[Metrics] Enable sleep state metric outside of dev mode (#27867)

Signed-off-by: Mark McLoughlin <markmc@redhat.com>

vllm/v1/metrics/loggers.py

@@ -9,7 +9,6 @@ from typing import TypeAlias
 
 from prometheus_client import Counter, Gauge, Histogram
 
-import vllm.envs as envs
 from vllm.config import SupportsMetricsInfo, VllmConfig
 from vllm.distributed.kv_transfer.kv_connector.v1.metrics import (
     KVConnectorLogging,
@@ -395,7 +394,7 @@ class PrometheusStatLogger(AggregateStatLoggerBase):
         self.gauge_scheduler_waiting = make_per_engine(
             gauge_scheduler_waiting, engine_indexes, model_name
         )
-        if envs.VLLM_SERVER_DEV_MODE:
+
         gauge_engine_sleep_state = self._gauge_cls(
             name="vllm:engine_sleep_state",
             documentation=(
@@ -1052,9 +1051,6 @@ class PrometheusStatLogger(AggregateStatLoggerBase):
             self.gauge_lora_info.labels(**lora_info_labels).set_to_current_time()
 
     def record_sleep_state(self, sleep: int = 0, level: int = 0):
-        if not envs.VLLM_SERVER_DEV_MODE:
-            return
-
         awake = 1
         discard_all = 0
         weights_offloaded = 0