title: Run the task on localhost only once
body: <p>I have a playbook which will be run on many servers (say 10). The first three tasks will be run on the remote servers. The last task of merging is done on the localhost(ansible server)
  when I run this playbook, each time (10 times) the merging is happening. I want to do the merging task only one time,once all the above task is completed on all servers. Kindly advise.</p>
  
  <pre><code>---
  - name: Find the location 
    ....  
  - name: Extract details
    ....  
  - name: Create csv file
    ....
  - name: Merge files
    ....
    delegate_to: localhost 
  </code></pre>