Add controls for influencing Matrix Synapse's rate-limiting

roles/matrix-server/defaults/main.yml

@@ -61,6 +61,10 @@ matrix_synapse_max_upload_size_mb: 10
 matrix_synapse_max_log_file_size_mb: 100
 matrix_synapse_max_log_files_count: 10
 
+# Rate limits
+matrix_synapse_rc_messages_per_second: 0.2
+matrix_synapse_rc_message_burst_count: 10.0
+
 # A list of additional "volumes" to mount in the container.
 # This list gets populated dynamically based on Synapse extensions that have been enabled.
 # Contains definition objects like this: `{"src": "/outside", "dst": "/inside", "options": "rw|ro|slave|.."}

roles/matrix-server/templates/synapse/homeserver.yaml.j2

@@ -197,10 +197,10 @@ log_config: "/data/{{ hostname_matrix }}.log.config"
 ## Ratelimiting ##
 
 # Number of messages a client can send per second
-rc_messages_per_second: 0.2
+rc_messages_per_second: {{ matrix_synapse_rc_messages_per_second }}
 
 # Number of message a client can send before being throttled
-rc_message_burst_count: 10.0
+rc_message_burst_count: {{ matrix_synapse_rc_message_burst_count }}
 
 # The federation window size in milliseconds
 federation_rc_window_size: 1000