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Make the presence state-machine timers configurable (#19942)

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Adds `last_active_granularity`, `sync_online_timeout` and `idle_timeout`
options to the `presence` config section, controlling the previously
hard-coded `LAST_ACTIVE_GRANULARITY`, `SYNC_ONLINE_TIMEOUT` and
`IDLE_TIMER` constants (which remain as the defaults).

This is mainly useful on deployments that ratelimit how often syncs can
affect presence (`rc_presence`): the sync timeout must exceed the
ratelimit interval or users flap offline between syncs, so tuning down
presence traffic currently requires squeezing under the fixed 30s limit.

---------

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Erik Johnston
2026-07-09 17:21:50 +01:00
committed by GitHub
co-authored by Claude Fable 5
parent 365df86536
commit 3f3edaf029
6 changed files with 401 additions and 63 deletions
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docs/usage/configuration/config_documentation.md
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@@ -284,6 +284,24 @@ This setting has the following sub-options:
* `include_offline_users_on_sync` (boolean): When clients perform an initial or `full_state` sync, presence results for offline users are not included by default. Setting `include_offline_users_on_sync` to `true` will always include offline users in the results. Defaults to `false`.
* `last_active_granularity` (duration): How long after a user was last active that they are still shown as "currently active" to other users. Larger values reduce the rate of presence updates sent to other users and servers.
*Added in Synapse 1.156.0.*
Defaults to `"1m"`.
* `sync_online_timeout` (duration): How long after a client's last sync request their presence is switched to offline. Clients are expected to keep a sync request open at (almost) all times while online, so this only needs to cover the gap between two consecutive sync requests. Note that if `rc_presence` is set to ratelimit how often syncs can affect presence, this must be greater than the ratelimit's interval or users will incorrectly be marked as offline in between syncs.
*Added in Synapse 1.156.0.*
Defaults to `"30s"`.
* `idle_timeout` (duration): How long after a user was last active that their presence is switched to "unavailable" (idle) while they remain connected. Must be greater than `last_active_granularity`.
*Added in Synapse 1.156.0.*
Defaults to `"5m"`.
Example configuration:
```yaml
presence: