What will you do if the delivered message is not displayed?

First, I will check the sender application's logs for successful message sending and absence of errors.

Then, I will check the receiver application's logs for message reception and any errors during processing.

If message brokers are used (e.g., Kafka, RabbitMQ), I will review their metrics and logs to ensure successful delivery from sender to broker and from broker to receiver. I will verify that the topic/queue exists and that the consumer is subscribed to it.

I will review network configurations and firewalls between the sender, broker, and receiver to exclude traffic blocking.

If the message should appear in the user interface, I will check:

• Frontend logs for errors when receiving or displaying data.
• API requests from Frontend to Backend for success and data correctness.
• Database logs if the message needs to be stored before display.

In distributed systems, I use tracing tools (e.g., Jaeger, Zipkin) to track the full message path across various services.

I will try to reproduce the problem in a test environment using the same data and conditions.

If the message has a complex structure, I will check its format and content for parsing or validation errors on the receiver side.

I will refer to the message handling documentation in the system to understand the expected flow and possible failure reasons.

If necessary, I will use system monitoring tools (e.g., Prometheus, Grafana) to analyze resource load, network activity, and other metrics that may indicate a problem.

If the issue is not resolved, I will involve developers for a deeper code analysis and root cause elimination.