Parse your apache2 logs with qnib/elk
If you are looking for an excuse to use logstash your local webserver is low hanging fruit.
Someone accesses your website and your web server will store some details about the visit:
10.10.0.1 - - [29/Oct/2014:18:42:18 +0100] "GET / HTTP/1.1" 200 2740 "-" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B411 Safari/600.1.4"
10.10.0.1 - - [29/Oct/2014:18:42:19 +0100] "GET /css/main.css HTTP/1.1" 200 2805 "http://qnib.org/" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B411 Safari/600.1.4"
10.10.0.1 - - [29/Oct/2014:18:42:19 +0100] "GET /pics/second_strike_trans.png HTTP/1.1" 200 29636 "http://qnib.org/" "Mozilla/5.0 (iPhone; CPU iPhone OS 8_1 like Mac OS X) AppleWebKit/600.1.4 (KHTML, like Gecko) Version/8.0 Mobile/12B411 Safari/600.1.4"