add PISystemMonitor measurer signal

libs/main/application/pisystemmonitor.cpp

@@ -341,6 +341,7 @@ void PISystemMonitor::run() {
 	stat = tstat;
 	stat.makeStrings();
 	stat_mutex.unlock();
+	measured();
 }
 
 

libs/main/application/pisystemmonitor.h

@@ -242,6 +242,9 @@ public:
 	//! \~russian
 	static ullong usedRAM();
 
+	//! \~english
+	//! \~russian
+	EVENT(measured);
 
 private:
 	void run() override;