diff --git a/src/unitxt/metrics.py b/src/unitxt/metrics.py
index 29bb10e6f9..11c7d0b22c 100644
--- a/src/unitxt/metrics.py
+++ b/src/unitxt/metrics.py
@@ -25,7 +25,7 @@
     StreamingOperator,
     StreamInstanceOperator,
 )
-from .operators import CopyFields
+from .operators import CopyFields, FilterByCondition
 from .random_utils import get_seed
 from .settings_utils import get_settings
 from .stream import MultiStream, Stream
@@ -435,42 +435,26 @@ class GlobalMetric(SingleStreamOperator, MetricWithConfidenceInterval):
 
     # calculate scores for single instances
     process_single_instances = True
+    instance_filters: List[FilterByCondition] = OptionalField(
+        default_factory=lambda: []
+    )
 
+    # flake8: noqa: C901
     def process(self, stream: Stream, stream_name: Optional[str] = None) -> Generator:
-        references = []
-        predictions = []
-        task_data = []
-        global_score = {}
-
         instances = []
-
         for instance in stream:
             if "score" not in instance:
-                instance["score"] = {"global": global_score, "instance": {}}
-            else:
-                global_score = instance["score"]["global"]
-
-            instance_references, instance_prediction = (
-                instance["references"],
-                instance["prediction"],
-            )
-            references.append(instance_references)
-            predictions.append(instance_prediction)
-            instances.append(instance)
+                instance["score"] = {"global": {}, "instance": {}}
 
-            instance_task_data = (
-                instance["task_data"] if "task_data" in instance else {}
-            )
-            task_data.append(instance_task_data)
             instance_score = None
             # for backward compatibility
             no_score_value = np.nan
             if self.process_single_instances:
                 try:
                     instance_score = self._compute(
-                        [instance_references],
-                        [instance_prediction],
-                        [instance_task_data],
+                        [instance["references"]],
+                        [instance["prediction"]],
+                        [instance["task_data"] if "task_data" in instance else {}],
                     )
                 except:
                     no_score_value = None
@@ -484,17 +468,68 @@ def process(self, stream: Stream, stream_name: Optional[str] = None) -> Generato
                     instance_score[self.main_score] = no_score_value
 
             instance["score"]["instance"].update(instance_score)
-        self._validate_references_and_prediction(references, predictions)
 
-        result = self._compute(references, predictions, task_data)
+            instances.append(instance)
 
-        global_score.update(result)
+        global_score = instances[0]["score"]["global"]
+        # all instances have the same global score
 
-        score_name = global_score["score_name"]
-        confidence_interval = self.compute_global_confidence_intervals(
-            references, predictions, task_data, score_name
-        )
-        global_score.update(confidence_interval)
+        ms = MultiStream.from_iterables({"tmp": instances})
+
+        class WideOpen(FilterByCondition):
+            def _is_required(self, instance: dict) -> bool:
+                return True
+
+        self.instance_filters.append(WideOpen(condition="eq", values={}))
+
+        for instance_filter in self.instance_filters:
+            if isoftype(instance_filter, WideOpen):
+                score_prefix = ""
+            else:
+                filter_values = str(instance_filter.values)
+                filter_values = filter_values.replace("'", "")
+                filter_values = re.sub(r"[{\[]", "(", filter_values)
+                filter_values = re.sub(r"[}\]]", ")", filter_values)
+                filter_values = re.sub(
+                    r"([ ]*):([ ]*)",
+                    "_" + instance_filter.condition + "_",
+                    filter_values,
+                )
+                score_prefix = self.main_score + "_" + filter_values
+                if score_prefix not in global_score:
+                    global_score[score_prefix] = {}
+
+            references = []
+            predictions = []
+            task_data = []
+            for instance in instance_filter(ms)["tmp"]:
+                references.append(instance["references"])
+                predictions.append(instance["prediction"])
+                task_data.append(
+                    instance["task_data"] if "task_data" in instance else {}
+                )
+
+            self._validate_references_and_prediction(references, predictions)
+            result = self._compute(references, predictions, task_data)
+
+            if score_prefix == "":
+                global_score.update(result)
+            else:
+                global_score[score_prefix].update(result)
+
+            score_name = (
+                global_score["score_name"]
+                if score_prefix == ""
+                else global_score[score_prefix]["score_name"]
+            )
+
+            confidence_interval = self.compute_global_confidence_intervals(
+                references, predictions, task_data, score_name
+            )
+            if score_prefix == "":
+                global_score.update(confidence_interval)
+            else:
+                global_score[score_prefix].update(confidence_interval)
 
         for instance in instances:
             instance["score"]["global"] = global_score
diff --git a/tests/library/test_metrics.py b/tests/library/test_metrics.py
index ace37905b7..06f93bf9eb 100644
--- a/tests/library/test_metrics.py
+++ b/tests/library/test_metrics.py
@@ -44,6 +44,8 @@
     TokenOverlap,
     UnsortedListExactMatch,
 )
+from src.unitxt.operators import FilterByCondition
+from src.unitxt.stream import MultiStream
 from src.unitxt.test_utils.metrics import apply_metric
 from tests.utils import UnitxtTestCase
 
@@ -702,6 +704,47 @@ def test_kendalltau(self):
         global_target = 0.81649658092772
         self.assertAlmostEqual(global_target, outputs[0]["score"]["global"]["score"])
 
+        predictions2 = ["1.0", "3.0", "2.0"]
+        references2 = [["-1.0"], ["1.0"], ["0.0"]]
+        outputs = apply_metric(
+            metric=metric, predictions=predictions2, references=references2
+        )
+        global_target2 = 1.0
+        self.assertAlmostEqual(global_target2, outputs[0]["score"]["global"]["score"])
+
+        instances = [
+            {"planet": "mars", "prediction": pred, "references": ref}
+            for pred, ref in zip(predictions, references)
+        ]
+        instances = instances + [
+            {"planet": "earth", "prediction": pred, "references": ref}
+            for pred, ref in zip(predictions2, references2)
+        ]
+        multi_stream = MultiStream.from_iterables({"test": instances}, copying=True)
+
+        fbc1 = FilterByCondition(condition="eq", values={"planet": "mars"})
+        fbc2 = FilterByCondition(condition="eq", values={"planet": "earth"})
+        metric = KendallTauMetric(instance_filters=[fbc1, fbc2])
+        output_instances = list(metric(multi_stream)["test"])
+        self.assertAlmostEqual(
+            global_target,
+            output_instances[0]["score"]["global"]["kendalltau_b_(planet_eq_mars)"][
+                "score"
+            ],
+        )
+        self.assertAlmostEqual(
+            global_target2,
+            output_instances[0]["score"]["global"]["kendalltau_b_(planet_eq_earth)"][
+                "score"
+            ],
+        )
+        self.assertEqual(
+            output_instances[0]["score"]["global"]["score_name"],
+            output_instances[0]["score"]["global"]["kendalltau_b_(planet_eq_earth)"][
+                "score_name"
+            ],
+        )
+
     def test_detector(self):
         metric = Detector(model_name="MilaNLProc/bert-base-uncased-ear-misogyny")
         predictions = ["I hate women.", "I do not hate women."]