I have written a custom tool for that: https://plus.google.com/u/0/102275357970232913798/posts/Fsu6qftH2ja
Alfa is a GUI tool for analyzing log files. Usually you are forced to search for data in them using editors. You open a log, press Ctrl-F and the "Next" button again and again, then reload the file as it was modified, and repeat the search. Alfa maps a log file to a database allowing you to use standard SQL queries to get data without any superfluous actions.
UPD: Google killed Google+ so please use other link: https://drive.google.com/drive/folders/0B-hYEtveqA0aN1E3Ul9NVlFlYWM
