How can I see if apache is overloaded and dropping or not accepting connections?

Posted by cat pants on Server Fault See other posts from Server Fault or by cat pants
Published on 2012-07-06T18:45:35Z Indexed on 2012/07/06 21:19 UTC
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apache2

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tuning

Basically I just want to see if apache is handling a current level of high traffic or if I need to tune it to handle more connections. (I have found plenty of information on the actual tuning, so no help needed there)

I know it has been dropping or not accepting connections earlier today, but not seeing anything in the error logs.

Is the expected behavior to throw a 503 in the error log if apache cannot accept more connections?
If so, what error logging level do I need in order to see these?
What is the correct terminology: dropping connections or not accepting connections?

MPM is prefork, OS is Linux, apache version is 2.2.15.

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