Both logging and metrics can be useful in such a case. Metrics are useful to get a general picture, and logging is useful when you try to find out in one speci

Both logging and metrics can be useful in such a case. Metrics are useful to get a general picture, and logging is useful when you try to find out in one specific instance what happened. If you have a billion requests per day, you likely don't want logging for retries; if you have a small number of requests, many of them important enough to investigate individual errors, you absolutely want logs on what happened to each request.