This doesn't check for correctness (we have other scripts that do that)
but just that the service is available at all (the other scripts do not
do that).
This should, and will, be configured with a scheduled trigger in GCB (for us, in
the domain-registry-dev project) and configuration to send some sort of
pub/sub notification on failure (for us, this is already set up on
domain-registry-dev and it sends messages to the "Domain Registry
Notifications" chat channel.
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