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https://git.wikimedia.org/blob/mediawiki%2Fcore.git/HEAD/docs%2Fhooks.txt#L316

'AfterFinalPageOutput': At the end of OutputPage::output() but before final
ob_end_flush() which will send the buffered output to the client. This allows
for last-minute modification of the output within the buffer by using
ob_get_clean().
&$output: OutputPage object
 
'AfterImportPage': When a page import is completed.
$title: Title under which the revisions were imported
$origTitle: Title provided by the XML file
$revCount: Number of revisions in the XML file
$sRevCount: Number of successfully imported revisions
$pageInfo: associative array of page information
 
'AfterFinalPageOutput': Nearly at the end of OutputPage::output() but
before OutputPage::sendCacheControl() and final ob_end_flush() which
will send the buffered output to the client. This allows for last-minute
modification of the output within the buffer by using ob_get_clean().
$output: The OutputPage object where output() was called