[nsheridan]

SLA - correct. That’s the contract between the operator and the users which describes the penalties for not meeting agreed-upon SLO

SLO - service level objective, the stated availability (or latency or durability etc) of the service. Usually expressed as a value over a period of time (e.g 99.9% availability as measured over a moving 30 average). The SLO is measured by the SLI.

SLI - service level indicator. Simply, the direct measurement of the service (i.e metrics)

SRE - Site Reliability Engineer, usually a member of a team who is responsible for the continued availability of the service and the poor sap who gets paged when it breaches SLO or has an outage or other impactful event.