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A warning email is sent when sufficient data loss is detected (> 0.5%). The warning email will read
Error threshold: 0.5%
which is confusing (e.g. see https://lists.wikimedia.org/hyperkitty/list/data-engineering-alerts@lists.wikimedia.org/message/2NYADKYECMNPDRAN4UJGCHSOBFFJ6IEY/).
Replace "Error" with "Warning".