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1eb18a6a59
Adds `consensus_view_change_total{consensus_mode}` and a `view.change` event
on the round span, both fired from `RCLConsensus::Adaptor::getPrevLedger`
on the same transition-into-WrongLedger edge that already calls
`consensusViewChange()`. The counter is the exact detector for
"consensus disagreed with this node's view this minute"; the event lands the
disagreement on the same trace that carries the round.
`net_ledger_prefix` (16 hex chars) joins `prev_ledger_prefix` on the event,
so a Tempo view of one flap shows both ledger identities on a single line.
`consensus_mode` labels the mode being left (never WrongLedger itself).
Together with the rotation-phase spans, this closes the proof chain a
rotation-driven `full`->`syncing` flap needs — the runbook's step 5
resolves now that the counter and event exist.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>