Some improvments have to be performed on monitoring screen (available from _admin) : 

• printed text is too long and overflows. 
• There is no obvious connection between the vocabulary used in the text and the colors. For instance, on one side it is written MAX_used, MAX_max and on the other side, it is total memory, memory used, free memory. 
• review the choice of colors in the legent
• review the number and the name of categories.