Hi, I have sample-php-app by copying file by file. Can you help please to collect trace data using 2-send-trace-to-collector.php and visualize it on SigNoz UI ? I don't know how to define env variable in Ubuntu : putenv('OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318/v1/traces'); // SigNoz OTel collector's path Thanks in advance