如何在(:all)之前访问rspec中的元数据？

RSpec.configure do |config|
  config.before(:all) do
    # 在(:all)之前访问元数据
    metadata = RSpec.current_example.metadata
    puts "元数据：#{metadata}"
  end
end

RSpec.describe "元数据示例" do
  context "示例组1", example_group_metadata: { group1: true } do
    it "示例1", example_metadata: { example1: true } do
      expect(true).to be_truthy
    end
  end

  context "示例组2", example_group_metadata: { group2: true } do
    it "示例2", example_metadata: { example2: true } do
      expect(true).to be_truthy
    end
  end
end