JQMIGRATE: Migrate is installed (with logging active), version X

This is not a warning, but a console log message the plugin shows when it first loads to indicate whether warnings will be shown on the console when appropriate. Production (minified) builds will not show the "with logging active" phrase, as they do not generally show warnings and only shim functionality.

This log message ensures that developers know jQuery Migrate is in use. The use jQuery Migrate in production has performance impacts and can complicate debugging as it modifies the normal behavior of the version of jQuery that is loaded. For those reasons the Migrate plugin is best used only as a debugging aid and not as a long-term fix.