osiris_writer: Track diff between writer and replica offsets #197
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This introduces a metric calculated at every batch which records the difference between the last known offset of the writer and its replicas. This can be used to observe a backlog of replication diminish, or to diagnose situations when replication is being starved out (network-wise) by high-throughput publishing. The replication diff should usually be low but, for streams seeing traffic, non-zero.
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This introduces a metric calculated at every batch which records the difference between the last known offset of the writer and its replicas. This can be used to observe a backlog of replication diminish, or to diagnose situations when replication is being starved out (network-wise) by high-throughput publishing. The replication diff should usually be low but, for streams seeing traffic, non-zero.