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Update documentation on retention policies limits (#8529) 

* Update documentation on retention policies limits

Document the changes from https://github.com/matrix-org/synapse/pull/8104
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Brendan Abolivier 2020-10-14 15:00:49 +01:00 committed by GitHub
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Document the new behaviour of the `allowed_lifetime_min` and `allowed_lifetime_max` settings in the room retention configuration.

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docs/message_retention_policies.md
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### Lifetime limits
**Note: this feature is mainly useful within a closed federation or on
servers that don't federate, because there currently is no way to
enforce these limits in an open federation.**
Server admins can restrict the values their local users are allowed to
use for both `min_lifetime` and `max_lifetime`. These limits can be
defined as such in the `retention` section of the configuration file:
Server admins can set limits on the values of `max_lifetime` to use when
purging old events in a room. These limits can be defined as such in the
`retention` section of the configuration file:
```yaml
allowed_lifetime_min: 1d
allowed_lifetime_max: 1y
```
Here, `allowed_lifetime_min` is the lowest value a local user can set
for both `min_lifetime` and `max_lifetime`, and `allowed_lifetime_max`
is the highest value. Both parameters are optional (e.g. setting
`allowed_lifetime_min` but not `allowed_lifetime_max` only enforces a
minimum and no maximum).
The limits are considered when running purge jobs. If necessary, the
effective value of `max_lifetime` will be brought between
`allowed_lifetime_min` and `allowed_lifetime_max` (inclusive).
This means that, if the value of `max_lifetime` defined in the room's state
is lower than `allowed_lifetime_min`, the value of `allowed_lifetime_min`
will be used instead. Likewise, if the value of `max_lifetime` is higher
than `allowed_lifetime_max`, the value of `allowed_lifetime_max` will be
used instead.
In the example above, we ensure Synapse never deletes events that are less
than one day old, and that it always deletes events that are over a year
old.
If a default policy is set, and its `max_lifetime` value is lower than
`allowed_lifetime_min` or higher than `allowed_lifetime_max`, the same
process applies.
Both parameters are optional; if one is omitted Synapse won't use it to
adjust the effective value of `max_lifetime`.
Like other settings in this section, these parameters can be expressed
either as a duration or as a number of milliseconds.