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ref https://linear.app/tryghost/issue/ONC-217/implement-the-deliverytime-option-in-mailgun-api-calls Ghost experiences its highest peak load immediately after sending out a newsletter, as it recieves an influx of traffic from users clicking on the links in the email, a burst of email analytics events to process from mailgun, and an increase in organic traffic to the site's frontend as well as the admin analytics pages. The `BatchSendingService` currently sends all the batches to Mailgun as quickly as possible, which may contribute to higher peak loads. This commit adds a `deliverytime` parameter to our API calls to Mailgun, which allows us to specify a time in the future when we want the email to be delivered. This will allow us to moderate the rate at which emails are delivered, and in turn that should moderate the peak traffic volume that Ghost receives in the first 2-3 minutes after sending an email. The `deliverytime` is calculated based on a configurable parameter: `bulkEmail.targetDeliveryWindow`, which specifies the maximum allowable time (in milliseconds) after the email is first sent for Ghost to instruct Mailgun to deliver the emails. Ghost will attempt to space out all the batches as evenly as possible throughout the specified window. For example, if the targetDeliveryWindow is set to `300000` (5 minutes) and there are 100 batches, Ghost will set the `deliveryTime` for each batch ~3 seconds apart. |
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