Observability

Metrics tell you something is wrong; logs tell you what. Grafana Loki brings Prometheus's label-based philosophy to logs — cheap to run, native to Grafana, and designed for the Kubernetes era.

Prometheus evaluates rules; Alertmanager decides who gets paged. Splitting alerting into these two parts is what makes the whole system powerful — this is the complete picture.

You can't fix what you can't see. Prometheus and Grafana are the de facto open-source stack for metrics: Prometheus collects and stores time-series data, Grafana turns it into dashboards humans actually read.

"Make the site reliable" isn't a goal — it's a wish. SLOs turn reliability into a number you can engineer toward, and error budgets turn it into a decision-making tool for the eternal speed-vs-stability argument.