Nomad 0.11.0 could cause an unrecoverable server panic in garbage collection. If a job is updated with a new or a renamed task group and then the job is purged, the server may panic unexpectedly.
The release includes other fixes. The full list of changes may be found in the changelog.
The Nomad Team
Changelog - https://github.com/hashicorp/nomad/blob/v0.11.1/CHANGELOG.md
Binaries - https://releases.hashicorp.com/nomad/0.11.1/