Kafka broker connection failure issues when doing k6 testing

[dev2021-ctrl]

Description
Getting an error when producing messages at a high rate and sending 30k messages using k6 load testing scripts within span of 30 seconds to Kafka using Docker, and getting a broker error.
Attached is the php script that is called at a high rate by k6 scripts

prod.txt

Please let me know if more debugging logs required.
Facing this issue since 1 week.Please help at the earliest by providing some solution

Will share the docker files if needed.

Error

rdkafka#producer-2834| [thrd:kafka:9092/bootstrap]: kafka:9092/bootstrap: Failed to connect to broker at kafka-3.7.kafka-producer-k6-test_default:9092:  
ll (after 12ms in state CONNECT)

Please provide the following information:

• librdkafka version: 1.6.0
• Apache Kafka version: 3.7.0
• Operating system: Debian 11

Basiclaly I am using docker and above are the versions

[dev2021-ctrl]

Any updates please very urgent facing this issue in prod too.