Co-Authored-By: Richard van der Hoff <1389908+richvdh@users.noreply.github.com>

put the 2nd part of the "source installation"-section into a new section, because it also applies to Debian packages

* Remove sections of federate.md explaining delegation at time of Synapse 1.0 transition

Signed-off-by: Aaron Raimist <aaron@raim.ist>

* Add changelog

Signed-off-by: Aaron Raimist <aaron@raim.ist>

When we have an event which refers to non-existent auth_events, ignore said events rather than exploding in a ball of fire.

Fixes #6605.

TODO: automate generation of this

s/reverse_proxy.rst/reverse_proxy.md/

s/reverse_proxy.rst/reverse_proxy.md/

Synapse 1.7.2 (2019-12-20)
==========================

This release fixes some regressions introduced in Synapse 1.7.0 and 1.7.1.

Bugfixes
--------

- Fix a regression introduced in Synapse 1.7.1 which caused errors when attempting to backfill rooms over federation. ([\#6576](https://github.com/matrix-org/synapse/issues/6576))
- Fix a bug introduced in Synapse 1.7.0 which caused an error on startup when upgrading from versions before 1.3.0. ([\#6578](https://github.com/matrix-org/synapse/issues/6578))

Only run prepare_database on connection for in-memory databases.

Fixes #6569.

Fixes #6575

`Failed to upgrade database` is not helpful, and it's unlikely that UPGRADE.rst
has anything useful.

If acme was enabled, the sdnotify startup hook would never be run because we
would try to add it to a hook which had already fired.

There's no need to delay it: we can sdnotify as soon as we've started the
listeners.

I want to do some key rotation, and it is silly that we don't have a way to do
this.

* Remove redundant python2 support code

`str.decode()` doesn't exist on python3, so presumably this code was doing
nothing

* Filter out pushers with corrupt data

When we get a row with unparsable json, drop the row, rather than returning a
row with null `data`, which will then cause an explosion later on.

* Improve logging when we can't start a pusher

Log the ID to help us understand the problem

* Make email pusher setup more robust

We know we'll have a `data` member, since that comes from the database. What we
*don't* know is if that is a dict, and if that has a `brand` member, and if
that member is a string.

This encapsulates config for a given database and is the way to get new
connections.

Synapse 1.7.1 (2019-12-18)
==========================

This release includes several security fixes as well as a fix to a bug exposed by the security fixes. Administrators are encouraged to upgrade as soon as possible.

Security updates
----------------

- Fix a bug which could cause room events to be incorrectly authorized using events from a different room. ([\#6501](https://github.com/matrix-org/synapse/issues/6501), [\#6503](https://github.com/matrix-org/synapse/issues/6503), [\#6521](https://github.com/matrix-org/synapse/issues/6521), [\#6524](https://github.com/matrix-org/synapse/issues/6524), [\#6530](https://github.com/matrix-org/synapse/issues/6530), [\#6531](https://github.com/matrix-org/synapse/issues/6531))
- Fix a bug causing responses to the `/context` client endpoint to not use the pruned version of the event. ([\#6553](https://github.com/matrix-org/synapse/issues/6553))
- Fix a cause of state resets in room versions 2 onwards. ([\#6556](https://github.com/matrix-org/synapse/issues/6556), [\#6560](https://github.com/matrix-org/synapse/issues/6560))

Bugfixes
--------

- Fix a bug which could cause the federation server to incorrectly return errors when handling certain obscure event graphs. ([\#6526](https://github.com/matrix-org/synapse/issues/6526), [\#6527](https://github.com/matrix-org/synapse/issues/6527))

Remove unused get_pagination_rows methods

Previously we tried to be clever and filter out some unnecessary event
IDs to keep the auth chain small, but that had some annoying
interactions with state res v2 so we stop doing that for now.

Previously we tried to be clever and filter out some unnecessary event
IDs to keep the auth chain small, but that had some annoying
interactions with state res v2 so we stop doing that for now.

 Use the filtered version of an event when responding to /context requests for that event

Merge branch 'babolivier/fix-context-filter' of github.com:matrix-org/synapse into babolivier/fix-context-filter