first commit

core/modules/contact/migrations/contact_category.yml

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+id: contact_category
+label: Contact category configuration
+migration_tags:
+  - Drupal 6
+  - Drupal 7
+  - Configuration
+source:
+  plugin: contact_category
+process:
+  id:
+    -
+      plugin: machine_name
+      source: category
+    -
+      plugin: make_unique_entity_field
+      entity_type: contact_form
+      field: id
+      length: 30
+  label: category
+  recipients: recipients
+  reply: reply
+  weight: weight
+destination:
+  plugin: entity:contact_form

core/modules/contact/migrations/d6_contact_settings.yml

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+id: d6_contact_settings
+label: Contact configuration
+migration_tags:
+  - Drupal 6
+  - Configuration
+source:
+  plugin: contact_settings
+  variables:
+    - contact_default_status
+    - contact_hourly_threshold
+process:
+  user_default_enabled: contact_default_status
+  'flood/limit': contact_hourly_threshold
+  'flood/interval':
+    plugin: default_value
+    # It was defaulted to 3600 in D6.
+    # @see https://api.drupal.org/api/drupal/includes%21common.inc/function/flood_is_allowed/6.x
+    default_value: 3600
+  default_form:
+    plugin: migration_lookup
+    migration: contact_category
+    source: default_category
+destination:
+  plugin: config
+  config_name: contact.settings
+migration_dependencies:
+  required:
+    - contact_category

core/modules/contact/migrations/d7_contact_settings.yml

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+id: d7_contact_settings
+label: Contact configuration
+migration_tags:
+  - Drupal 7
+  - Configuration
+source:
+  plugin: contact_settings
+  variables:
+    - contact_default_status
+    - contact_threshold_limit
+process:
+  user_default_enabled: contact_default_status
+  'flood/limit': contact_threshold_limit
+  'flood/interval':
+    plugin: default_value
+    # It was defaulted to 3600 in D7.
+    # @see https://api.drupal.org/api/drupal/includes%21common.inc/function/flood_is_allowed/7.x
+    default_value: 3600
+  default_form:
+    plugin: migration_lookup
+    migration: contact_category
+    source: default_category
+destination:
+  plugin: config
+  config_name: contact.settings
+migration_dependencies:
+  required:
+    - contact_category
+dependencies:
+  config:
+    - migrate.migration.contact_category
+  module:
+    - contact
+    - migrate_drupal

core/modules/contact/migrations/state/contact.migrate_drupal.yml

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+finished:
+  6:
+    contact: contact
+  7:
+    contact: contact