[chore] Set bool config param to accept only true/false - compat breaking

Author: kthui

README.md

@@ -307,11 +307,11 @@ or left empty (false by default) in [model.json](https://github.com/triton-infer
 *Note:* vLLM metrics are not reported to Triton metrics server by default
 due to potential performance slowdowns. To enable vLLM model's metrics
 reporting, please add following lines to its config.pbtxt as well.
-```bash
+```
 parameters: {
   key: "REPORT_CUSTOM_METRICS"
   value: {
-    string_value:"yes"
+    string_value: "true"
   }
 }
 ```

ci/L0_backend_vllm/metrics_test/test.sh

@@ -98,14 +98,14 @@ parameters: {
 " >> models/vllm_opt/config.pbtxt
 run_test VLLMTritonMetricsTest.test_vllm_metrics_disabled
 
-# Test vLLM metrics reporting with parameter "REPORT_CUSTOM_METRICS" set to "yes" in config.pbtxt
+# Test vLLM metrics reporting with parameter "REPORT_CUSTOM_METRICS" set to "true" in config.pbtxt
 copy_model_repository
 cp ${SAMPLE_MODELS_REPO}/vllm_model/config.pbtxt models/vllm_opt
 echo -e "
 parameters: {
   key: \"REPORT_CUSTOM_METRICS\"
   value: {
-    string_value:\"yes\"
+    string_value: \"true\"
   }
 }
 " >> models/vllm_opt/config.pbtxt
@@ -120,7 +120,7 @@ echo -e "
 parameters: {
   key: \"REPORT_CUSTOM_METRICS\"
   value: {
-    string_value:\"yes\"
+    string_value: \"true\"
   }
 }
 " >> models/vllm_opt/config.pbtxt
@@ -134,7 +134,7 @@ echo -e "
 parameters: {
   key: \"REPORT_CUSTOM_METRICS\"
   value: {
-    string_value:\"yes\"
+    string_value: \"true\"
   }
 }
 " >> models/vllm_opt/config.pbtxt
@@ -146,7 +146,7 @@ echo -e "
 parameters: {
   key: \"REPORT_CUSTOM_METRICS\"
   value: {
-    string_value:\"yes\"
+    string_value: \"true\"
   }
 }
 " >> models/vllm_opt/config.pbtxt

src/model.py

@@ -236,7 +236,7 @@ def init_engine(self):
     def _get_bool_config_param(self, param_name: str) -> bool:
         return (param_name in self.model_config["parameters"]) and (
             self.model_config["parameters"][param_name]["string_value"].lower()
-            in ["yes", "true"]
+            == "true"
         )
 
     def setup_lora(self):