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What tools does .NET provide for basic application diagnostics, and what is dotnet-trace used for? How does dotnet-counters provide live performance monitoring, and what key metrics does it expose by default? What is Application Insights (or OpenTelemetry) integration, and what value does it add over basic logging? What is BenchmarkDotNet, and why is it preferred over manual Stopwatch-based timing for measuring code performance? What is the purpose of the dotnet-monitor tool, and how does it enable diagnostics in containerized/production environments? What is a memory dump, and how do you capture and analyze one for a .NET application experiencing high memory usage or a crash? What is the purpose of health check response caching and how does frequent health check polling itself impact application performance? What is the Large Object Heap (LOH), and why do objects larger than 85,000 bytes behave differently in the garbage collector? How does the dotnet-gcdump tool help diagnose managed memory leaks, and how do you analyze the resulting heap snapshot? How do EventCounters and the newer System.Diagnostics.Metrics API (Meter) let you expose custom application-specific performance metrics?
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What is the Diagnostics IPC channel, and how do diagnostic tools like dotnet-trace connect to a running .NET process without a debugger?

Beginner

Answer

Every .NET process exposes a diagnostics IPC (inter-process communication) channel automatically at startup (a named pipe on Windows, a Unix domain socket on Linux/macOS), which diagnostic tools like dotnet-trace, dotnet-counters, and dotnet-dump connect to in order to send commands and receive data -- this out-of-process design means diagnostics can be performed on a live production process without attaching an invasive debugger or restarting the application.
# List processes with an active diagnostics IPC channel
dotnet-trace ps

# Connect to a specific process and start collecting
dotnet-trace collect --process-id 1234
Real-world example An operations team runs dotnet-trace ps to discover all currently running .NET processes across a shared server, then attaches diagnostics to a specific one experiencing issues, all without any prior instrumentation or restart.

Common follow-ups: How is the diagnostics IPC channel secured against unauthorized access?;What happens if a process was started before diagnostics tools existed on the machine?

Diagnostics & Performance;CLR & Runtime
All 16 Diagnostics & Performance questions