title: What is number of 'command' operations reported by mongostat?
body: <p>I am monitoring my database performance using the mongostat tool. The tool is reporting data every second. The output shows the following data </p>
  
  <pre><code>insert query update delete getmore command
    2063  3101   2062   1027       0  4131|0
    2103  3192   2105   1056       0  4239|0
  </code></pre>
  
  <p>The mongostat documentation says, commands:</p>
  
  <pre><code>command
    The number of commands per second. On secondary systems, mongostat 
    presents two values separated by a pipe character (e.g. |), in the form of
    local|replicated commands.
  </code></pre>
  
  <p>From MongoDb point of view, what is a 'command' which it executes at ~4000 operations per second? I am not running any other administrative, diagnostics, session, or sharding commands on the MongoDb instance.</p>
  
  <p>Is 'command' counter tell the cumulative number of aggregate, count, or group operations?</p>