What happens to the system's availability when the mean time between failures (MTTR) inches closer and closer to zero? Availability is defined as the amount of time that elapses since the last failure. Is this a scenario that can be described in a manner that is in line with the way things really are, or not?

What are the distinguishing characteristics between Cloud Firestore and Firebase Realtime Database?

What is the actual distinction between the system space and the user space?

A machine cycle, commonly referred to as a process loop, is made up of these four individual components. Which aspects of the machine's functioning are most important and why? Should one be worried with the replacement of each individual component that makes up the machine cycle? Does the installation of a second module make it such that switching between them isn't as much of a problem?