title: HikariPoolMXBean - getThreadsAwaitingConnection - what do threads refer to?
body: <p>I'm trying to use the HikariPoolMXBean to gather connection pool metrics and want to be clear on what one of the metrics means:</p>
  <pre><code>/**
      * Get the number of threads awaiting connections from the pool.  The return value is extremely transient and is
      * a point-in-time measurement.
      *
      * @return the number of threads awaiting a connection from the pool
      */
     int getThreadsAwaitingConnection();
  </code></pre>
  <p>In the context of this metric, what is a thread? Is it an application thread, database thread, or something else? Is it a thread used internally by HikariCP?</p>