Added Performance Counter Check Command

lib/plugins/Invoke-IcingaCheckPerfcounter.psm1

@@ -0,0 +1,36 @@
+Import-IcingaLib icinga\plugin;
+
+function Invoke-IcingaCheckPerfcounter()
+{
+    param(
+        [array]$PerfCounter,
+        $Warning,
+        $Critical,
+        [switch]$NoPerfData,
+        [int]$Verbose
+    );
+
+    $Counters     = New-IcingaPerformanceCounterArray -CounterArray $PerfCounter;
+    $CheckPackage = New-IcingaCheckPackage -Name 'Performance Counter' -OperatorAnd -Verbose $Verbose;
+
+    foreach ($counter in $Counters.Keys) {
+
+        $CounterPackage = New-IcingaCheckPackage -Name $counter -OperatorAnd -Verbose $Verbose;
+
+        foreach ($instanceName in $Counters[$counter].Keys) {
+            $instance = $Counters[$counter][$instanceName];
+            if ($instance -isnot [hashtable]) {
+                $IcingaCheck  = New-IcingaCheck -Name $counter -Value $Counters[$counter].Value;
+                $IcingaCheck.WarnOutOfRange($Warning).CritOutOfRange($Critical) | Out-Null;
+                $CounterPackage.AddCheck($IcingaCheck);
+                break;
+            }
+            $IcingaCheck  = New-IcingaCheck -Name $instanceName -Value $instance.Value;
+            $IcingaCheck.WarnOutOfRange($Warning).CritOutOfRange($Critical) | Out-Null;
+            $CounterPackage.AddCheck($IcingaCheck);
+        }
+        $CheckPackage.AddCheck($CounterPackage);
+    }
+
+    return (New-IcingaCheckresult -Check $CheckPackage -NoPerfData $NoPerfData -Compile);
+}