Is there a way to alert on VSS writer state?
for instance when the "Microsoft Exchange Writers" on an Exchange server goes into a "Retryable Error" state
You could cheat and make an alert specific to the node, then the service, and then have the state for when an alter is triggered be anything other than up.
This page is an awesome cheat sheet for them: pc -- six demon bag
So your alert would say: On node X, if service "MSExchangeIS" is in a state other than up - send me an alert.