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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

6 questions in Observability Cost.

  1. Observability Cost advanced

    A platform's telemetry spend approaches its compute spend. Which reduction preserves diagnostic value, and which destroy it?

    2 min answer observability-costcardinalitysamplingretention
  2. Observability Cost advanced

    An observability platform's own telemetry costs have grown faster than its revenue. Which decisions reduce it without losing the ability to debug?

    2 min answer sentrygrafanatelemetry-costindexing
  3. Observability Cost advanced

    Datadog published Husky in 2022, a third-generation event store built on commodity object storage with FoundationDB holding the metadata, replacing an architecture backed by local SSDs. What forced the change, what did it buy economically, and what did it cost?

    2 min answer datadoghuskyobject-storagecolumnar
  4. Observability Cost advanced

    Telemetry is 28% of infrastructure spend on a contract billed per host and per custom metric, with 14 months left on a minimum annual commitment. The team wants to move to a self-hosted stack. Sequence the move under live traffic, and say when the saving actually starts.

    3 min answer observability costvendor exitopentelemetrycommitments
  5. Observability Cost advanced

    To stop losing the traces that matter, a team moves from 5% head sampling to capturing every span and deciding in its own collector tier, keeping 2% after the decision. Vendor ingest falls by 60%. What has the team given up, and when does that bill arrive?

    3 min answer tracingtail-samplingcollectorscross-zone
  6. Observability Cost advanced

    Your observability bill is 25% of infrastructure spend. How do you reduce it without losing the ability to diagnose incidents?

    2 min answer observabilitycostcardinalitysampling