Commits on Aug 25, 2020

1. Make all registry methods thread safe …

   The registry is backed by a Hash, which is not guaranteed to be thread
   safe on all interpreters. For peace of mind, this change synchronizes
   all accesses to the metrics hash.
   
   Another option would have been to use a [thread-safe Hash][1] instead of
   a Hash but this would have meant adding Ruby Concurrent as a
   dependency, which I'm assuming we don't want.
   
   Ref: prometheus#184 (comment)
   
   [1]: https://github.com/ruby-concurrency/concurrent-ruby/blob/v1.1.7/lib/concurrent-ruby/concurrent/hash.rb
   
   Signed-off-by: Matthieu Prat <matthieuprat@gocardless.com>

   

   matthieuprat committed Aug 25, 2020
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