Given as follows:
level=warn ts=2019-01-24T09:20:01.122920737Z caller=cluster.go:148 component=cluster err="couldn't deduce an advertise address: no private IP found, explicit advertise addr not provided" level=error ts=2019-01-24T09:20:01.129140557Z caller=main.go:199 msg="unable to initialize gossip mesh" err="create memberlist: Failed to get final advertise address: No private IP address found, and explicit IP not provided"
Solution
To reduce alertmanager version to the prom / alertmanager: v0.14.0 no problem