feat: Add PoC of sglang metrics server (default port 30000)

Author: rmccorm4

components/src/dynamo/sglang/main.py

@@ -9,7 +9,7 @@
 
 import sglang as sgl
 import uvloop
-from sglang.srt.utils import get_ip
+from sglang.srt.utils import get_ip, launch_dummy_health_check_server
 
 from dynamo.llm import ModelInput, ZmqKvEventPublisher, ZmqKvEventPublisherConfig
 from dynamo.runtime import DistributedRuntime, dynamo_worker
@@ -65,6 +65,10 @@ async def init(runtime: DistributedRuntime, config: Config):
     server_args, dynamo_args = config.server_args, config.dynamo_args
 
     engine = sgl.Engine(server_args=server_args)
+    if server_args.enable_metrics:
+        launch_dummy_health_check_server(
+            server_args.host, server_args.port, server_args.enable_metrics
+        )
 
     component = runtime.namespace(dynamo_args.namespace).component(
         dynamo_args.component