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SLI, SLO and SLA

What are SLIs, SLOs and SLAs? 

Service Level Indicators (SLIs) are metrics that you choose to measure the health and performance of your services. Service Level Objectives (SLOs) are the desired target for those indicators. Service Level Agreements (SLAs) build on this and include the consequences of not meeting those targets. All are fundamental to Site Reliability Engineering.

In this post, I’ll try to explain each in more detail, how they relate to each other, and some examples of each.

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Book chapter summary: Postmortem Culture, from the SRE Book

I’m really enjoying reading¬†the excellent “SRE Book“. Chapter 15 “Postmortem Culture: Learning from Failure” in particular, really struck a chord with me. The following is a slightly summarized version of it.

TLDR: Failures are inevitable, especially in distributed systems. To learn from them, document in Postmortems, avoiding blame, and share the newly gained learnings across your org.

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