Service Level Objectives (SLOs)
An SLO is a service level objective: a target value or range of values for a service level that is measured by an SLI. […] For example, we might decide that we will return Shakespeare search results “quickly,” adopting an SLO that our average search request latency should be less than 100 milliseconds.
Why is it Important?
To set expectations within your team and other teams about how a service should perform
To track and understand how well your service is performing
To help balance feature development and reliability improvements
When you know you are not meeting your target performance / reliability, it’s a reminder that you need to change focus from new features back to reliability improvements