title: How to disable all service integrations of one kind
body: <p>I have added a slack service template to my gitlab-ce via the administrators interface. Everything worked. I activated "active by default".
  As a result, <em>all</em> projects now push notifications into the main channel. And those are a <em>lot</em>. </p>
  
  <p>Changing the service template configuration is not inherit by the projects. Thus effectively rendering me unable to revert the setting via the admin UI.</p>
  
  <p>So, how can I disable the slack service integrations for all projects before it drives all of us crazy because the general-channel is just flooded by gitlab?</p>