Manual:$wgStatsFormatString

From mediawiki.org
Debug: $wgStatsFormatString
When $wgStatsMethod is 'udp', this variable specifies how stats should be formatted.
Introduced in version:1.22.0 (Gerrit change 87030; git #2bad0b96)
Removed in version:1.27.0 (Gerrit change 257404; git #487265cd)
Allowed values:Unspecified
Default value:"stats/%s - %s 1 1 1 1 %s\n"