[V0 Deprecation] Remove code related to per-request logits processors (#34400)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/engine/arg_utils.py

@@ -508,8 +508,6 @@ class EngineArgs:
     reasoning_parser: str = StructuredOutputsConfig.reasoning_parser
     reasoning_parser_plugin: str | None = None
 
-    logits_processor_pattern: str | None = ModelConfig.logits_processor_pattern
-
     speculative_config: dict[str, Any] | None = None
 
     show_hidden_metrics_for_version: str | None = (
@@ -710,9 +708,6 @@ class EngineArgs:
         )
         model_group.add_argument("--hf-overrides", **model_kwargs["hf_overrides"])
         model_group.add_argument("--pooler-config", **model_kwargs["pooler_config"])
-        model_group.add_argument(
-            "--logits-processor-pattern", **model_kwargs["logits_processor_pattern"]
-        )
         model_group.add_argument(
             "--generation-config", **model_kwargs["generation_config"]
         )
@@ -1320,7 +1315,6 @@ class EngineArgs:
             mm_encoder_tp_mode=self.mm_encoder_tp_mode,
             mm_encoder_attn_backend=self.mm_encoder_attn_backend,
             pooler_config=self.pooler_config,
-            logits_processor_pattern=self.logits_processor_pattern,
             generation_config=self.generation_config,
             override_generation_config=self.override_generation_config,
             enable_sleep_mode=self.enable_sleep_mode,
@@ -1429,7 +1423,7 @@ class EngineArgs:
         self.model_weights = model_config.model_weights
         self.tokenizer = model_config.tokenizer
 
-        self._check_feature_supported(model_config)
+        self._check_feature_supported()
         self._set_default_chunked_prefill_and_prefix_caching_args(model_config)
         self._set_default_max_num_seqs_and_batched_tokens_args(
             usage_context, model_config
@@ -1831,11 +1825,8 @@ class EngineArgs:
 
         return config
 
-    def _check_feature_supported(self, model_config: ModelConfig):
+    def _check_feature_supported(self):
         """Raise an error if the feature is not supported."""
-        if self.logits_processor_pattern != EngineArgs.logits_processor_pattern:
-            _raise_unsupported_error(feature_name="--logits-processor-pattern")
-
         # No Concurrent Partial Prefills so far.
         if (
             self.max_num_partial_prefills != SchedulerConfig.max_num_partial_prefills