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/usr/share/logtail/detectrotate/30-logrotate-dateext.dtr is in logtail 1.3.14.

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#!/usr/bin/perl

sub {
  my ($filename) = @_;
  my $rotated_filename="";
  # find out whether we have a dateext rotation scheme
  my @list = glob("$filename-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]");
  if ( @list ) {
    $rotated_filename = (sort(glob("$filename-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]")))[-1];
  }
  return $rotated_filename;
}