If we have access to a collaborative spreadsheet tool such as Google Docs or an internal wiki, we should maintain this information there. Not only does this act as a central resource but it ensures that all monitors have a logical reason to exist and have a predetermined escalation path. When problems arise, any time spent on deciding what to do or who to inform only serves to increase the overall amount of risk.
In the rare instance that management or business interests question our system monitoring policies, we have an immediate answer. As DBAs, we want our company to know that the database is in good hands, and a strict monitoring policy helps accomplish this.
