title: How does 'Poll SCM' Jenkins feature know the repository and branch over which polling?
body: <p>I am configuring a legacy Jenkins which has installed the SCM Poll plugin with Git and Gerrit plugins.
  Due to something I cannot comprehend, even if I have no branch or specific project configured anywhere for my git server nor in my job, I can clearly see how my job is handling the correct repository (Git Polling Log works flawlessly) and other projects don't trigger it. </p>
  
  <p>Is that configured in a very hidden place? Does it work executing git on the workspace without knowing context? </p>
  
  <p>I cannot see any SCM configuration tab in my Jenkins or either Fast Remote Polling or other features Im seeing appointed to in Internet, but I am using pipeline scripts, so maybe that feature is disabled, or maybe my git/gerrit plugin is infering the context somehow. </p>
  
  <p>In the same section "Build Trigger", for instance, I have the Gerrit Event option disabled, and if I select the checkbox, then it asks me for a repository url and usual stuff </p>