Reduce memory and CPU footprint of mirroring #369
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The experimental mirroring feature used a lot of memory and CPU when put under production traffic. This change attempts to reduce memory and CPU usage.
Memory footprint is reduced by making the channel smaller. CPU usage is reduced by avoiding allocations if the channel is full or is closed.
We might lose more messages this way if the mirror falls behind but that is more acceptable than crashing the entire process when it goes out-of-memory (OOM)