Observability that pays for itself — structured logging that helps on-call, picking between metrics / logs / traces, SLO-driven alerting, and the trace-id discipline that ties everything together.
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Alerting on CPU and disk pages people for things users never notice. SLOs flip it around: define what 'working' means to a user, then spend an error budget against it.
The three pillars overlap, but they answer different questions. Putting the right signal against the right question is half the win.
Free-text logs are a write-only medium. Structured logs are searchable, correlatable, and worth half your debugging time back.