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Wire the apply-pipeline stage spans (tx.preflight, tx.preclaim, tx.transactor) added on phase-3 through the observability stack so the spanmetrics connector produces per-stage RED metrics without any native instruments. - collector: add the `stage` dimension to the spanmetrics connector so the three stages split into separate metric series (3 bounded values). - dashboard: add a "Tx Apply Pipeline" section to transaction-overview with rate, p95 latency, and failure-rate panels grouped by stage, plus a `stage` template variable. Panels follow the existing config (node filter, exported_instance legends, Title Case, axis labels). - The failure panel filters ter_result != tesSUCCESS rather than span status, because a failing ter code completes the span normally — only thrown exceptions set an error status. This matches the existing "Transaction Results by Type" panel convention. - docs: document the spans, attributes, and stage dimension in the data collection reference and runbook, including the sampling caveat that span-derived metrics inherit tracer head-sampling and undercount at sampling_ratio < 1. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>