Index: includes/entities/probe.inc.php
===================================================================
--- includes/entities/probe.inc.php     (revision 15424)
+++ includes/entities/probe.inc.php     (working copy)
@@ -18,31 +18,44 @@
 }

 // Helper function to parse Nagios performance data string

 function parse_nagios_perfdata(string $perfdata_string): array
 {
     $metrics = [];
-    $pattern = "/'?(.+?)'?=([0-9\.\-]+)([a-zA-Z%]*c?);?([^;]*);?([^;]*);?([^;]*);?([^;]*)/";

+    $pattern = "/(?:^|\s)(?:'([^']+)'|([^\s=]+))=" .
+        "([-+]?(?:\d+(?:\.\d*)?|\.\d+))" .
+        "([a-zA-Z%]*)" .
+        "(?:;([^;\s]*))?" .
+        "(?:;([^;\s]*))?" .
+        "(?:;([^;\s]*))?" .
+        "(?:;([^;\s]*))?/";
+
     if (preg_match_all($pattern, $perfdata_string, $matches, PREG_SET_ORDER)) {
         foreach ($matches as $match) {
-            $uom  = trim($match[3]) ?? '';
+            $label = $match[1] !== '' ? $match[1] : $match[2];
+            $uom = $match[4] ?? '';
+
             $type = str_ends_with($uom, 'c') ? 'COUNTER' : 'GAUGE';
+
             if ($type === 'COUNTER') {
-                $uom = rtrim($uom, 'c');
+                $uom = substr($uom, 0, -1);
             }

             $metrics[] = [
-                'label' => trim($match[1]),
-                'value' => (float) $match[2],
+                'label' => $label,
+                'value' => (float) $match[3],
                 'uom'   => $uom,
                 'type'  => $type,
-                'warn'  => trim($match[4]) ?? '',
-                'crit'  => trim($match[5]) ?? '',
-                'min'   => trim($match[6]) ?? '',
-                'max'   => trim($match[7]) ?? '',
+                'warn'  => $match[5] ?? '',
+                'crit'  => $match[6] ?? '',
+                'min'   => $match[7] ?? '',
+                'max'   => $match[8] ?? '',
             ];
         }
     }
+
     return $metrics;
 }