Both the commerce 1 discounts and discount_offer need a migration. Note that discounts are added as order items in D8, so it needed as part of line item migrations.
The source has discounts, discount offers and discount usage. These become promotions with a plugin for the type/details of the promotion.
Do not use field migrations for the fields on discounts. While nice to conform, some of these fields (date and one of the entityreferences) have settings that cause failures with core field migrations so let's just avoid that. Plus the promotion is a very different entity, so let's just migrate the values.
The migration yml has all the fields.
Skip discounts in C1 that do not map to a C2 promotion. These are
Migration working for non-shipping discounts
Investigate shipping discounts and then decide what to do next here.
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Needs review
4.0
Drupal Commerce 1.x
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