Update README.md

Author: rathnapandi

README.md

@@ -56,7 +56,7 @@ Copy following jar files
   - [opentelemetry-sdk-logs-1.42.1.jar](https://repo1.maven.org/maven2/io/opentelemetry/opentelemetry-sdk-logs/1.42.1/opentelemetry-sdk-logs-1.42.1.jar)
   - [opentelemetry-sdk-metrics-1.42.1.jar](https://repo1.maven.org/maven2/io/opentelemetry/opentelemetry-sdk-metrics/1.42.1/opentelemetry-sdk-metrics-1.42.1.jar)
   - [opentelemetry-sdk-trace-1.42.1.jar](https://repo1.maven.org/maven2/io/opentelemetry/opentelemetry-sdk-trace/1.42.1/opentelemetry-sdk-trace-1.42.1.jar)
-- Environment variables for API Gateway to send metrics to Jaeger / any other OTLP supported vendors
+- Environment variables for API Gateway to send metrics to Jaeger
 
 ```
 export OTEL_EXPORTER_OTLP_ENDPOINT=http://10.129.61.129:4317
@@ -65,6 +65,22 @@ export OTEL_TRACES_EXPORTER=otlp
 export OTEL_SERVICE_NAME=apim-gw
 export OTEL_METRICS_EXPORTER=none
 ```
+
+- Environment variables for API Gateway to send metrics to New Relic
+
+```
+export OTEL_SERVICE_NAME=api-gw
+export OTEL_EXPERIMENTAL_EXPORTER_OTLP_RETRY_ENABLED=true
+export OTEL_EXPORTER_OTLP_METRICS_DEFAULT_HISTOGRAM_AGGREGATION=BASE2_EXPONENTIAL_BUCKET_HISTOGRAM
+export OTEL_EXPERIMENTAL_RESOURCE_DISABLED_KEYS=process.command_args
+export OTEL_EXPORTER_OTLP_ENDPOINT=https://otlp.nr-data.net
+export OTEL_EXPORTER_OTLP_HEADERS=api-key=<<license key>>
+export OTEL_ATTRIBUTE_VALUE_LENGTH_LIMIT=4095
+export OTEL_EXPORTER_OTLP_COMPRESSION=gzip
+export OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
+export OTEL_EXPORTER_OTLP_METRICS_TEMPORALITY_PREFERENCE=delta
+```
+
 - Create a file named jvm.xml under APIGATEWAY_INSTALL_DIR/apigateway/conf/
     ```xml
     <ConfigurationFragment>