exp save: Track top level files

dvc/repo/experiments/executor/base.py

@@ -34,6 +34,8 @@
     ExpRefInfo,
 )
 from dvc.repo.experiments.utils import to_studio_params
+from dvc.repo.metrics.show import _collect_top_level_metrics
+from dvc.repo.params.show import _collect_top_level_params
 from dvc.stage.serialize import to_lockfile
 from dvc.ui import ui
 from dvc.utils import dict_sha256, env2bool, relpath
@@ -275,6 +277,13 @@ def save(
         else:
             os.chdir(dvc.root_dir)
 
+        include_untracked = include_untracked or []
+        include_untracked.extend(_collect_top_level_metrics(dvc))
+        include_untracked.extend(_collect_top_level_params(dvc))
+        include_untracked.extend(
+            dvc.index._plot_sources  # pylint: disable=protected-access
+        )
+
         try:
             stages = dvc.commit([], force=True, relink=False)
             exp_hash = cls.hash_exp(stages)

tests/func/experiments/test_save.py

@@ -116,3 +116,23 @@ def test_exp_save_include_untracked_warning(tmp_dir, dvc, scm, mocker):
 
     dvc.experiments.save(name="exp", include_untracked=["new_dir"])
     assert not logger.warning.called
+
+
+def test_untracked_top_level_files_are_included_in_exp(tmp_dir, scm, dvc):
+    (tmp_dir / "dvc.yaml").dump(
+        {
+            "metrics": ["metrics.json"],
+            "params": ["params.yaml"],
+            "plots": ["plots.csv"],
+        }
+    )
+    stage = dvc.stage.add(
+        cmd="touch metrics.json && touch params.yaml && touch plots.csv",
+        name="top-level",
+    )
+    scm.add_commit(["dvc.yaml"], message="add dvc.yaml")
+    dvc.reproduce(stage.addressing)
+    exp = dvc.experiments.save()
+    fs = scm.get_fs(exp)
+    for file in ["metrics.json", "params.yaml", "plots.csv"]:
+        assert fs.exists(file)