diff --git a/dvc/output.py b/dvc/output.py
index 10f818fa9..3e86a4804 100644
--- a/dvc/output.py
+++ b/dvc/output.py
@@ -298,15 +298,6 @@ class Output:
     PARAM_PUSH = "push"
     PARAM_CLOUD = "cloud"
 
-    METRIC_SCHEMA = Any(
-        None,
-        bool,
-        {
-            PARAM_METRIC_TYPE: Any(str, None),
-            PARAM_METRIC_XPATH: Any(str, None),
-        },
-    )
-
     DoesNotExistError: Type[DvcException] = OutputDoesNotExistError
     IsNotFileOrDirError: Type[DvcException] = OutputIsNotFileOrDirError
     IsStageFileError: Type[DvcException] = OutputIsStageFileError
@@ -1417,7 +1408,6 @@ ARTIFACT_SCHEMA = {
     **CHECKSUMS_SCHEMA,
     **META_SCHEMA,
     Required(Output.PARAM_PATH): str,
-    Output.PARAM_PLOT: bool,
     Output.PARAM_PERSIST: bool,
     Output.PARAM_CLOUD: CLOUD_SCHEMA,
 }
@@ -1433,7 +1423,6 @@ SCHEMA = {
     **ARTIFACT_SCHEMA,
     **ANNOTATION_SCHEMA,
     Output.PARAM_CACHE: bool,
-    Output.PARAM_METRIC: Output.METRIC_SCHEMA,
     Output.PARAM_REMOTE: str,
     Output.PARAM_PUSH: bool,
     Output.PARAM_FILES: [DIR_FILES_SCHEMA],
diff --git a/tests/func/test_repro.py b/tests/func/test_repro.py
index a3953a2a5..08ced290c 100644
--- a/tests/func/test_repro.py
+++ b/tests/func/test_repro.py
@@ -639,31 +639,36 @@ def test_repro_metrics_add_unchanged(tmp_dir, dvc, copy_script):
     assert len(stages) == 1
     assert stages[0] is not None
 
-    file1 = "file1"
-    file1_stage = file1 + ".dvc"
     dvc.run(
-        fname=file1_stage,
-        outs_no_cache=[file1],
+        outs_no_cache=["file1"],
         deps=["foo", "copy.py"],
-        cmd=f"python copy.py foo {file1}",
-        single_stage=True,
+        cmd="python copy.py foo file1",
+        name="copy",
     )
 
-    stages = dvc.reproduce(file1_stage)
+    stages = dvc.reproduce("copy")
     assert len(stages) == 0
 
-    d = load_yaml(file1_stage)
-    d["outs"][0]["metric"] = True
-    dump_yaml(file1_stage, d)
+    dvc.stage.add(
+        metrics_no_cache=["file1"],
+        deps=["foo", "copy.py"],
+        cmd="python copy.py foo file1",
+        name="copy",
+        force=True,
+    )
 
-    stages = dvc.reproduce(file1_stage)
+    stages = dvc.reproduce("copy")
     assert len(stages) == 0
 
-    d = load_yaml(file1_stage)
-    d["outs"][0]["metric"] = False
-    dump_yaml(file1_stage, d)
+    dvc.stage.add(
+        outs_no_cache=["file1"],
+        deps=["foo", "copy.py"],
+        cmd="python copy.py foo file1",
+        name="copy",
+        force=True,
+    )
 
-    stages = dvc.reproduce(file1_stage)
+    stages = dvc.reproduce("copy")
     assert len(stages) == 0