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2988 questions of the kind that actually get asked — in interviews, in architecture review boards, and by the person who has to run the thing at 3 AM. Every answer states the trade-off rather than the slogan, and says when the obvious choice is the wrong one.

All areas2988 Architecture Fundamentals91 Distributed Systems111 Data Architecture100 Cloud Architecture97 Networking96 API & Integration Architecture97 Reliability & Resilience99 Observability92 Performance & Capacity Engineering100 Security Architecture105 Cost Architecture & FinOps102 Business Architecture103 Architecture Communication102 Enterprise Architecture100 Legacy Modernization102 AI-Era Architecture106 Software Architecture & Engineering93 Architecture Patterns94 Architecture Decision-Making101 The Architect's Meta-Skills102 Delivery & Release Engineering103 Platform Engineering & Developer Experience102 Testing & Quality Architecture102 Data Platform Architecture98 Streaming & Real-Time Data103 Data Governance & Semantics91 Frontend & Experience Architecture101 Edge, Mobile & IoT98 Regulatory & Data Protection Architecture99 Assurance, Audit & Model Risk98
Difficulty Any beginner intermediate advanced

5 questions in Telemetry Cost.

  1. Telemetry Cost intermediate Multiple choice

    A design platform of the kind Canva runs exports 40 metrics per service. An engineer adds a `pod_name` label so a noisy pod can be identified. The service runs 600 pods and deploys twice a day, so pod names turn over completely every 12 hours. Retention is 30 days. Roughly how many distinct series does that one label create over the retention window?

    2 min answer canvacardinalitytelemetry costmetrics
  2. Telemetry Cost intermediate

    A platform's log volume has grown until log storage is one of its largest infrastructure costs. What should change, and what should not?

    2 min answer elasticlogscostindexing
  3. Telemetry Cost advanced

    A platform's observability spend has grown to a substantial fraction of its infrastructure budget with no single team responsible. What are the drivers, and how should this be controlled without losing visibility?

    2 min answer telemetry-costcardinalityretentionattribution
  4. Telemetry Cost advanced

    An observability bill has grown to a significant fraction of infrastructure spend. Diagnose it systematically and describe the reductions that do not lose diagnostic power.

    3 min answer costcardinalitysamplingretention
  5. Telemetry Cost advanced

    Your metrics platform ingests roughly 40 million samples per second and holds about 3 billion active series, the scale eBay published for Sherlock.io in 2022. A team asks to add a `customer_id` label to the request-latency histogram so they can answer per-customer questions. Estimate what that costs, and say what you would offer them instead.

    4 min answer ebaycardinalityactive seriestelemetry cost