Primary tabs

Master controls for all entities
By enabling and disabling items here, it is possible to control which entities (e.g. nodes, taxonomy terms) and bundles (e.g. content types, vocabularies) will have the meta tag form available on their respective edit pages. If an entity type is disabled it also disables it for all of that entity type's bundles.
Technical note: Entity types must not be configuration entities and must have view modes in order to be compatible.
Additional settings
When the current page includes a pager, e.g. the URL contains "?page=42", the [current-page:pager] token may be added to a meta tag to differentiate between two pages that would otherwise have the same meta tags. The value "PAGER" (must be in uppercase) will be replaced by the actual page count. Note: the pager will only output if the page number is 2 or above and the string "page=NUMBER" is in the URL.
For best use, it may be worthwhile to add the [current-page:pager] to the page title to the left of the site name, to the start of description tags, etc.
By default Metatag's summary tokens are added to long text fields. Enabling this option will also add summary tokens for all plain text fields.
How long each of the summary tokens will be after it is truncated.
Internationalization options
Additional options are available when using the Internationalization module.
If the i18n_string module is enabled but the site does not need to translate Metatag strings, the integration may be disabled to avoid a large volume of records being added to the translation system.
Optionally translate the final page output.
Optionally log to Watchdog any changes that happen.