diff --git a/evals/benchmark/stresscli/commands/metrics.py b/evals/benchmark/stresscli/commands/metrics.py
index cfe1948f..08474491 100644
--- a/evals/benchmark/stresscli/commands/metrics.py
+++ b/evals/benchmark/stresscli/commands/metrics.py
@@ -85,7 +85,7 @@ def start_collecting_data(self, namespace, services, output_dir="/data", restart
                 pod_port = self.get_pod_port(pod_info)
                 metrics = self.collect_metrics(pod_ip, pod_port, metrics_path)
                 if metrics:
-                    pod_output_path = os.path.join(output_dir, f"{service_name}_{pod_name}_{timestamp}.txt")
+                    pod_output_path = os.path.join(output_dir, f"{service_name}@{pod_name}_{timestamp}.txt")
                     logging.debug(f"Writing metrics to {pod_output_path}")
                     with open(pod_output_path, "w") as f:
                         f.write(metrics)
diff --git a/evals/benchmark/stresscli/commands/metrics_docker.py b/evals/benchmark/stresscli/commands/metrics_docker.py
index fd43eb2a..052b964d 100644
--- a/evals/benchmark/stresscli/commands/metrics_docker.py
+++ b/evals/benchmark/stresscli/commands/metrics_docker.py
@@ -76,7 +76,7 @@ def start_collecting_data(self, services, output_dir="/data"):
         for container_name in services:
             metrics = self.collect_metrics(container_name)
             if metrics:
-                output_path = os.path.join(output_dir, f"{container_name}_{timestamp}.txt")
+                output_path = os.path.join(output_dir, f"{container_name}@{timestamp}.txt")
                 logging.debug(f"Writing Docker metrics to {output_path}")
                 with open(output_path, "w") as f:
                     f.write(metrics)
diff --git a/evals/benchmark/stresscli/commands/metrics_util.py b/evals/benchmark/stresscli/commands/metrics_util.py
index 1763eea5..73b17a95 100644
--- a/evals/benchmark/stresscli/commands/metrics_util.py
+++ b/evals/benchmark/stresscli/commands/metrics_util.py
@@ -116,8 +116,8 @@ def calculate_diff(start_dir, end_dir, output_dir, services=None):
         services = [services]
 
     for service_name in services:
-        # Create a regex pattern to match files starting with the service_name followed by a non-alphanumeric character
-        pattern = rf"^{re.escape(service_name)}[^a-zA-Z].*\.txt$"
+        # Create a regex pattern to match files starting with the service_name followed by symbol @
+        pattern = rf'^{re.escape(service_name)}@.*\.txt$'
 
         start_service_files = [f for f in start_files if re.match(pattern, f)]
         end_service_files = [f for f in end_files if re.match(pattern, f)]