You can generate simple bar charts directly from a MySQL prompt that look like this...

+-------+-----------------------+-----------------------------------------------+
| Month | Uptime                | Latency                                       |
+-------+-----------------------+-----------------------------------------------+
| Jan   | %%%%%%%%%%%%%%%%%%%%% | ####################                          |
| Feb   | %%%%%%%%%%%%%%%%%%%   | ##############################                |
| Mar   | %%%%%%%%%%%%%%%%%%%%  | #########################################     |
| Apr   | %%%%%%%%%%%%%%%%%%%%% | #####################                         |
| May   | %%%%%%%%%%%%%%%%%%%%% | ###############                               |
| Jun   | %%%%%%%%%%%%%%%%%%    | ############################################# |
| Jul   | %%%%%%%%%%%%%%%%%%%%% | ################################              |
| Aug   | %%%%%%%%%%%%%%%%%%%%% | …