playbook/antigravity-awesome-skills/skills/vercel-optimize/references/support-topics/observability-events-cost-attribution.md

id	title	status	candidateKinds	frameworks	priority	citations	maxBriefChars
observability-events-cost-attribution	Observability Events cost attribution	active	observability_events_attribution	*	92	https://vercel.com/docs/observability/observability-plus https://vercel.com/docs/alerts	900

Investigation Brief

Observability Events is the metered SKU under Observability Plus. When the current bill shows a large Observability Events share, event volume is the lever. Reduce upstream: lift cache hit rate, narrow middleware matchers, and reduce unnecessary custom-span cardinality.

Evidence To Check

Verify the share from usage.services. Cross-reference requestsByRouteCache, middlewareCount, external API span counts, and third-party tracing (tracesSampleRate=1).

Do Not Recommend When

Skip below 15% share. Skip when cache hit rate is already >90% across hot routes — the lever is elsewhere. Do not propose sampling unless the specific metered signal has a documented sampling control.

Verification

Name the share, upstream drivers, and concrete remediation per driver, not generic "reduce events".