uptime_check_ips The returned list of IP addresses (including
region and location) that the checkers run from.
next_page_token This field represents the pagination token to retrieve the
next page of results. If the value is empty, it means no
further results for the request. To retrieve the next page
of results, the value of the next_page_token is passed to
the subsequent List method call (in the request message's
page_token field). NOTE: this field is not yet implemented