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deleted_postmeta

Fires immediately after deleting metadata for a post.

delete_postmeta

Fires immediately before deleting metadata for a post.

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delete_metadata

Deletes metadata for the specified object.

updated_postmeta

This action is documented in wp-includes/meta.php

update_postmeta

This action is documented in wp-includes/meta.php

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added_{$meta_type}_meta

Fires immediately after meta of a specific type is added.

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update_metadata

Updates metadata for the specified object. If no value already exists for the specified object ID and metadata key, the metadata will be added.

add_{$meta_type}_meta

Fires immediately before meta of a specific type is added.