events/export: Document metric_export_sample_by#1539
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Adds a Sampling section to the Event Export page, settings entries for metric_export_sample_by / _field / _permille, and a stats_sample_by anchor for cross-linking. Sampling hashes a configured event field (typically session) and forwards only the fraction set by permille (parts per thousand) to the exporter, while in-process statistics counters keep counting every event. Multiple sample_by blocks combine with AND semantics.
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Adds settings entries for event_exporter_otel_endpoint / event_exporter_otel_trace_id_field / event_exporter_otel_timeout_msecs, a new OpenTelemetry section explaining trace correlation, sub-session linking via Span.Link, span timing, the required format=json quirk, and the link to the sampling section. Whitelist the new spell-check terms in .github/actions/spelling/allow.txt.
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Adds a Sampling section to the Event Export page, settings entries for metric_export_sample_by / _field / _permille, and a stats_sample_by anchor for cross-linking.
Sampling hashes a configured event field (typically session) and forwards only the fraction set by permille (parts per thousand) to the exporter, while in-process statistics counters keep counting every event. Multiple sample_by blocks combine with AND semantics.
JIRA: DOV-8702