The billing plan page (US | EU, or User Menu -> "Billing & Usage") provides a Log Overage notification option. We recently updated this feature so that it alerts based on log volume as a percentage of your plan instead of a fixed value. This allows the alert to scale relative to your DataSet plan.
The feature is enabled by default for all new accounts, so please check your settings and confirm your recipient(s) are correct. Please note that the percentage threshold can be over 100%, so the number can be adjusted if a temporary increase in log volume is expected.
Please note that the log overage notification is issued when the account's average log volume from the past 24 hours exceeds the percentage threshold. Here is an example of an overages notification email.
In the above example, the account plan is 10GB/day, the ingestion volume in the last 24 hours is 15.55 GB, and the month-to-date log volume is 13.21 GB.
Since the month-to-date volume exceeds the plan's quota, an overage charge may apply if the log volume continues to exceed 10GB/day.
Please refer to the following articles for more information on how to monitor and evaluate your log volume: