Manual:$wgProfilePerHost

Profiling: $wgProfilePerHost
Should the application server hostname be stored in the profiling table?
Introduced in version:1.7.0 (r14436)
Deprecated in version:1.25.0 (Gerrit change 177283; git #62eb6762)
Removed in version:1.27.0 (Gerrit change 257404; git #487265cd)
Allowed values:(boolean)
Default value:null (MW 1.25+)
false (MW 1.7–1.24)

Details

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Should the application server hostname be stored in the profiling table?

In MediaWiki 1.25 and later, set $wgProfiler ['perhost'] = true; instead of $wgProfilePerHost = true;.