That looks like the coredns server does not have an answer for "nova-api-mysql-router.openstack.svc.cluster.local" so passes it upstream with the .maas suffix attached - which then fails in some way due to the io timeout
That looks like the coredns server does not have an answer for "nova-api- mysql-router. openstack. svc.cluster. local" so passes it upstream with the .maas suffix attached - which then fails in some way due to the io timeout