fix: fix the missing metrics on non-rank0 nodes (#7720)

python/sglang/srt/utils.py

@@ -85,6 +85,8 @@ from torch.profiler import ProfilerActivity, profile, record_function
 from torch.utils._contextlib import _DecoratorContextManager
 from triton.runtime.cache import FileCacheManager
 
+from sglang.srt.metrics.func_timer import enable_func_timer
+
 logger = logging.getLogger(__name__)
 
 show_time_cost = False
@@ -2049,7 +2051,7 @@ def rank0_log(msg: str):
         logger.info(msg)
 
 
-def launch_dummy_health_check_server(host, port):
+def launch_dummy_health_check_server(host, port, enable_metrics):
     import asyncio
 
     import uvicorn
@@ -2067,6 +2069,11 @@ def launch_dummy_health_check_server(host, port):
         """Check the health of the http server."""
         return Response(status_code=200)
 
+    # Add prometheus middleware
+    if enable_metrics:
+        add_prometheus_middleware(app)
+        enable_func_timer()
+
     config = uvicorn.Config(
         app,
         host=host,