feat(nextjs): Record cache spans for use cache functions - #24302
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First merge: #24301
use cachereads and writes are invisible in traces. This wrapsget/seton Next's cache-handler registry (@next/cache-handlers-map, plus the dev-only private handler) withcache.get/cache.putspans.Decisions:
cache.hitmirrors Next: entries pastexpirecount as misses. Tag discards stay hits (undetectable at the handler).cache.item_age,cache.ttl, andcache.tags. The first and last are pending sentry-conventions upstreaming.globalThis(the module loads once per bundle). Both initorderings work:next startand dev server.Related to #12888. But the legacy incremental cache (fetch/ISR) stays uncovered.
Cache Fill

Cache Get

Closes #24289