getLagTimes.php

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<?php
require_once __DIR__ . '/Maintenance.php';

class GetLagTimes extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Dump replication lag times' );
    }

    public function execute() {
        $lb = wfGetLB();

        if ( $lb->getServerCount() == 1 ) {
            $this->error( "This script dumps replication lag times, but you don't seem to have\n"
                . "a multi-host db server configuration." );
        } else {
            $lags = $lb->getLagTimes();
            foreach ( $lags as $n => $lag ) {
                $host = $lb->getServerName( $n );
                if ( IP::isValid( $host ) ) {
                    $ip = $host;
                    $host = gethostbyaddr( $host );
                } else {
                    $ip = gethostbyname( $host );
                }
                $starLen = min( intval( $lag ), 40 );
                $stars = str_repeat( '*', $starLen );
                $this->output( sprintf( "%10s %20s %3d %s\n", $ip, $host, $lag, $stars ) );
            }
        }
    }
}

$maintClass = "GetLagTimes";
require_once RUN_MAINTENANCE_IF_MAIN;