The complete design specification can be found https://docs.google.com/document/d/1T_vM-Upa23aA21sanFTTLZa3j9xV6R32djJk6-muWzI/edit#heading=h.610fausqnpu6[here].

In implementing this spec, we have introduced the following breaking changes to the `ProblemSpec` interface:

  curl_cmd+=("${EXTRA_ADDONS_URL}")

  "${curl_cmd[@]}"
}

# A function that fetches a GCE metadata value and echoes it out.
# Args:
#   $1 : URL path after /computeMetadata/v1/ (without heading slash).
#   $2 : An optional default value to echo out if the fetch fails.
#
# NOTE: this function is duplicated in configure.sh, any changes here should be
# duplicated there as well.
function get-metadata-value {