[...]
Lastly, could someone recommend some relatively cheap third party tracking system (pixel tracking?) that we can use for a month of two to verify if your logging system is not working properly?
If you find a discrepancy between a 3rd party system and your own log files, the one thing that you can know with 100% certainty is that the problem is with the 3rd party system. Don't waste your time.
While this is of course true, you can not always trust the content of your logfiles to reflect reality. E.g. apache have some known bugs[1] that will render your statistics way to high and thus useless in some cases and I've seem similar behavior with proftpd. It puts _way_ to high (exabyte) values in the "bytes sent" field of the log, but I have not found it to be a confirmed bug.
So if your statistics differ from your log files, then it is obviously the analyzers fault.
If it differ from what makes sense however, it may be (has been in my case) the fault of the program generating the logs.
Sincerely yours,
Emil[1] http://issues.apache.org/bugzilla/show_bug.cgi?id=8996
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