metadata/service/log_collector/single.yml

applications:
- heka
classes:
- service.heka.support
parameters:
  _param:
    log_collector_poolsize: 100
    log_collector_max_message_size: 262144
  heka:
    log_collector:
      enabled: true
      poolsize: ${_param:log_collector_poolsize}
      max_message_size: ${_param:log_collector_max_message_size}