Change log level of retry simple attempt

[sergiosimoes025]

Description

The log level of attempts of the simple retry definition is Error. Since this is a retry attempt, the log level should be Verbose.

This PR changes the log level of the retry attempt to Verbose.

Fixes #85

How Has This Been Tested?

Test the consumption of events locally, and ensure that the log level of the retry attempt is verbose.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have made corresponding changes to the documentation

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[fernando-a-marins]

I agree with you that the log level of a retry attempt in this context should be Verbose, nevertheless, when the message fails the first time, I think the log level should be Error so the users will know that something wrong is happening. What do you think about this? Here is a suggestion:

                       var logMsg = $"Exception captured by {nameof(RetrySimpleMiddleware)}. Retry in process.";

                        var logObj = new
                        {
                            AttemptNumber = attemptNumber,
                            WaitMilliseconds = waitTime.TotalMilliseconds,
                            PartitionNumber = context.ConsumerContext.Partition,
                            Worker = context.ConsumerContext.WorkerId,
                            //Headers = context.HeadersAsJson(),
                            //Message = context.Message.ToJson(),
                            ExceptionType = exception.GetType().FullName,
                            ExceptionMessage = exception.Message
                        };

                        if (attemptNumber == 1)
                        {
                            this.logHandler.Error(logMsg, exception, logObj);
                        }
                        else
                        {
                            this.logHandler.Verbose(logMsg, logObj);
                        }

[pmfccastro]

Hi ! We are also looking for this feature, but could we log the last attempt instead of the first one? If a message is retried only once and then passes, it means the issue is temporary and we don't have to deal with it, but if after all the retries we still can't consume, then we have a problem that we have to deal.

[fernando-a-marins]

After some conversation with the finance open-source team, we concluded that this PR shouldn't be merged. The users may accomplish this issue using the retry durable and using some metadata that flows in the headers of the messages. In the property IMessageContext.Headers you will find a header with the key "Kafka-Flow-Retry-Durable-Attempts-Count" that will give you the number of attempts, if zero, it means that the message is not in retry. Use that to log as you wish in your applications.