Manual:$wgLogAutocreatedAccounts

User accounts, authentication: $wgLogAutocreatedAccounts
Whether to log automatic creations of new users accounts.
Introduced in version:1.17.0 (r64853)
Removed in version:1.18.0 (r85128)
Allowed values:(boolean)
Default value:false

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Whether to log automatic creations of new users accounts.