improve: Use opstatlogger for recording more details of reading from db ledger #4472
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Motivation
In order to more accurately observe the latency distribution of reading entries from the db ledger storage engine (includes: read_locations_index, read_entrylog, readahead)
Changes
read_locations_index, read_entrylog, and readahead metrics types are adjusted from Counter to OpStatsLogger.
Adjustment before and after as follows