Business metrics with System.Diagnostics.Metrics: Counter, Histogram, and ObservableGauge, dimensions with controlled cardinality, dashboards in Azure Workbooks, and alerts that catch incidents before users.
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Trace the id that traverses services: OpenTelemetry in ASP.NET Core and Azure Functions Isolated Worker, exporting to Application Insights, context propagation through Service Bus, and custom spans with ActivitySource.
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Serilog correctly configured for production: the Application Insights sink, enrichers for automatic context, levels per namespace, compact request logging, and the cost traps of excessive logging.
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The three pillars of observability and the differences between them: logs answer "what happened," metrics answer "how often and how bad," traces answer "where it went through." When to use each and how they complement each other.
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Real integration tests for Cosmos DB without a production account: Local emulator and in GitHub Actions as a service container, NUnit fixture with initialization, self-signed certificates, and timing traps.
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Lost update: two processes read, modify, and save the same document — the last write overwrites the first. ETags and IfMatchEtag prevent the problem, with retry on PreconditionFailed and the Patch alternative for targeted operations.
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When you need writes in multiple regions and what price you pay: consistency levels in a multi-region context, conflict resolution with Last-Writer-Wins and custom policies, plus configuring the .NET SDK.
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Change Feed transforms the container into an event source: every insert and update becomes a trigger. Change Feed Processor in .NET, lease container, scaling across multiple instances, and practical cases.
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