SAS Environment Manager can alert when a given resource becomes unavailable, though this would depend on the Environment Manager server itself being up.
We do all our alerting using Zabbix, happy to chat if you need more information. Using the SAS9 REST API (https://github.com/analytium/sas9api) you can get alerts on all kinds of events - such as creation of a new library, tables exceeding a certain size, new groups being created in SMC, etc etc (as well as the traditional performance alerts such as high usage or server outages)
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Most IT operations departments have a standard suite of tools and dashboards for server monitoring. It would be worth checking what tools your company uses to see if they are a good fit.
The SAS Users Group for Administrators (SUGA) is open to all SAS administrators and architects who install, update, manage or maintain a SAS deployment.