proced-custom-attributes

proced-custom-attributes is a variable defined in `proced.el'.
Its value is

nil

Documentation:
List of functions defining custom attributes.
This variable extends the functionality of `proced-process-attributes'.
Each function is called with one argument, the list of attributes
of a system process. It returns a cons cell of the form (KEY . VALUE)
like `process-attributes'. This cons cell is appended to the list
returned by `proced-process-attributes'.
If the function returns nil, the value is ignored.

You can customize this variable.