Merge pull request #1042 from matrix-org/erikj/preserve_log_contexts

synapse/appservice/scheduler.py

synapse/crypto/keyring.py

synapse/federation/federation_base.py

synapse/federation/federation_client.py

synapse/handlers/appservice.py

synapse/handlers/federation.py

synapse/handlers/message.py

synapse/handlers/typing.py

synapse/notifier.py

synapse/push/push_tools.py

synapse/push/pusherpool.py

synapse/rest/client/v2_alpha/register.py

synapse/storage/events.py

synapse/storage/stream.py

synapse/util/async.py

synapse/util/logcontext.py

synapse/visibility.py