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Histograms recorded inside a sampled span carry trace IDs automatically, so a latency spike links to a trace that caused it. Nothing said so. Two things are documented because they were measured rather than assumed: an exemplar is kept per histogram bucket, so the bucket boundaries fixed earlier in this stack took the same workload from one reachable trace to four; and the pinned opentelemetry-exporter-prometheus drops exemplars entirely, so the path that works is an OTLP collector rather than Datasette's Prometheus exporter. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> (cherry picked from 9d066255; section numbering and cross-references adjusted to this branch's demo README, and the exemplar reference placed as a subsection of the new Metric reference in internals.rst.) Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01F2h9ANGZ7paWSpqs5DUAcG |
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