Your question is Mask PII in Error Logs. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Describe the implementation of masking PII keywords while logging cloud-related API errors, preferably using log4net.
Explain where masking occurs, how you identify PII in structured and unstructured exception data, and how you prevent sensitive values from reaching sinks such as Splunk, Azure Monitor, or Amazon CloudWatch. Address masking failures, performance, nested exceptions, request headers, URLs, response bodies, and verification through automated tests.