apex-app-archetype/src/main/resources/archetype-resources/src/main/resources/META-INF/properties.xml

<?xml version="1.0"?>
<configuration>
  <!-- 
  <property>
    <name>apex.application.{appName}.operator.{opName}.prop.{propName}</name>
    <value>some-default-value (if value is not specified, it is required from the user or custom config when launching)</value>
  </property>
  -->
  <!-- memory assigned to app master
  <property>
    <name>apex.attr.MASTER_MEMORY_MB</name>
    <value>1024</value>
  </property>
  -->
  <property>
    <name>apex.application.MyFirstApplication.operator.randomGenerator.prop.numTuples</name>
    <value>1000</value>
  </property>
  <property>
    <name>apex.application.MyFirstApplication.operator.console.prop.stringFormat</name>
    <value>hello world: %s</value>
  </property>
</configuration>