Have you had to analyze errors from prod or test — how was this process usually conducted?

Yes, I have had to troubleshoot errors from production and test environments. Usually, the process looked like this:

1. Gathering information about the error — logs, exception messages, stack traces.
2. Reproducing the error in a test environment, if possible, to understand the conditions under which it occurs.
3. Analyzing the code and data related to the error to identify the cause.
4. If necessary — consulting with colleagues or developers who wrote the problematic code.
5. Developing and testing a fix.
6. Deploying the fix and monitoring to ensure the error is resolved.

Quick response and thorough documentation of the process were important to prevent recurrence of errors.