```ruby
require 'transition/import/dns_details'
require 'transition/distributed_lock'

namespace :import do
  desc 'Look up CNAME details for all hosts'
  task :dns_details => :environment do
    Transition::DistributedLock.new('dns_details').lock do
      Transition::Import::DnsDetails.from_nameserver!
    end
  end
end
```

Tweak DNS Details rake task description
user
```ruby
require 'transition/import/dns_details'
require 'transition/distributed_lock'

namespace :import do
  desc 'Look up DNS details for all hosts'
  task :dns_details => :environment do
    Transition::DistributedLock.new('dns_details').lock do
      Transition::Import::DnsDetails.from_nameserver!
    end
  end
end
```
assistant