Clean up metrics code (#1972)

test/srt/test_metrics.py

@@ -0,0 +1,63 @@
+import unittest
+
+import requests
+
+from sglang.srt.utils import kill_child_process
+from sglang.test.test_utils import (
+    DEFAULT_SMALL_MODEL_NAME_FOR_TEST,
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    popen_launch_server,
+)
+
+
+class TestEnableMetrics(unittest.TestCase):
+    def test_metrics_enabled(self):
+        """Test that metrics endpoint returns data when enabled"""
+        process = popen_launch_server(
+            DEFAULT_SMALL_MODEL_NAME_FOR_TEST,
+            DEFAULT_URL_FOR_TEST,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=["--enable-metrics"],
+        )
+
+        try:
+            # Make a request to generate some metrics
+            response = requests.get(f"{DEFAULT_URL_FOR_TEST}/health_generate")
+            self.assertEqual(response.status_code, 200)
+
+            # Get metrics
+            metrics_response = requests.get(f"{DEFAULT_URL_FOR_TEST}/metrics")
+            self.assertEqual(metrics_response.status_code, 200)
+            metrics_content = metrics_response.text
+
+            print(f"{metrics_content=}")
+
+            # Verify essential metrics are present
+            essential_metrics = [
+                "sglang:prompt_tokens_total",
+                "sglang:generation_tokens_total",
+                "sglang:max_total_num_tokens",
+                "sglang:context_len",
+                "sglang:time_to_first_token_seconds",
+                "sglang:time_per_output_token_seconds",
+                "sglang:e2e_request_latency_seconds",
+            ]
+
+            for metric in essential_metrics:
+                self.assertIn(metric, metrics_content, f"Missing metric: {metric}")
+
+            # Verify model name label is present and correct
+            expected_model_name = DEFAULT_SMALL_MODEL_NAME_FOR_TEST
+            self.assertIn(f'model_name="{expected_model_name}"', metrics_content)
+            # Verify metrics have values (not empty)
+            self.assertIn("_sum{", metrics_content)
+            self.assertIn("_count{", metrics_content)
+            self.assertIn("_bucket{", metrics_content)
+
+        finally:
+            kill_child_process(process.pid, include_self=True)
+
+
+if __name__ == "__main__":
+    unittest.main()