-v1570","upgrade.html#changes-to-database-schema-for-application-services","upgrade.html#upgrading-to-v1560","upgrade.html#open-registration-without-verification-is-now-disabled-by-default","upgrade.html#groupscommunities-feature-has-been-deprecated","upgrade.html#change-in-behaviour-for-postgresql-databases-with-unsafe-locale","upgrade.html#upgrading-to-v1550","upgrade.html#synctl-script-has-been-moved","upgrade.html#compatibility-dropped-for-mjolnir-131-and-earlier","upgrade.html#upgrading-to-v1540","upgrade.html#legacy-structured-logging-configuration-removal","upgrade.html#upgrading-to-v1530","upgrade.html#dropping-support-for-webclient-listeners-and-non-https-web_client_location","upgrade.html#stablisation-of-msc3231","upgrade.html#time-based-cache-expiry-is-now-enabled-by-default","upgrade.html#deprecation-of-capability-orgmatrixmsc3283","upgrade.html#removal-of-user_may_create_room_with_invites","upgrade.html#upgrading-to-v1520","upgrade.html#twisted-security-release","upgrade.html#upgrading-to-v1510","upgrade.html#deprecation-of-webclient-listeners-and-non-https-web_client_location","upgrade.html#upgrading-to-v1500","upgrade.html#dropping-support-for-old-python-and-postgres-versions","upgrade.html#upgrading-to-v1470","upgrade.html#removal-of-old-room-admin-api","upgrade.html#deprecation-of-thLine truncated
+Object.assign(window.search, {"doc_urls":["welcome_and_overview.html#introduction","welcome_and_overview.html#installing-and-using-synapse","welcome_and_overview.html#developing-on-synapse","welcome_and_overview.html#donating-to-synapse-development","welcome_and_overview.html#reporting-a-security-vulnerability","setup/installation.html#installation-instructions","setup/installation.html#choosing-your-server-name","setup/installation.html#installing-synapse","setup/installation.html#prebuilt-packages","setup/installation.html#installing-as-a-python-module-from-pypi","setup/installation.html#setting-up-synapse","setup/installation.html#using-postgresql","setup/installation.html#tls-certificates","setup/installation.html#client-well-known-uri","setup/installation.html#email","setup/installation.html#registering-a-user","setup/installation.html#setting-up-a-turn-server","setup/installation.html#url-previews","setup/installation.html#troubleshooting-installation","postgres.html#using-postgres","postgres.html#install-postgres-client-libraries","postgres.html#set-up-database","postgres.html#synapse-config","postgres.html#tuning-postgres","postgres.html#porting-from-sqlite","postgres.html#overview","postgres.html#using-the-port-script","postgres.html#troubleshooting","postgres.html#alternative-auth-methods","postgres.html#fixing-incorrect-collate-or-ctype","postgres.html#fixing-inconsistent-sequences-error","reverse_proxy.html#using-a-reverse-proxy-with-synapse","reverse_proxy.html#homeserver-configuration","reverse_proxy.html#reverse-proxy-configuration-examples","reverse_proxy.html#nginx","reverse_proxy.html#caddy-v1","reverse_proxy.html#caddy-v2","reverse_proxy.html#apache","reverse_proxy.html#haproxy","reverse_proxy.html#relayd","reverse_proxy.html#health-check-endpoint","reverse_proxy.html#synapse-administration-endpoints","setup/forward_proxy.html#using-a-forward-proxy-with-synapse","setup/forward_proxy.html#configure","setup/forward_proxy.html#connection-types","setup/forward_proxy.html#troubleshooting","turn-howto.html#overview","turn-howto.html#requirements","turn-howto.html#coturn-setup","turn-howto.html#initial-installation","turn-howto.html#configuration","turn-howto.html#synapse-setup","turn-howto.html#troubleshooting","delegate.html#delegation-of-incoming-federation-traffic","delegate.html#well-known-delegation","delegate.html#external-server","delegate.html#serving-a-well-knownmatrixserver-file-with-synapse","delegate.html#srv-dns-record-delegation","delegate.html#delegation-faq","delegate.html#when-do-i-need-delegation","delegate.html#should-i-use-a-reverse-proxy-for-federation-traffic","upgrade.html#upgrading-synapse","upgrade.html#rolling-back-to-older-versions","upgrade.html#upgrading-to-v1640","upgrade.html#delegation-of-email-validation-no-longer-supported","upgrade.html#changes-to-the-event-replication-streams","upgrade.html#upgrading-to-v1620","upgrade.html#new-signatures-for-spam-checker-callbacks","upgrade.html#upgrading-to-v1610","upgrade.html#removal-of-deprecated-communitygroups","upgrade.html#worker-endpoints","upgrade.html#upgrading-to-v1600","upgrade.html#adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted","upgrade.html#on-postgres","upgrade.html#on-sqlite","upgrade.html#for-more-details","upgrade.html#new-signature-for-the-spam-checker-callback-check_event_for_spam","upgrade.html#upgrading-to-v1590","upgrade.html#device-name-lookup-over-federation-has-been-disabled-by-default","upgrade.html#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types","upgrade.html#upgrading-to-v1580","upgrade.html#groupscommunities-feature-has-been-disabled-by-default","upgrade.html#upgrading-to-v1570","upgrade.html#changes-to-database-schema-for-application-services","upgrade.html#upgrading-to-v1560","upgrade.html#open-registration-without-verification-is-now-disabled-by-default","upgrade.html#groupscommunities-feature-has-been-deprecated","upgrade.html#change-in-behaviour-for-postgresql-databases-with-unsafe-locale","upgrade.html#upgrading-to-v1550","upgrade.html#synctl-script-has-been-moved","upgrade.html#compatibility-dropped-for-mjolnir-131-and-earlier","upgrade.html#upgrading-to-v1540","upgrade.html#legacy-structured-logging-configuration-removal","upgrade.html#upgrading-to-v1530","upgrade.html#dropping-support-for-webclient-listeners-and-non-https-web_client_location","upgrade.html#stablisation-of-msc3231","upgrade.html#time-based-cache-expiry-is-now-enabled-by-default","upgrade.html#deprecation-of-capability-orgmatrixmsc3283","upgrade.html#removal-of-user_may_create_room_with_invites","upgrade.html#upgrading-to-v1520","upgrade.html#twisted-security-release","upgrade.html#upgrading-to-v1510","upgrade.html#deprecation-of-webclient-listeners-and-non-https-web_client_location","upgrade.html#upgrading-to-v1500","upgrade.html#dropping-support-for-old-python-and-postgres-versions","upgrade.html#upgrading-to-v1470","upgrade.html#removaLine truncated

develop/searchindex.json

@@ -1 +1 @@
-{"doc_urls":["welcome_and_overview.html#introduction","welcome_and_overview.html#installing-and-using-synapse","welcome_and_overview.html#developing-on-synapse","welcome_and_overview.html#donating-to-synapse-development","welcome_and_overview.html#reporting-a-security-vulnerability","setup/installation.html#installation-instructions","setup/installation.html#choosing-your-server-name","setup/installation.html#installing-synapse","setup/installation.html#prebuilt-packages","setup/installation.html#installing-as-a-python-module-from-pypi","setup/installation.html#setting-up-synapse","setup/installation.html#using-postgresql","setup/installation.html#tls-certificates","setup/installation.html#client-well-known-uri","setup/installation.html#email","setup/installation.html#registering-a-user","setup/installation.html#setting-up-a-turn-server","setup/installation.html#url-previews","setup/installation.html#troubleshooting-installation","postgres.html#using-postgres","postgres.html#install-postgres-client-libraries","postgres.html#set-up-database","postgres.html#synapse-config","postgres.html#tuning-postgres","postgres.html