What is Service Level Indicator (SLI)?
Service-Level Indicator (SLI) is a direct measurement of a service’s behavior, defined as the frequency of successful probes of our system. When we evaluate whether our system has been running within SLO for the past week
What is Service Level Objectives (SLO)?
Service Level Objectives set a goal for how well the system should behave.
Specially tracking customer experience.
If customers are happy, then the SLO is being met.
Typical SLO examples,
Uptime of 99.9% a month (i.e 43 minutes of downtime a month).
99.99% of HTTP requests in a month succeed with a 200 OK.
50% of HTTP requests returned in under 300ms.
99% of log entries processed in under 5 minutes.
What is Service Level Agreements (SLA)?
Service Level Agreement is between the client and the service provider, are typically guarantees with penalties for not meeting them.
A system can still be within its SLA and the customer can also feel very unhappy with the experience.
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