# Metering and Usage Anomalies

Identify duplicate events, missing events, and threshold misconfiguration.

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Source: https://learning.monetizekit.app/docs/troubleshooting/metering-issues
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• Duplicate events: enforce deterministic idempotency keys — see the [Usage Metering Best Practices guide](/docs/guides/metering) for idempotency key strategy.

• Missing events: confirm producer retries and endpoint status. • Threshold mismatch: validate meter key mapping and environment scope.