Availability Modeling
Availability is one of the most important aspects of every service. The failure of a critical service can result in the unavailability of the final application for end-users, thus promptly impacting the company's revenue. That is why businesses usually care about availability more than other aspects of a service such as consistency, and in the trade-off between these two, under the CAP theorem , they usually favor availability. Being of utmost importance, it is critical for distributed systems and site reliability engineers to understand how their design or operational decisions affect availability of their service.