Each instance of the application has a service ID, whose value can be set with
spring.cloud.bus.id and whose value is expected to be a colon-separated list of
identifiers, in order from least specific to most specific. The default value is
constructed from the environment as a combination of the spring.application.name and
server.port (or spring.application.index, if set). The default value of the ID is
constructed in the form of app:index:id, where:
app is the vcap.application.name, if it exists, or spring.application.nameindex is the vcap.application.instance_index, if it exists,
spring.application.index, local.server.port, server.port, or 0 (in that order).id is the vcap.application.instance_id, if it exists, or a random value.The HTTP endpoints accept a “destination” path parameter, such as
/bus-refresh/customers:9000, where destination is a service ID. If the ID
is owned by an instance on the bus, it processes the message, and all other instances
ignore it.