Synthetic transactions for a network system are generated based on monitoring of the network system to determine whether the network system may be blind to traffic. A process determines whether an application within an application server in a network system is processing traffic received by the application server, and whether a web server within the network system and in communication with the application server is receiving traffic that requires processing by the application. The process determines that the network system may be blind to the traffic, and, in response, generates a synthetic transaction instruction and a corresponding synthetic transaction to test whether the network system is blind to the traffic. Based on a response of the network system to the synthetic transaction, the process determines whether there is a malfunction of the application server or a period of low traffic activity of the application server.