Extra properties for druid bi cluster

extra_properties.json

[
    {
      "druid-common": {
        "properties": {
          "druid.metadata.storage.type":"postgresql",
          "druid.metadata.storage.connector.connectURI": "jdbc:postgresql://YOUR_RDS.us-west-2.rds.amazonaws.com:5432/YOUR_DBNAME",
          "druid.metadata.storage.connector.user": "YOUR_USER",
          "druid.metadata.storage.connector.password": "YOUR_DB_PASSWORD",
          "druid.extensions.loadList": "[\"postgresql-metadata-storage\", \"druid-s3-extensions\"]"
        }
      },
      "druid-router":{
        "properties":{
          "druid.router.tierToBrokerMap": "{\"_default_tier\": \"druid/broker\"}"
        }
      }
    }
  ]