Merge branch 'release-v0.26.0' of github.com:matrix-org/synapse

CHANGES.rst

contrib/prometheus/README

contrib/prometheus/synapse-v1.rules

contrib/prometheus/synapse-v2.rules

docs/log_contexts.rst

docs/workers.rst

scripts-dev/federation_client.py

scripts/sync_room_to_group.pl

synapse/__init__.py

synapse/api/auth.py

synapse/api/errors.py

synapse/app/homeserver.py

synapse/app/media_repository.py

synapse/app/synchrotron.py

synapse/appservice/__init__.py

synapse/config/appservice.py

synapse/config/homeserver.py

synapse/config/push.py

synapse/config/server.py

synapse/config/user_directory.py