SymptomsCustom changes to AWStats setting need to be made, but Plesk keeps overwriting them.
ResolutionSettings overwriting can be prevented by configuring the domain configuration file located in %plesk_dir%Additional\AWStats\wwwroot\cgi-bin\
The file name is similar to awstats.<domain name>.conf where <domain name> is a name of a domain. Changes made to this file will permanently configure web statistics on the domain.
Note: All changes made in awstats.<domain name>.conf on domain level in %plesk_vhosts%<domain name>\statistics\webstat\AWStats\wwwroot\cgi-bin\ will be overwritten by the file from %plesk_dir%Additional\AWStats\wwwroot\cgi-bin\
But there is a list of parameters that are required by Plesk and will be overwritten in any case:
LogType, LogFormat, SiteDomain, HostAliases, DNSLookup, DirData, DirCgi, DirIcons, SaveDatabaseFilesWithPermissionsForEveryone, DefaultFile, LogFile, HTMLEndSection