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6eaf7316e5
The open phase ended for one of four distinct reasons, but
shouldCloseLedger() collapsed them into a bool, so a trace could say when a
phase ended and never why. "The network closed without us" and "nothing was
waiting" are the same span today.
Add whyCloseLedger(), which holds the decision and returns
LedgerCloseReason. shouldCloseLedger() keeps its exact signature and becomes
a one-line delegation, so its callers and unit tests are untouched and the
branch logic is not duplicated. phaseOpen() calls whyCloseLedger() directly;
both emit the same journal and CLOG output, so only one is called.
New attributes on consensus.phase.open, both set once on the closing tick:
close_reason anomaly | others_closed | idle | normal
proposers_validated trusted peers that had already validated the prior
ledger, reusing the value the decision was made on
Absent on the simulate() close path, which bypasses the decision rather than
having a reason invented for it.
Skipped has_open_transactions: hasOpenTransactions() is
!getOpenLedger().empty(), which is false on a quiet network for most of a
round, and close_reason=idle already implies it. The sibling
consensus.ledger_close span carries tx_count_open, which is the same fact
with a count instead of a boolean.
shouldCloseLedger() now has no production caller; it stays exported so the
public API and its tests are unchanged.
Tests pin every input vector from should_close_ledger to its literal reason,
including that the anomaly check outranks others-closed, and cover the
inclusive idle boundary either side by one millisecond.