Sid
For storage space management SAP/Sybase has provided sp_thresholdaction mechanism.
This allows you to customize space usage/free thresholds and corresponding action as your site may need.
Unfortunately for metadata usage / over-usage there is no such mechanism for you to customize.
So you can pretty much write your own script(s) for the logic and schedule your job(s) accordingly.
Unlike space issue, metadata over usage in most cases is NOT a show stopper. Server will survive with some messages in ASE error log.
HTH
Avinash