Tagged loggers like ActiveSupport::TaggedLogger make logging both named and 
unnamed tags visible for better application debugging. Currently log_tags 
only supported an array of tags such as:

config.log_tags = [
  ->(request) { some_computed_value }

However as this list gets long it has two issues:

1.  Parsing JSON logs requires positional references (ie remote_ip will
always be at some index)
2.  Some tags look similar and are hard to discern in a log message.
For example a datadog trace id and epoch time look indistinguishable to a
human reading those logs

I submitted https://github.com/rails/rails/pull/38009 as one solution 

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