docs(migration): Document low-cardinality http.server span names - #23598
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Adds the `http.server` row to the v11 span name section and calls out that `tracesSampler` and `ignoreSpans` can no longer match on span name — they run at span start, before a route exists, so name-based rules stop matching silently. Also points the port-span-names skill at this file: the pageload port wrote to the root MIGRATION.md, which has been superseded for v11 content. Fixes #23527 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Adds the
http.serverrow to the v11 span name section and calls out thattracesSamplerandignoreSpanscan no longer match on span name — they run at span start, before a route exists, so name-based rules stop matching silently. Stacked on #23597.Fixes #23527