Activities from blocked instances remain in queue

I have noticed that the inbox queue tends to get filled up with delayed jobs like this, where the instance that is trying to send activities, is blocked. I think these should be immediately discarded.

Also this pollutes the logs a lot, which feels rather unnecessary, a configuration option to not log messages related to this or better error handling that outputs just a message saying "discarded activity from blocked instance example.com" would be greatly appreciated.