#porting-from-sqlite","postgres.html#overview","postgres.html#using-the-port-script","postgres.html#troubleshooting","postgres.html#alternative-auth-methods","postgres.html#fixing-incorrect-collate-or-ctype","postgres.html#fixing-inconsistent-sequences-error","reverse_proxy.html#using-a-reverse-proxy-with-synapse","reverse_proxy.html#homeserver-configuration","reverse_proxy.html#reverse-proxy-configuration-examples","reverse_proxy.html#nginx","reverse_proxy.html#caddy-v1","reverse_proxy.html#caddy-v2","reverse_proxy.html#apache","reverse_proxy.html#haproxy","reverse_proxy.html#relayd","reverse_proxy.html#health-check-endpoint","reverse_proxy.html#synapse-administration-endpoints","setup/forward_proxy.html#using-a-forward-proxy-with-synapse","setup/forward_proxy.html#configure","setup/forward_proxy.html#connection-types","setup/forward_proxy.html#troubleshooting","turn-howto.html#overview","turn-howto.html#requirements","turn-howto.html#coturn-setup","turn-howto.html#initial-installation","turn-howto.html#configuration","turn-howto.html#synapse-setup","turn-howto.html#troubleshooting","delegate.html#delegation-of-incoming-federation-traffic","delegate.html#well-known-delegation","delegate.html#external-server","delegate.html#serving-a-well-knownmatrixserver-file-with-synapse","delegate.html#srv-dns-record-delegation","delegate.html#delegation-faq","delegate.html#when-do-i-need-delegation","delegate.html#should-i-use-a-reverse-proxy-for-federation-traffic","upgrade.html#upgrading-synapse","upgrade.html#rolling-back-to-older-versions","upgrade.html#upgrading-to-v1640","upgrade.html#delegation-of-email-validation-no-longer-supported","upgrade.html#upgrading-to-v1620","upgrade.html#new-signatures-for-spam-checker-callbacks","upgrade.html#upgrading-to-v1610","upgrade.html#removal-of-deprecated-communitygroups","upgrade.html#worker-endpoints","upgrade.html#upgrading-to-v1600","upgrade.html#adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted","upgrade.html#on-postgres","upgrade.html#on-sqlite","upgrade.html#for-more-details","upgrade.html#new-signature-for-the-spam-checker-callback-check_event_for_spam","upgrade.html#upgrading-to-v1590","upgrade.html#device-name-lookup-over-federation-has-been-disabled-by-default","upgrade.html#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types","upgrade.html#upgrading-to-v1580","upgrade.html#groupscommunities-feature-has-been-disabled-by-default","upgrade.html#upgrading-to-v1570","upgrade.html#changes-to-database-schema-for-application-services","upgrade.html#upgrading-to-v1560","upgrade.html#open-registration-without-verification-is-now-disabled-by-default","upgrade.html#groupscommunities-feature-has-been-deprecated","upgrade.html#change-in-behaviour-for-postgresql-databases-with-unsafe-locale","upgrade.html#upgrading-to-v1550","upgrade.html#synctl-script-has-been-moved","upgrade.html#compatibility-dropped-for-mjolnir-131-and-earlier","upgrade.html#upgrading-to-v1540","upgrade.html#legacy-structured-logging-configuration-removal","upgrade.html#upgrading-to-v1530","upgrade.html#dropping-support-for-webclient-listeners-and-non-https-web_client_location","upgrade.html#stablisation-of-msc3231","upgrade.html#time-based-cache-expiry-is-now-enabled-by-default","upgrade.html#deprecation-of-capability-orgmatrixmsc3283","upgrade.html#removal-of-user_may_create_room_with_invites","upgrade.html#upgrading-to-v1520","upgrade.html#twisted-security-release","upgrade.html#upgrading-to-v1510","upgrade.html#deprecation-of-webclient-listeners-and-non-https-web_client_location","upgrade.html#upgrading-to-v1500","upgrade.html#dropping-support-for-old-python-and-postgres-versions","upgrade.html#upgrading-to-v1470","upgrade.html#removal-of-old-room-admin-api","upgrade.html#deprecation-of-the-user_may_create_room_with_iLine truncated
