You need at least two masters for etcd quorum. Without etcd quorum REST calls won't succeed. You'll need to get information from all masters, not just one. the connection refused messages from etcd here suggest that etcd is in a fatal state.
if only one master is running, the near total failure of the kube-apiserver is expected because etcd will not have a quorum. Only one set of master-node pod logs was included.
next steps
1. ensure that at least two, preferably three physical (or virtual) master nodes (the machines themselves) are running
2. wait for 5 minutes
3. confirm you still have failures
4. collect pod logs, kubelet logs, and crio logs from all the masters
With at least two master nodes running, we can reasonably expect the cluster to have an available kube-apiserver. Without that, there isn't much to do.