SLIs and SLOs are two paradigms that were brought to the computer science world by Google. They are defined in the SRE workbook
(https://landing.google.com/sre/sre-book/chapters/service-level-objectives/) and are an excellent way to measure actionable items within your computing system. These measurements normally follow Google's four golden signals:
- Latency: The amount of time a request takes to complete (usually measured in milliseconds)
- Traffic: The volume of traffic that your service is receiving (usually measured in requests per second)
- Errors: The percentage of failed requests over total requests (usually measured with a percentage)
- Saturation: The measure of hardware saturation (usually measured by queued request counts)
These measurements can then be used to create one or more SLAs. These are frequently delivered to customers...