Specific events are not recorded in load runner scripting,why?

This is problem could be caused by the event being dropped as “uninteresting”.

 By default, VuGen’s Web (HTTP/HTML)protocol records client requests that return an HTTP response

 status of 2xx or 302, and discards all other requests. If a missing request returns a response that

 was discarded, such as 301, you can make a modification to the registry to instruct VuGen to 

generate a command for it:

Locate the following registry key:
[HKEY_CURRENT_USER\Software\Mercury Interactive\Networking\Multi Settings\QTWeb\Recording]
Add the following string value to it:
"GenerateApiFuncForCustomHttpStatus"="301"