Fix app docker (#14080)

* docker app: polling - RRD dataset and fields value mismatch

RRD dataset definitions and fields array keys passed to data_update
have to be in the same order. There is no match based on key before
building the rrdtool update command.

Fixes mem_perc ending as NaN because it ended with a value above 100
as it was given mem_limit bytes value.

* docker app - remove misleading divider

The mem_perc and cpu_usage are already in percent, no need to divide
them by a hundred. The values were then made into milli percent or micro
percent.

includes/html/graphs/application/docker_cpu_usage.inc.php

@@ -2,6 +2,5 @@
 
 $unit_text = 'CPU (%)';
 $rrdVar = 'cpu_usage';
-$divider = 100;
 
 require 'docker-common.inc.php';

includes/html/graphs/application/docker_mem_perc.inc.php

@@ -2,6 +2,5 @@
 
 $unit_text = 'Memory (%)';
 $rrdVar = 'mem_perc';
-$divider = 100;
 
 require 'docker-common.inc.php';

includes/polling/applications/docker.inc.php

@@ -55,9 +55,9 @@ foreach ($docker_data as $data) {
     $fields = [
         'cpu_usage' => (float) $data['cpu'],
         'pids' => $data['pids'],
-        'mem_limit' => convertToBytes($data['memory']['limit']),
-        'mem_used' => convertToBytes($data['memory']['used']),
         'mem_perc' => (float) $data['memory']['perc'],
+        'mem_used' => convertToBytes($data['memory']['used']),
+        'mem_limit' => convertToBytes($data['memory']['limit']),
     ];
 
     $metrics[$container] = $fields;