statusboard-serverstats.php

<?php

//add your server aliases here
$servers = array(
	"185.14.184.234" => "mcfly.bensmann.no",
	"185.14.184.xxx" => "another.server.com",
);

//change this line to compensate for servers updating less frequenct (65 chosen for servers running curl every 1 min)
$timeinsecondstoalert = 65

//this script is triggered by this command from the terminal or cron:
//echo "time=`uptime`&df=`df -h`" | curl -s -d @- http://domain.com/path/to/script.php
//update 
//record data
if(isset( $_POST['time'], $_POST['df'] )){
	//getting the server load
	preg_match('/\d+\.\d{2}/', $_POST['time'],$load);
	
	//get available disk space
	preg_match('/\d+%/', $_POST['df'],$df);
	
	if(!count($load) || !count($df))
		return false;
	
	$stats = array(
		"df" => $df[0],
		"load" => $load[0],
		"ip" => $_SERVER["REMOTE_ADDR"],
		"time" => (string) time()
	);
	
	save_to_stats($stats);
}else{
	output_stats_table();
}
 
function save_to_stats($stats){
	$data = json_decode( file_get_contents("stats.json"), true );
	$data[  $stats['ip'] ] = $stats;
	file_put_contents("stats.json", json_encode($data), LOCK_EX);
}
 
function output_stats_table(){
	global $servers;
	//display data
	$data = json_decode( file_get_contents("stats.json"), true );
 
	?>
	<table id="projects">
		<?php foreach($data as $server => $stats): ?> 
			<tr>
				
				<td class="server-status" style="width:48px;" ><?php if (time() - (int) $stats['time'] > $timeinsecondstoalert )
				{ 
					echo '<img src="Red_Light_Icon.png">'; ;
				}
				else
					{
						echo '<img src="Green_Light_Icon.png">';
					}  ?></td>
				<td class="server-name" style="width:350px; text-transform:lowercase;"><?php echo $servers[$stats['ip']] ; ?></td>
				
				<td class="server-load" style="width:72px;"><?php echo $stats['load']; ?></td>
				<td class="projectsBars">
				
					<?php for( $i = 1, $j = number_of_bars($stats['df']); $i <= $j; $i++ ): ?>
						<div class="barSegment value<?php echo $i; ?>"></div>
					<?php endfor; ?>
				
				</td>
			</tr>
		<?php endforeach; ?> 
	</table>
 
	<?php
};
 
function number_of_bars($df){
	$value = (int) str_replace('%', '', $df) / 10;
	return round( ($value > 8 ? 8 : $value) * .8 );
}

Update original to include time logging of each update and check to see they have happened as well as red and green light icons to indicate status. Some amendments to table layout.