+{"doc_urls":["welcome_and_overview.html#introduction","welcome_and_overview.html#installing-and-using-synapse","welcome_and_overview.html#developing-on-synapse","welcome_and_overview.html#donating-to-synapse-development","welcome_and_overview.html#reporting-a-security-vulnerability","setup/installation.html#installation-instructions","setup/installation.html#choosing-your-server-name","setup/installation.html#installing-synapse","setup/installation.html#prebuilt-packages","setup/installation.html#installing-as-a-python-module-from-pypi","setup/installation.html#setting-up-synapse","setup/installation.html#using-postgresql","setup/installation.html#tls-certificates","setup/installation.html#client-well-known-uri","setup/installation.html#email","setup/installation.html#registering-a-user","setup/installation.html#setting-up-a-turn-server","setup/installation.html#url-previews","setup/installation.html#troubleshooting-installation","postgres.html#using-postgres","postgres.html#install-postgres-client-libraries","postgres.html#set-up-database","postgres.html#synapse-config","postgres.html#tuning-postgres","postgres.html#porting-from-sqlite","postgres.html#overview","postgres.html#using-the-port-script","postgres.html#troubleshooting","postgres.html#alternative-auth-methods","postgres.html#fixing-incorrect-collate-or-ctype","postgres.html#fixing-inconsistent-sequences-error","reverse_proxy.html#using-a-reverse-proxy-with-synapse","reverse_proxy.html#homeserver-configuration","reverse_proxy.html#reverse-proxy-configuration-examples","reverse_proxy.html#nginx","reverse_proxy.html#caddy-v1","reverse_proxy.html#caddy-v2","reverse_proxy.html#apache","reverse_proxy.html#haproxy","reverse_proxy.html#relayd","reverse_proxy.html#health-check-endpoint","reverse_proxy.html#synapse-administration-endpoints","setup/forward_proxy.html#using-a-forward-proxy-with-synapse","setup/forward_proxy.html#configure","setup/forward_proxy.html#connection-types","setup/forward_proxy.html#troubleshooting","turn-howto.html#overview","turn-howto.html#requirements","turn-howto.html#coturn-setup","turn-howto.html#initial-installation","turn-howto.html#configuration","turn-howto.html#synapse-setup","turn-howto.html#troubleshooting","delegate.html#delegation-of-incoming-federation-traffic","delegate.html#well-known-delegation","delegate.html#external-server","delegate.html#serving-a-well-knownmatrixserver-file-with-synapse","delegate.html#srv-dns-record-delegation","delegate.html#delegation-faq","delegate.html#when-do-i-need-delegation","delegate.html#should-i-use-a-reverse-proxy-for-federation-traffic","upgrade.html#upgrading-synapse","upgrade.html#rolling-back-to-older-versions","upgrade.html#upgrading-to-v1640","upgrade.html#delegation-of-email-validation-no-longer-supported","upgrade.html#changes-to-the-event-replication-streams","upgrade.html#upgrading-to-v1620","upgrade.html#new-signatures-for-spam-checker-callbacks","upgrade.html#upgrading-to-v1610","upgrade.html#removal-of-deprecated-communitygroups","upgrade.html#worker-endpoints","upgrade.html#upgrading-to-v1600","upgrade.html#adding-a-new-unique-index-to-state_group_edges-could-fail-if-your-database-is-corrupted","upgrade.html#on-postgres","upgrade.html#on-sqlite","upgrade.html#for-more-details","upgrade.html#new-signature-for-the-spam-checker-callback-check_event_for_spam","upgrade.html#upgrading-to-v1590","upgrade.html#device-name-lookup-over-federation-has-been-disabled-by-default","upgrade.html#deprecation-of-the-synapseappappservice-and-synapseappuser_dir-worker-application-types","upgrade.html#upgrading-to-v1580","upgrade.html#groupscommunities