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Progress tracking for blockchain syncing.


The amount of time between progress logs.
The number of blocks we consider to be close to the tip.
The minimum number of extra blocks mined between updating a checkpoint list, and running an automated test that depends on that list.
Skip slow sync warnings when we are this close to the tip.
The number of fractional digits in sync percentages.


Logs Zebra’s estimated progress towards the chain tip every minute or so.