1. A method for displaying key statistics for a designed application in a user interface for an application design tool, the method comprising: providing a graphical user interface for a design tool via which a designer can design an application, wherein the design tool enables a designer to graphically create an application flow using a sequence of nodes that represent functions in the application; receiving an application design from a designer that is designed using the design tool; generating application code for the designed application, wherein generating the application code includes inserting a set of markers in the application code that demarks boundaries between nodes in the designed application; executing the application, wherein, for each instance of the application executed, a log is created in accordance with the markers such that data is logged for nodes traversed during the execution of the application; calculating statistics, based on the logged data, for one or more of the nodes; displaying the nodes in the graphical user interface to display the application flow; prompting the designer to enter threshold values for one or more statistics; identifying the nodes associated with statistics that satisfy the threshold requirements; and displaying statistical information, based on the calculated statistics, for only nodes associated with statistics that satisfy one or more threshold requirements, wherein the statistical information comprises at least one of (i) traffic at the node being greater than or equal to a specified amount or percentage of total traffic, (ii) disconnects at the node being greater than or equal to a specified amount or percentage of executions of the node, (iii) errors at the node being greater than or equal to a specified amount or percentage of executions of the node, and (iv) agent requests at the node being greater than or equal to a specified amount or percentage of executions of the node, and wherein nodes associated with statistics that do not satisfy the one or more threshold requirements are displayed without statistical information.