title: Youtube API V3: Total comments count [Videos]
body: <p>I want to get all video comments of a channel. At the moment I'm proceeding like this:</p>
  
  <p>1.) Getting all video ids of a channel (1 quota)
  2.) Sending new request with "part: statistics" and getting the total comment count to a youtube video (2 Quota)</p>
  
  <p>It's polling in 30 seconds intervall and I wanted to reduce the quota. Therefore is there a possibility to query whether there are any new comments for a channel videos (Total amount of comments for a channel including channel comments would be fine too)? Like saving the old value of total amount of comments and comparing it with the new amount of the query?</p>