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f52673b6c1
The "ledger close time" was mis-derived and partly un-queryable: - Build vs Close Duration derived close time from the consensus.ledger_close span, which only wraps the onClose() prologue (~0.8ms live) — not the close. Repoint the close series to consensus.round (full round, live P95 ~4.8s). - The network close-time value (close_time) lived only as a span attribute, un-queryable in Prometheus and unfit as a spanmetrics label (monotonic timestamp -> unbounded cardinality). Expose it as last_close_time on the existing server_info observable gauge (native gauge, no new instrument). - Add a "Ledger Close Interval & Age" panel to ledger-operations and node-health: interval = 1/rate(ledgers_closed_total) (counter-based, scrape-independent); age = time() - (last_close_time + epoch_offset). A gauge delta is deliberately NOT used for the interval — a timestamp gauge's delta aliases to the scrape period, not the close cadence (verified live). Guardrail comments in both collector configs record why close_time must never become a spanmetrics dimension. Docs (09-reference) and the operator runbook updated to match. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>