Add some documentation around the `rc_invites` option to the config docs (#12759)

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Andrew Morgan 2022-05-18 12:21:32 +01:00 committed by GitHub
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Add information regarding the `rc_invites` ratelimiting option to the configuration docs.

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@ -1357,6 +1357,20 @@ This option sets ratelimiting how often invites can be sent in a room or to a
specific user. `per_room` defaults to `per_second: 0.3`, `burst_count: 10` and
`per_user` defaults to `per_second: 0.003`, `burst_count: 5`.
Client requests that invite user(s) when [creating a
room](https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3createroom)
will count against the `rc_invites.per_room` limit, whereas
client requests to [invite a single user to a
room](https://spec.matrix.org/v1.2/client-server-api/#post_matrixclientv3roomsroomidinvite)
will count against both the `rc_invites.per_user` and `rc_invites.per_room` limits.
Federation requests to invite a user will count against the `rc_invites.per_user`
limit only, as Synapse presumes ratelimiting by room will be done by the sending server.
The `rc_invites.per_user` limit applies to the *receiver* of the invite, rather than the
sender, meaning that a `rc_invite.per_user.burst_count` of 5 mandates that a single user
cannot *receive* more than a burst of 5 invites at a time.
Example configuration:
```yaml
rc_invites: