What actions will you take if you notice a sudden increase in API response time in a production environment?

If you notice a sudden increase in API response times in a production environment, you should:

1. Check server and application logs for errors or warnings.
2. Analyze performance metrics (CPU, memory, database load).
3. Identify which requests or operations are causing delays.
4. Check for changes in code or infrastructure that could have affected performance.
5. Roll back recent changes if necessary.
6. Use profiling and tracing to identify bottlenecks.
7. If the issue is related to the database — check indexes, locks, slow queries.
8. Inform the team and, if needed, notify users about temporary inconveniences.

It's important to act quickly to minimize impact on users.