This nomad version bump changes from raft 2 to raft 3 protocol.
After upgrading, reverting back to v1.2.6 is not achievable without utilizing a state backup from 1.2.6, so ensure nomad state snapshot backups are available in the case of emergency.
Docker jobs have not been observed to be adversely affected by the update in testing.
After the upgrade on clients, until jobs are restarted, the nomad log will be spammed with cgroups messages.
Restarting job allocations on clients after this upgrade to eliminate nomad log spamming is preferred but not a hard requirement.