• Add ::ActiveSupport::CombinedConfiguration to offer interchangeable access to configuration provided by either ENV or encrypted credentials. Used by Rails to first look at ENV, then look in encrypted credentials, but can be configured separately with any number of API-compatible backends in a first-look order.

  DHH

• Add ::ActiveSupport::EnvConfiguration to provide access to ENV variables in a way that's compatible with ::ActiveSupport::EncryptedConfiguration and therefore can be used by ::ActiveSupport::CombinedConfiguration.

  Examples:

  conf = ActiveSupport::EnvConfiguration.new
  conf.require(:db_host) # ENV.fetch("DB_HOST")
  conf.require(:aws, :access_key_id) # ENV.fetch("AWS__ACCESS_KEY_ID")
  conf.option(:cache_host) # ENV["CACHE_HOST"]
  conf.option(:cache_host, default: "cache-host-1") # ENV["CACHE_HOST"] || "cache-host-1"
  conf.option(:cache_host, default: -> { "cache-host-1" }) # ENV["CACHE_HOST"] || "cache-host-1"

  DHH

• Make flaky parallel tests easier to diagnose by deterministically assigning tests to workers.

  Rails assigns tests to workers in round-robin order so the same --seed and worker count will result in the same sequence of tests running on each worker (whether processes or threads) increasing the odds of reproducing test failures caused by test interdependence.

  This can make test runtime slower and spikier when one worker gets most of the slow tests. Enable work_stealing: true to allow idle workers to steal tests from busy workers in deterministic order, smoothing out runtime at the cost of less reproducible flaky-test failures.

  Jeremy Daer

• Make ActiveSupport::EventReporter#debug_mode? true by default to emit debug events outside of Rails application contexts.

  Gannon McGibbon

• Add SecureRandom.base32 for generating case-insensitive keys that are unambiguous to humans.

  Stanko Krtalic Rusendic & Miha Rekar

• Add a fast failure mode to ::ActiveSupport::ContinuousIntegration that stops the rest of the run after a step fails. Invoke by running bin/ci --fail-fast or bin/ci -f.

  Dennis Paagman

• Implement LocalCache strategy on ::ActiveSupport::Cache::MemoryStore. The memory store needs to respond to the same interface as other cache stores (e.g. ActiveSupport::NullStore).

  Mikey Gough

• Add a detailed failure summary to ::ActiveSupport::ContinuousIntegration.

  Mike Dalessio

• Introduce ::ActiveSupport::EventReporter::LogSubscriber structured event logging.

  class MyLogSubscriber < ActiveSupport::EventReporter::LogSubscriber
    self.namespace = "test"
  
    def something(event)
      info { "Event #{event[:name]} emitted." }
    end
  end

  Gannon McGibbon

Please check [8-1-stable]) for previous changes.