replicator
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Add histogram to track apply mutation batch size
We have apply_duration_seconds_bucket to track apply performance, however we don't track the size of mutation batches we are upserting/deleting.
@sravotto, we have both apply_deletes_total and apply_upserts_total. Is that sufficient?
@sravotto can you take a look again?
Is the main ask here to add a histogram prometheus metric and then surface it in the Grafana dash?