After some discussion with the community it was decided to
clean the configuration file from excessive comments and
explicitly configured default values. Also, mod_mam and
mod_http_upload have been added.
The rationale for this is to have a clean and not bloated
configuration file which doesn't scare away newcomers and
which has all features from the Compliance Suite 2018 (XEP-0387)
enabled by default.
For further configuration an admin is encouraged to read the
documentation at https://docs.ejabberd.im/admin/configuration
When building the certificates chains, if several certificates
are found matching the same domain their validity is checked:
* the invalid one is ignored and the valid one is picked
* if both are valid or both are invalid, then the one with
sooner expiration is ignored.
Fixes#2454
Also, SASL mechanisms chaining is now supported:
if several mechanisms are supported and authentication
fails, next mechanism in the list is picked, until the
list is exhausted. In the case of a failure, the latest
SASL failure reason is returned within handle_auth_failure/3
callback.
This error condition is defined within stream errors, however,
XEP-0198 says:
> This element SHOULD contain an error condition, which MUST
> be one of the **stanza** error conditions defined in RFC 6120.
* oom_watermark: 1..100
Start OOM watchdog only when system memory usage exceeds
this value in percents. When the usage drops below the value,
OOM watchdog is stopped. The default is 80 (percents).
Note that once OOM watchdog is started, it performs full garbage
collection periodically: this can be seen as spikes in CPU
utilization and drops in RAM usage. If your system is permanently
above the watermark, it may cause significant CPU overhead.
* oom_queue: positive integer
Only trigger OOM killer when total amount of messages in all queues
of all Erlang processes is above this value. The default is 10000.
Note that this value only takes effect when `oom_killer` is set
to `true` (this is the default). Otherwise, only a warning will
be logged.
