[LLM] First commit the llm deployment code

fastdeploy/metrics/work_metrics.py

@@ -0,0 +1,51 @@
+"""
+# Copyright (c) 2025 PaddlePaddle Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""
+
+"""
+metrics
+"""
+import os
+import atexit
+import shutil
+from threading import Lock
+
+from prometheus_client import Histogram
+
+
+class WorkMetricsManager(object):
+    """Prometheus Metrics Manager handles all metric updates """
+
+    _initialized = False
+
+    def __init__(self):
+        """Initializes the Prometheus metrics and starts the HTTP server if not already initialized."""
+
+        if self._initialized:
+            return
+
+        self.e2e_request_latency = Histogram(
+            'fastdeploy:e2e_request_latency_seconds',
+            'End-to-end request latency (from request arrival to final response)',
+            buckets=[
+                0.3, 0.5, 0.8, 1.0, 1.5, 2.0, 2.5, 5.0, 10.0, 15.0, 20.0, 30.0,
+                40.0, 50.0, 60.0, 120.0, 240.0, 480.0, 960.0, 1920.0, 7680.0
+            ]
+        )
+
+        self._initialized = True
+
+
+work_process_metrics = WorkMetricsManager()