Typical Rails log tags

def session_data(request)
  session_key = Rails.application.config.session_options[:key]
  request
    .cookie_jar
    .signed_or_encrypted[session_key] || {}
end

session_id = lambda do |request|
  session_data(request)["session_id"] || "no session"
end

user_id = lambda do |request|
  begin
    warden_data = session_data(request)["warden.user.user.key"]
    "U#{warden_data[0][0]}"
  rescue
    nil
  end
end

Rails.application.config.log_level = :debug
Rails.application.config.log_tags = [
  :host,
  :remote_ip,
  :uuid,
  session_id,
  user_id
]

Very useful! Thanks!