Negative value triggering email alert

[ms298]

Hello

I am using the Percona templates/script for monitoring disk space on a Linux box via SSH.

When it cannot connects it fails and logs the result as -1

A side thought: should Percona be logging it differently to signify a 'no result' result?

More importantly though, this triggers an email because my remaining free space has dropped below it's threshold to -1!

I'm trying to find out how to stop this, can I set up thold so it only triggers if say: value > 0 AND value < low threshold ?

Thanks all