Fixes MetricsOverTime reporting unknown for checks which do not write performance data (like process plugin)

Author: LordHepipud

lib/icinga/plugin/Compare-IcingaPluginThresholds.psm1

@@ -97,7 +97,8 @@ function Compare-IcingaPluginThresholds()
         [switch]$IsBetween      = $FALSE,
         [switch]$IsLowerEqual   = $FALSE,
         [switch]$IsGreaterEqual = $FALSE,
-        [string]$TimeInterval   = $null
+        [string]$TimeInterval   = $null,
+        [switch]$NoPerfData     = $FALSE
     );
 
     try {
@@ -109,6 +110,13 @@ function Compare-IcingaPluginThresholds()
             'Interval' = $TimeInterval;
         };
 
+        # Ensure we do not include our checks for which we do not write any performance data
+        # Metrics over time will not work for those, as the metrics are not stored.
+        # There just set the variable to null which means they won't be processed
+        if ($NoPerfData) {
+            $MoTData = $null;
+        }
+
         if ($TestInput.Decimal) {
             [decimal]$InputValue = [decimal]$TestInput.Value;
         }

lib/icinga/plugin/New-IcingaCheck.psm1

@@ -39,7 +39,7 @@ function New-IcingaCheck()
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name 'ObjectExists'      -Value $ObjectExists;
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name 'Translation'       -Value $Translation;
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name 'LabelName'         -Value $LabelName;
-    $IcingaCheck | Add-Member -MemberType NoteProperty -Name 'NoPerfData'        -Value $NoPerfData;
+    $IcingaCheck | Add-Member -MemberType NoteProperty -Name 'NoPerfData'        -Value ([bool]$NoPerfData);
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name '__WarningValue'    -Value $null;
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name '__CriticalValue'   -Value $null;
     $IcingaCheck | Add-Member -MemberType NoteProperty -Name '__LockedState'     -Value $FALSE;
@@ -490,6 +490,7 @@ function New-IcingaCheck()
             '-ThresholdCache' = (Get-IcingaThresholdCache -CheckCommand $this.__CheckCommand);
             '-Translation'    = $this.Translation;
             '-TimeInterval'   = $this.__TimeInterval;
+            '-NoPerfData'     = $this.NoPerfData;
         };
     }