Medium-Hard Analyze Monitoring & Observability open_ended

How do you implement distributed tracing without modifying every service's code?

Analyze — Tests ability to break down and examine complex problems.

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This question is from the Monitoring & Observability topic (System Design).

What are Google's Four Golden Signals?

What does SLO stand for and what is it used for?

Prometheus uses a push model to receive metrics from services.

Explain the difference between a trace, a span, and a trace ID.

What is the error budget for a service with a 99.9% SLO over a 30-day period?