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Add FLAGS_EVALUATION metric #401

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Add FLAGS_EVALUATION metric #401

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b3c2277
Add FLAGS_EVALUATION metric
luismeyer Jun 16, 2026
12078a6
Track variant IDs in evaluation results
luismeyer Jun 18, 2026
e2390c5
report null instead of fallback
luismeyer Jun 18, 2026
54c850e
bucket to the previous minute
luismeyer Jun 19, 2026
d677aa4
replace variant null with undefined
luismeyer Jun 22, 2026
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5 changes: 5 additions & 0 deletions .changeset/evaluation-metrics.md
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@@ -0,0 +1,5 @@
---
'@vercel/flags-core': minor
---

Add aggregated flag evaluation telemetry and a `clientName` option for the Vercel Flags client.
3 changes: 2 additions & 1 deletion packages/vercel-flags-core/CLAUDE.md
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Expand Up @@ -257,7 +257,8 @@ The Controller tags all data with its origin using `tagData(data, origin)` from

### Usage Tracking

- Batches flag read events (max 50 events, max 5s wait)
- Batches flag read/evaluation events; flushes on any of: 50 distinct events, a 5s idle window (reset on every event), or a 60s max window (starts with the batch, never reset)
- The scheduled flush awaits the full ingest send (incl. retries) before its `waitUntil` promise resolves; `shutdown()` drains any in-flight batch instead of orphaning it
- Sends to `flags.vercel.com/v1/ingest`
- At runtime: deduplicates by request context (per-instance WeakSet in UsageTracker)
- During builds: deduplicates all reads to a single event (buildReadTracked flag in Controller), since there is no request context available
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