title: Redis commands queue size
body: <p>How to log/measure the size of Redis command's queue.</p>
  
  <p>The Redis is single-threaded, so it runs commands sequentially, as I guess there is command queue there, where the incoming commands are stored, and executed one by one. The SLOWLOG command only shows the execution time, so the question is, is there a way to get how long the command was in queue before starting of execution.</p>