I'm using a couple different versions of kubernetes - 1.7, 1.8, and 1.9 - and I'd like to know what log message to look for to know when a pod has been migrated from one node to another.
One very easy way is to use the API through proxy.
For example:
kubectl proxy
curl -s 127.0.0.1:8001/api/v1/watch/events
That will generate some json output, and you may use a grep command or jq command to format this json output.
curl -s 127.0.0.1:8001/api/v1/watch/events | jq