Error Handler for Nest Pipeline

Hi, 

I am building error handler (with functionality to log error details in snowflake) for a nest pipeline (3 layers), and have a few questions 

1. I want have captured pipeline parameters such as ruuid, startTime, but when I execute the functionality, such parameters are not recorded and I receive a null response in the handler output. 

2. For error handler, in a parent-child pipeline, can log details for "pipeline execute" snap ?