Enabling logging and metrics for nodes

Hello,

  1. I have been going through http://druid.io/docs/latest/configuration/logging.html for enabling logging in druid. How do i store logs to a local file with retention policy for the last 7 days ?. Also how do we enable it and do i need to specify the properties in common.runtime.properties or in the individual node properties ?
  2. How do i store the metrics to a local mount log file with a retention policy of 7 days ?
    Thanks !