Reliability Engineering

Reliability planning is most effective when it starts during design, not shortly before release. This post focuses on how Service Level Objectives (SLOs) and Service Level Indicators (SLIs) can be used early in the SDLC to guide architecture and delivery choices. Remind me what they are again SLI - Service Level Indicator A quantitative metric for a service’s performance, as experienced by the user of the service. It is a measure of a property of the service that is a good proxy for your user experience. ...

In event-driven systems, services often need to update local state and publish an event for other services. Doing these as separate operations introduces a consistency risk known as the Dual Write Problem. The core requirement is simple: the database write and event publication should represent one logical change. If one succeeds and the other fails, downstream systems may observe incomplete state. The Transactional Outbox Pattern is a practical way to address this in many microservice architectures. ...