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Implement the read path of replicated size and count by following the procedure:

Open storage engine snapshot at latest
Determine valid-as-of: read config.fast_count_metadata_store and config.fast_count_metadata_store_timestamps
Initialize metadata values from config.fast_count_metadata_store
Read oplog from valid-as-of timestamp to the end and aggregate size and count deltas of the collection's entries.

FTDC will use estimated size and count values and should skip step 4.

depends on

SERVER-121700 Create helper to aggregate oplog size and count deltas starting from a timestamp

SERVER-121921 Calculate the new size and count info for metadata checkpoint

is depended on by

SERVER-121777 Switch to accurate size and count read path for all callers

SERVER-122820 Implement readPersisted() for approximate size and count

related to

SERVER-121478 Convert FTDC metrics to OpenTelemetry