Magento 2 – Use Same Event in Multiple Modules

i strongly recommend to set this observer as a tool to trace possible hooks when working in creating new observer for any specific event

How to Know The Magento Event that We Want to Hook

thus i have created in the module Logevent the config.xml

     <?xml version="1.0" encoding="UTF-8"?>

<modules>
    <Maticode_Logevent>
        <version>0.1</version>
    </Maticode_Logevent>
</modules>


<global>
    <models>
        <Logevent>
            <class>Maticode_Logevent_Model</class>
        </Logevent>
    </models>

    <events>


        <controller_action_predispatch>
            <observers>
                <Logevent>
                    <type>singleton</type>
                    <class>Logevent/observer</class>
                    <method>controller_action_predispatch</method>
                </Logevent>
            </observers>
        </controller_action_predispatch>

    </events>
</global>

and the Model/observer.php

            <?php

 class Maticode_Logevent_Model_Observer {
public function controller_action_predispatch($observer) {
    Mage::log ( $observer->getEvent ()->getControllerAction ()->getFullActionName (),null, 'eventlog.log' );
}
  }

This way , in the

        var/log/eventlog.log file  

i can visualize a possible hook on any tested actions

You can use customer_logout event to do that below is sample code write the code in your config.xml

   <events>
   <customer_logout>
        <observers>
            <Namespace_Module_Model_Observer>
                <type>singleton</type>
                <class>Namespace_Module_Model_Observer</class>
                <method>CustomerLogout</method>
            </Namespace_Module_Model_Observer>
        </observers>
    </customer_logout>
   </events>