Describe the bug

sanitize_fields has been removed, but there is no description of how to use the data scrubbing features https://docs.sentry.io/platforms/ruby/data-management/sensitive-data/#scrubbing-data and https://docs.sentry.io/platforms/ruby/configuration/filtering/

Sentry.init do |config|
  config.before_send = lambda do |event, hint|
    event[:key] = value
    event
  end
end

It would be good if this was a concrete example showing how to replicate the sanitize_fields functionality, it is unclear what value is here and how to access request parameters from the event.