Append Service Metrics #318
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…ge that allows tracking of disk usage across file-backed appendBuffers
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Adds a prometheus collector implementation to the broker/client package that allows tracking of disk usage across file-backed appendBuffers.
If AppendRPCs are retrying, or taking longer than normal, users can timeout waits on the
AsyncAppendand alert on the rate of these timeouts to indicate that there is potential unhealthiness in the write path. While this is happening its useful to see the amount of data that the producers have buffered on disk. Given limited disk resources this is the key indicator for how much time the operator has to resolve any issues before there are real availability issues / data loss.This change is