Hiera v3 to v5

v3.yaml

---
:backends:
  - yaml
:hierarchy:
  - "%{::environment}/nodes/%{::trusted.certname}"
  - "%{::environment}/puppetlabs"
  - "%{::environment}/management"
  - "%{::environment}/hosts"
  - "%{::environment}/common"

:yaml:
  :datadir: /etc/puppetlabs/puppet/data

v5-array.yaml

version:     5
defaults:
  datadir:   "data/%{::environment}/"
  data_hash: yaml_data
hierarchy:
  - name:    "Common YAMLs"
    paths:
      - "nodes/%{trusted.certname}.yaml"
      - "puppetlabs.yaml"
      - "management.yaml"
      - "hosts.yaml"
      - "common.yaml"

v5.yaml

---
version:     5
defaults:
  datadir:   "data/%{::environment}/"
  data_hash: yaml_data
hierarchy:
  - name:    "Per-node data (yaml version)"
    path:    "nodes/%{trusted.certname}.yaml"

  - name:    "Puppetlabs Variables"
    path:    "puppetlabs.yaml"

  - name:    "Management host variables"
    path:    "management.yaml"

  - name:    "Hosts"
    path:    "hosts.yaml"

  - name:    "Common variables"
    path:    "common.yaml"