add sps to heartbeat.

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@7126 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/switch_core.c

@@ -70,6 +70,7 @@ static void send_heartbeat(void)
 								duration.ms, duration.ms == 1 ? "" : "s", duration.mms, duration.mms == 1 ? "" : "s");
 
 		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Session-Count", "%u", switch_core_session_count());
+		switch_event_add_header(event, SWITCH_STACK_BOTTOM, "Session-Per-Sec", "%u", runtime.sps);
 		switch_event_fire(&event);
 	}
 }