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Co-authored-by: Brendan Abolivier <babolivier@matrix.org>
Co-authored-by: Richard van der Hoff <richard@matrix.org>

Co-authored-by: Brendan Abolivier <babolivier@matrix.org>
Co-authored-by: Richard van der Hoff <richard@matrix.org>

To not change the behaviour during the deprecation period.

Follow-up to #11774.

#11595 dropped support for python 3.6, but forgot to update this doc.

This changes the behaviour of the root endpoint to redirect
directly to the configuration of `web_client_location` if it is
given an HTTP(S) URL.

Debug for #8631.

I'm having a hard time tracking down what's going wrong in that issue.
In the reported example, I could see server A sending federation traffic
to server B and all was well. Yet B reports out-of-sync device updates
from A.

I couldn't see what was _in_ the events being sent from A to B. So I
have added some crude logging to track

- when we have updates to send to a remote HS
- the edus we actually accumulate to send
- when a federation transaction includes a device list update edu
- when such an EDU is received

This is a bit of a sledgehammer.

Updates complement.sh to read the ref from an environment
variable (defaulting to master) when downloading a complement
bundle for testing.

`FederationClient.get_room_hierarchy()` caches its return values, so
refactor the code to avoid modifying the returned room summary.

A couple of surprises for me here, so thought I'd document them

By scraping Open Graph information from the HTML even
when an autodiscovery endpoint is found. The results are
then combined to capture as much information as possible
from the page.

Per updates to MSC3440.

This is implement as a separate method since it needs to be cached
on a per-user basis, instead of a per-thread basis.

I've never found this terribly useful. I think it was added in the early days
of Synapse, without much thought as to what would actually be useful to log,
and has just been cargo-culted ever since.

Rather, it tends to clutter up debug logs with useless information.

Add a flag to the `synapse_review_recent_signups` script to ignore and filter appservice users. (#11675)

* Warn against using Let's Encrypt certs for encrypted TURN

This helps to avoid client-side issues:
* https://github.com/vector-im/element-android/issues/1533
* https://github.com/vector-im/element-ios/issues/2712

Signed-off-by: Andrew Ferrazzutti <fair@miscworks.net>