I also have the same problem.
Mail Subject of Thold cannot be changed.
original subject is inconvenient because it is long. Concise Subject hopes for the change to me.
ï½¥original subject
 -Normal:
  <THRESHOLDNAME> [<DSNAME>] restored to normal threshold with value <CURRENTVALUE>
 -Warning:
  <THRESHOLDNAME> [<DSNAME>] went above threshold of <(setcount)> with <CURRENTVALUE>
ï½¥i want...
 -Normal:
  Info:<DESCRIPTION>
 -Warning:
   Warning:<DESCRIPTION>
thankyou.
(It is not so good at English.

)