The 4 golden signals of monitoring

Set SLA at the minimum customers are not repelled by your service
If SLA states that service will respond in under 300ms, then in SLO we want to say that response will be returned in under 200ms

SLA — Service Level Agreement

SLO — Service Level Objectives

SLI — Service Level Indicators

properties of good SLI metrics
top one: false positives
ways to measure SLI