Returns the nested-depth of the current task
thread_indent_depth:long(delta:long)
delta
the amount of depth added/removed for each call
This function returns an integer equal to the nested function-call depth starting from the outermost initial level. This function is useful for saving space (consumed by whitespace) in traces with long nested function calls. Use this function in a similar fashion to thread_indent, i.e., in call-probe, use thread_indent_depth(1) and in return-probe, use thread_indent_depth(-1)