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We see certain hosts submitting invalid data into alfred.
This data makes alfred-json emit a warning twhich in turn triggers cron emails.
The PR adds a simple blacklist functionality to ignore those hosts. This way do not have to suppress all all output from cron json and therefore still receive notifications about other problems.
The patch could use some cleanup which I will perform if I get a general positive feedback.
cc: @christf @oszilloskop @MyIgel