Azure Functions Reliability and Availability Basics

When we host software in the cloud, it’s absolutely critical that we get a reasonable level of availability and reliability. Availability refers to the ability of a system, service, or resource to be accessible and usable when needed. It measures the percentage of time that a system or service is operational and can respond to requests. High availability means that the system is consistently accessible and minimizes downtime.

Reliability, on the other hand, focuses on the consistency and predictability of system behavior over time. It refers to the ability of a system or service to perform its intended function without failure or errors. Reliability is often measured by metrics such as mean time between failures (MTBF) or mean time to failure (MTTF), which estimate the expected time until the system encounters a failure.