/etc/trafficserver/parent.config is in trafficserver 5.3.0-2ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# parent.config
#
#
# The purpose of this file is to specify the parent proxy for
# specific objects or sets of objects
#
# Each line consists of a set of tag value pairs. The pairs
# are in the format <tag>=<value>
#
# Each line must include exactly one primary specifier
#
# Primary destination specifiers are
# dest_domain=
# dest_host=
# dest_ip=
# url_regex=
#
#
# Lines may include any number of the secondary specifiers but
# secondary specifiers may not be duplicated on the same line
#
# Secondary specifiers are
# port=
# scheme=
# prefix=
# suffix=
# method=
# time=
# src_ip=
#
# Available parent directives are:
# parent= (a semicolon separated list of parent proxies)
# go_direct={true,false}
# round_robin={strict,true,false}
#
# Note: for round_robin, strict means strict round_robin - parents are
# tried one by one, true means round_robin based on client IP
# addresses, false means no round_robin
#
# Each line must include a parent= directive or a go_direct=
# directive. If both appear, Traffic Server will directly
# contact the origin server if all the listed parent proxies
# are down
#
# Example
#
# Alternate requests between proxy1 and proxy2
#
# dest_domain=. parent="proxy1.example.com:8080; proxy2.example.com:8080" round_robin=strict
#
#
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