Handle unknown sla results correctly

Author: yhabteab

library/Icingadb/ProvidedHook/Reporting/Common/ReportData.php

@@ -24,10 +24,18 @@ public function getAverages()
                 $problemTime += $timeline->getProblemTime();
             }
 
+            if ($totalTime <= 0) {
+                continue;
+            }
+
             ++$count;
             $totals += 100 * ($totalTime - $problemTime) / $totalTime;
         }
 
+        if ($count === 0) {
+            return [null];
+        }
+
         return [$totals / $count];
     }
 }

library/Icingadb/ProvidedHook/Reporting/Common/SlaReportUtils.php

@@ -325,7 +325,8 @@ protected function fetchInitialHardState(DateTime $start, string $hostId, string
                         $serviceFilter,
                         Filter::greaterThan('event_time', $start)
                     )
-                );
+                )
+                ->limit(1);
 
             $hardState = $hardState->first();
 

library/Icingadb/ProvidedHook/Reporting/HostSlaReport.php

@@ -31,12 +31,8 @@ protected function createReportData()
 
     protected function createReportRow($row)
     {
-        if ($row->sla === null) {
-            return null;
-        }
-
         return (new ReportRow())
             ->setDimensions([$row->display_name])
-            ->setValues([(float) $row->sla]);
+            ->setValues([$row->sla]);
     }
 }

library/Icingadb/ProvidedHook/Reporting/ServiceSlaReport.php

@@ -33,6 +33,6 @@ protected function createReportRow($row)
     {
         return (new ReportRow())
             ->setDimensions([$row->host_display_name, $row->display_name])
-            ->setValues([(float) $row->sla]);
+            ->setValues([$row->sla]);
     }
 }

library/Icingadb/ProvidedHook/Reporting/SlaReport.php

@@ -119,20 +119,29 @@ public function getHtml(Timerange $timerange, array $config = null)
             // We only have one metric
             $sla = $row->getValues()[0];
 
-            if ($sla < $threshold) {
+            if ($sla === null) {
+                $slaClass = 'unknown';
+            } elseif ($sla < $threshold) {
                 $slaClass = 'nok';
             } else {
                 $slaClass = 'ok';
             }
 
-            $cells[] = Html::tag('td', ['class' => "sla-column $slaClass"], round($sla, $precision));
+            $cells[] = Html::tag(
+                'td',
+                ['class' => "sla-column $slaClass"],
+                $sla === null ? t('N/A') : round($sla, $precision)
+            );
 
             $tableRows[] = Html::tag('tr', null, $cells);
         }
 
         // We only have one average
         $average = $data->getAverages()[0];
-        if ($average < $threshold) {
+
+        if ($average === null) {
+            $slaClass = 'unknown';
+        } elseif ($average < $threshold) {
             $slaClass = 'nok';
         } else {
             $slaClass = 'ok';
@@ -144,7 +153,11 @@ public function getHtml(Timerange $timerange, array $config = null)
 
         $tableRows[] = Html::tag('tr', null, [
             Html::tag('td', ['colspan' => count($data->getDimensions())], $total),
-            Html::tag('td', ['class' => "sla-column $slaClass"], round($average, $precision))
+            Html::tag(
+                'td',
+                ['class' => "sla-column $slaClass"],
+                $average === null ? t('N/A') : round($average, $precision)
+            )
         ]);
 
         $table = Html::tag(