-feature-has-been-disabled-by-default","upgrade.html#upgrading-to-v1570","upgrade.html#changes-to-database-schema-for-application-services","upgrade.html#upgrading-to-v1560","upgrade.html#open-registration-without-verification-is-now-disabled-by-default","upgrade.html#groupscommunities-feature-has-been-deprecated","upgrade.html#change-in-behaviour-for-postgresql-databases-with-unsafe-locale","upgrade.html#upgrading-to-v1550","upgrade.html#synctl-script-has-been-moved","upgrade.html#compatibility-dropped-for-mjolnir-131-and-earlier","upgrade.html#upgrading-to-v1540","upgrade.html#legacy-structured-logging-configuration-removal","upgrade.html#upgrading-to-v1530","upgrade.html#dropping-support-for-webclient-listeners-and-non-https-web_client_location","upgrade.html#stablisation-of-msc3231","upgrade.html#time-based-cache-expiry-is-now-enabled-by-default","upgrade.html#deprecation-of-capability-orgmatrixmsc3283","upgrade.html#removal-of-user_may_create_room_with_invites","upgrade.html#upgrading-to-v1520","upgrade.html#twisted-security-release","upgrade.html#upgrading-to-v1510","upgrade.html#deprecation-of-webclient-listeners-and-non-https-web_client_location","upgrade.html#upgrading-to-v1500","upgrade.html#dropping-support-for-old-python-and-postgres-versions","upgrade.html#upgrading-to-v1470","upgrade.html#removal-of-old-room-admin-api","upgLine truncated

develop/upgrade.html

@@ -242,6 +242,13 @@ working email server in the <code>email</code> configuration section (including,
 minimum, a <code>notif_from</code> setting.)</p>
 <p>Specifying an <code>email</code> setting under <code>account_threepid_delegates</code> will now cause
 an error at startup.</p>
+<h2 id="changes-to-the-event-replication-streams"><a class="header" href="#changes-to-the-event-replication-streams">Changes to the event replication streams</a></h2>
+<p>Synapse now includes a flag indicating if an event is an outlier when
+replicating it to other workers. This is a forwards- and backwards-incompatible
+change: v1.63 and workers cannot process events replicated by v1.64 workers, and
+vice versa.</p>
+<p>Once all workers are upgraded to v1.64 (or downgraded to v1.63), event
+replication will resume as normal.</p>
 <h1 id="upgrading-to-v1620"><a class="header" href="#upgrading-to-v1620">Upgrading to v1.62.0</a></h1>
 <h2 id="new-signatures-for-spam-checker-callbacks"><a class="header" href="#new-signatures-for-spam-checker-callbacks">New signatures for spam checker callbacks</a></h2>
 <p>As a followup to changes in v1.60.0, the following spam-checker callbacks have changed signature:</p>

develop/usage/configuration/config_documentation.html

@@ -1378,6 +1378,19 @@ can be more computationally expensive than restricting locally). Defaults to
     burst_count: 12
 </code></pre>
 <hr />
+<h3 id="rc_joins_per_room"><a class="header" href="#rc_joins_per_room"><code>rc_joins_per_room</code></a></h3>
+<p>This option allows admins to ratelimit joins to a room based on the number of recent
+joins (local or remote) to that room. It is intended to mitigate mass-join spam
+waves which target multiple homeservers.</p>
+<p>By default, one join is permitted to a room every second, with an accumulating
+buffer of up to ten instantaneous joins.</p>
+<p>Example configuration (default values):</p>
+<pre><code class="language-yaml">rc_joins_per_room:
+  per_second: 1
+  burst_count: 10
+</code></pre>
+<p><em>Added in Synapse 1.64.0.</em></p>
+<hr />
 <h3 id="rc_3pid_validation"><a class="header" href="#rc_3pid_validation"><code>rc_3pid_validation</code></a></h3>
 <p>This option ratelimits how often a user or IP can attempt to validate a 3PID.
 Defaults to <code>per_second: 0.003</code>, <code>burst_count: 5</code>.</p>