revert breaking change

lib/datadog/tracing/metadata/errors.rb

@@ -10,6 +10,14 @@ module Metadata
       # Adds error tagging behavior
       # @public_api
       module Errors
+        def set_error(e)
+          Datadog::Core.log_deprecation do
+            'Errors.set_error(..) is deprecated. ' \
+            'Use Errors.set_error_tags(..) instead.'
+          end
+          set_error_tags(e)
+        end
+
         # Mark the span with the given error.
         def set_error_tags(e)
           e = Core::Error.build_from(e)

spec/datadog/tracing/metadata/errors_spec.rb

@@ -12,21 +12,23 @@
     end
   end
 
-  describe '#set_error_tags' do
-    subject(:set_error_tags) { test_object.set_error_tags(error) }
+  Array(['set_error', 'set_error_tags']) do |method_name|
+    describe "##{method_name}" do
+      subject(:error_setter) { test_object.send(method_name) }
 
-    let(:error) { RuntimeError.new('oops') }
-    let(:backtrace) { %w[method1 method2 method3] }
+      let(:error) { RuntimeError.new('oops') }
+      let(:backtrace) { %w[method1 method2 method3] }
 
-    before { error.set_backtrace(backtrace) }
+      before { error.set_backtrace(backtrace) }
 
-    it do
-      set_error_tags
+      it do
+        error_setter
 
-      expect(test_object).to have_error_message('oops')
-      expect(test_object).to have_error_type('RuntimeError')
-      backtrace.each do |method|
-        expect(test_object).to have_error_stack(include(method))
+        expect(test_object).to have_error_message('oops')
+        expect(test_object).to have_error_type('RuntimeError')
+        backtrace.each do |method|
+          expect(test_object).to have_error_stack(include(method))
+        end
       end
     end
   end