SRE fundamentals 2021: SLIs vs SLAs vs SLOs
I thought this was a really good breakdown of the difference between these acronyms. Definitely 101 level, with info like:
"...because of the principle that availability shouldn’t be much better than the SLO, the availability SLO in the SLA is normally a looser objective than the internal availability SLO. This might be expressed in availability numbers: for instance, an availability SLO of 99.9% over one month, with an internal availability SLO of 99.95%. Alternatively, the SLA might only specify a subset of the metrics that make up the internal SLO."
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