Checker: don't report missed checks after restarting Icinga

Fixes #3253

components/checker/checkercomponent.cpp

@@ -90,12 +90,14 @@ void CheckerComponent::CheckTimerHandler(void)
 			double lastCheck = cr->Get("execution_end");
 			int missed = (Utility::GetTime() - lastCheck) / service->GetCheckInterval() - 1;
 
-			if (missed > 0) {
+			if (missed > 0 && !service->GetFirstCheck()) {
 				missedChecks += missed;
 				missedServices++;
 			}
 		}
 
+		service->SetFirstCheck(false);
+
 		Logger::Write(LogDebug, "checker", "Executing service check for '" + service->GetName() + "'");
 
 		m_PendingServices.insert(service);

lib/icinga/service.cpp

@@ -34,6 +34,7 @@ static AttributeDescription serviceAttributes[] = {
 	{ "checkers", Attribute_Config },
 
 	{ "scheduling_offset", Attribute_Transient },
+	{ "first_check", Attribute_Transient },
 	{ "next_check", Attribute_Replicated },
 	{ "checker", Attribute_Replicated },
 	{ "check_attempt", Attribute_Replicated },
@@ -225,6 +226,22 @@ long Service::GetSchedulingOffset(void)
 	return value;
 }
 
+void Service::SetFirstCheck(bool first)
+{
+	Set("first_check", first ? 1 : 0);
+}
+
+bool Service::GetFirstCheck(void) const
+{
+	Value value = Get("first_check");
+
+	if (value.IsEmpty())
+		return true;
+
+	return static_cast<long>(value);
+}
+
+
 void Service::SetNextCheck(double nextCheck)
 {
 	Set("next_check", nextCheck);

lib/icinga/service.h

@@ -101,6 +101,9 @@ public:
 	long GetSchedulingOffset(void);
 	void SetSchedulingOffset(long offset);
 
+	void SetFirstCheck(bool first);
+	bool GetFirstCheck(void) const;	
+
 	void SetNextCheck(double nextCheck);
 	double GetNextCheck(void);
 	void UpdateNextCheck(void);