The rk processor plugin replaces an event routing key with a new one, depending on a current value.
Configuration
[[processors]]
# "mapping" is a "new key -> old keys" map
# event routing key will be replaced with a new value
# if current key matches one in a list
[processors.rk.mapping]
"events.topic.0" = [ "/http", "input.queue" ]
"events.topic.1" = [ "/push" ]