Consistent filename for rotated files

The tag `file` contains each of the found log files, however for memcached the log file is `memcached.log.000018.txt` as the file rotates the name of the file changes i.e. `memcached.log.000019.txt`, this does not offer a consistent file name which will make queries against the file difficult.   

This should be renamed to be just `memcached.log` or something similar without the rotated name included.