if (
  saashq-a
    envs:
      RABBITMQ_HOST-X
  and
  saashq-b
    envs:
      RABBITMQ_HOST-X
)
then
  saashq-a
    envs:
      RABBITMQ_HOST-X
      MESSAGE_BROKER_PREFIX-a

  saashq-b
    envs:
      RABBITMQ_HOST-X
      MESSAGE_BROKER_PREFIX-b
else
  MESSAGE_BROKER_PREFIX -- undefined (not must)
endif