[tor-bugs] #30020 [Internal Services/Tor Sysadmin Team]: switch from our custom YAML implementation to Hiera

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#30020: switch from our custom YAML implementation to Hiera
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     Reporter:  anarcat                          |      Owner:  anarcat
         Type:  project                          |     Status:  assigned
     Priority:  Medium                           |  Milestone:
    Component:  Internal Services/Tor Sysadmin   |    Version:
  Team                                           |
     Severity:  Normal                           |   Keywords:
Actual Points:                                   |  Parent ID:  #29387
       Points:                                   |   Reviewer:
      Sponsor:                                   |
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 We currently use a custom-made YAML database for assigning roles to
 servers and other metadata. I started using Hiera for some hosts and it
 seems to be working well.

 Hiera is officially supported in Puppet and shipped by default in Puppet 5
 and later. It's the standard way of specifying metadata and class
 parameters for hosts. I suspect it covers most of our needs in terms of
 metadata and should cover most if not all of what we're currently doing
 with the YAML stuff in Puppet.

 We should therefore switch to using Hiera instead of our homegrown
 solution.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30020>
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