Add FLAGS_EVALUATION metric#401
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Adds aggregated flag-evaluation telemetry: a new
FLAGS_EVALUATIONingest event that buckets evaluations by flag/variant/reason/clientName and reports acountper bucket, alongside aclientNameoption for the Vercel Flags client. The usage tracker is refactored into dedicated event types (flags-config-read,flags-evaluation) with aBetterWeakMapfor per-request-context dedup, and the ingest path gains retry/aggregation handling.It also hardens batch flushing: the scheduled flush now awaits the full ingest send (incl. retries) so the
waitUntilpromise no longer resolves before in-flight batches complete, a 60s max flush window is added alongside the existing 5s idle window so batches still flush under continuous traffic, andshutdown()drains any pending flush instead of orphaning it. Repeated evaluations of the same bucket increment the aggregatedcountwithout counting toward the 50-event batch threshold. Covered by new black-box, scheduler, and usage-tracker tests; docs and changesets updated.🤖 Generated with Claude Code