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function sample_admin_notice__success() {
    ?>
    <div class="notice notice-warning is-dismissible">
        <p><?php _e( '!!! Ativar o rastreamento do Google quando subir o site !!!', 'sample-text-domain' ); ?></p>
    </div>
    <?php
}
add_action( 'admin_notices', 'sample_admin_notice__success' );