Add missing DowntimesExpireTimer.

now the expired downtimes will get deleted every 60 seconds.

fixes #4711

lib/icinga/service-downtime.cpp

@@ -289,6 +289,16 @@ bool Service::IsDowntimeExpired(const Dictionary::Ptr& downtime)
 	return (downtime->Get("end_time") < Utility::GetTime());
 }
 
+void Service::StartDowntimesExpiredTimer(void)
+{
+        if (!l_DowntimesExpireTimer) {
+		l_DowntimesExpireTimer = boost::make_shared<Timer>();
+		l_DowntimesExpireTimer->SetInterval(60);
+		l_DowntimesExpireTimer->OnTimerExpired.connect(boost::bind(&Service::DowntimesExpireTimerHandler));
+		l_DowntimesExpireTimer->Start();
+        }
+}
+
 void Service::AddDowntimesToCache(void)
 {
 	Log(LogDebug, "icinga", "Updating Service downtimes cache.");

lib/icinga/service.cpp

@@ -51,6 +51,8 @@ void Service::Start(void)
 
 	AddDowntimesToCache();
 	AddCommentsToCache();
+
+	StartDowntimesExpiredTimer();
 }
 
 void Service::OnConfigLoaded(void)

lib/icinga/service.h

@@ -275,6 +275,8 @@ public:
 	static bool IsDowntimeTriggered(const Dictionary::Ptr& downtime);
 	static bool IsDowntimeExpired(const Dictionary::Ptr& downtime);
 
+	void StartDowntimesExpiredTimer(void);
+
 	bool IsInDowntime(void) const;
 	bool IsAcknowledged(void);