You could set up custom logs in your httpd-vhosts.conf depending on the HTTP_HOST variable – if your server is an Apache and you use subdomains for each single site.

For sub directories:

SetEnvIf Request_URI ^sitename1 sitename1
SetEnvIf Request_URI ^sitename2 sitename2
CustomLog sitename1.log common env=sitename1
CustomLog sitename1.log common env=sitename2

not tested

You could set up custom logs in your httpd-vhosts.conf depending on the HTTP_HOST variable – if your server is an Apache and you use subdomains for each single site.

For sub directories (not tested):

SetEnvIf Request_URI ^sitename1 sitename1
SetEnvIf Request_URI ^sitename2 sitename2
CustomLog sitename1.log common env=sitename1
CustomLog sitename2.log common env=sitename2

You could set up custom logs in your httpd-vhosts.conf depending on the HTTP_HOST variable – if your server is an Apache and you use subdomains for each single site.

You could set up custom logs in your httpd-vhosts.conf depending on the HTTP_HOST variable – if your server is an Apache and you use subdomains for each single site.

For sub directories:

SetEnvIf Request_URI ^sitename1 sitename1
SetEnvIf Request_URI ^sitename2 sitename2
CustomLog sitename1.log common env=sitename1
CustomLog sitename1.log common env=sitename2

not tested