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Add instanceId to pool metrics for per-instance deduplication #526

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Merged
iscekic merged 1 commit into from
Feb 24, 2026
Merged

Add instanceId to pool metrics for per-instance deduplication #526

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6 changes: 5 additions & 1 deletion src/lib/drizzle.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -108,7 +108,10 @@ if (usesSeparateReplica) {
}

// --- Pool observability ---
// Periodic pool metrics (every 30s) — picked up by Vercel log drain → Axiom
// Periodic pool metrics (every 30s) — picked up by Vercel log drain → Axiom.
// instanceId lets us deduplicate readings per instance in Axiom queries.
const instanceId = `${VERCEL_REGION ?? 'unknown'}-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;

function logPoolMetrics() {
const primary = { total: pool.totalCount, idle: pool.idleCount, waiting: pool.waitingCount };
const replica = usesSeparateReplica
Expand All @@ -121,6 +124,7 @@ function logPoolMetrics() {
console.log(
JSON.stringify({
type: 'pool_metrics',
instanceId,
region: VERCEL_REGION ?? 'unknown',
primary,
replica,
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