Bamboo should log exceptions in a second log file.

Often when errors occur in Bamboo, the customers roll the bamboo logs - this means there is no information indicating the cause of the exception.

It would be helpful if Bamboo could log exceptions in a special file - other than atlassian-bamboo log file which may grow very big, if the customer is outputting huge amounts of build/test logs to atlassian-bamboo logs.

From, BSP-293