[logback-user] how to remove old log files in this sifting appender configuration

[Andreas Kruthoff]

My %msg contains a field which specifies the hour. I found it convenient
to call MDC.put("hour", timestampHour);

The data within the messages isn't ordered by time, unfortunately, but I
want to save the data in a 'timeseries'-like manner to my output files.
All messages of hour 11 go in one file, 12 into an other, and so on. I
create such a file once per minute.

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