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## Problem In a batch, `pageserver_layers_per_read_global` counts all layer visits towards every read in the batch, since this directly affects the observed latency of the read. However, this doesn't give a good picture of the amortized read amplification due to batching. ## Summary of changes Add two more global read amp metrics: * `pageserver_layers_per_read_batch_global`: number of layers visited per batch. * `pageserver_layers_per_read_amortized_global`: number of layers divided by reads in a batch.