title: SQS maximum inflight message count is lower than documentation says
body: <p>According to the <a href="http://docs.aws.amazon.com/AWSSimpleQueueService/latest/SQSDeveloperGuide/limits-queues.html" rel="nofollow noreferrer">SQS documentation</a>, the maximum number of inflight messages is set to 120,000 for standard queues. However, sometimes I see my queues maxing out at lower numbers, such as here:
  <a href="https://i.stack.imgur.com/6x3tN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6x3tN.png" alt="Max inflight messages at 100K"></a></p>
  
  <p>Does anyone know why this might be the case? I have code that dynamically changes the number of SQS listeners depending on the number of messages in the queue, but I don't want to do anything if I've hit the maximum. My problem is now that the max limit doesn't seem to be consistent. Some queues go to 120K, but this one is stuck at 100K instead, and as far as I can tell there is no setting that allows me to set this limit.</p>