Assuming you have varnish installed on your server and you started to catch the pages on it.Your webserver is now missing the hits to your pages.
Well, that is great for your webserver load, but not too good for your statistics analysis, because
/var/log/apache/access_log will miss the hit.
varnishncsa to get the logs that
awstats will be able to analyse like:
varnishncsa [?a] [?b] [?C] [?c] [?D] [?d] [?f] [?I regex] [?i tag] [?n varnish_name] [?P file] [?r file] [?V] [?w file] [?X regex] [?x tag]
Add this line in the