There can be many examples of what constitutes Active / Passive monitoring. Below is one example
Consider that we have a service/process that runs in an Active/Passive scenario. We have a process and we have two servers (Active and Passive). In this scenario all that matters is that the process must be running on either one server or the other If the process is not running on either server then there should be a critical alert. Likewise if the process is running on both servers then there should also be a critical alert.
Both services down on Active and Passive server
Both services up on Active and Passive server
One service up on either Active or Passive server
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