Guides
All guides, page 3
Every guide on the site, most recently updated first. Each one opens with the answer, lists its sources with the day they were checked, and says when it last changed.
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Application Insights
Set the Application Insights connection string programmatically
Where the Application Insights connection string goes in code for the OpenTelemetry distros and SDK 3.x, and which setting wins.
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Application Insights
Telemetry channels: in-memory vs server channel, and the OpenTelemetry exporter
How Application Insights buffers and sends telemetry, InMemoryChannel vs ServerTelemetryChannel, Flush at shutdown, proxies, and the exporter's offline storage.
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Application Insights
Telemetry initializers in Application Insights, and their OpenTelemetry equivalents
What ITelemetryInitializer and ITelemetryProcessor do, how to add custom dimensions and role names, and the OpenTelemetry processors that replace them.
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Application Insights
Tracking users and sessions in API apps
Why user_Id and session_Id are empty for APIs, how to set them from claims and headers in the classic SDK and OpenTelemetry, and what to keep out of them.
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Application Insights
Attach version and build information to Application Insights telemetry
Set application_Version from your build in the classic SDK, SDK 3.x and OpenTelemetry (service.version), mark deployments, and compare versions in KQL.
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Application Insights
What is Application Insights? A 2026 explainer
Application Insights is the APM feature of Azure Monitor. What it collects, where the data lives, how apps send it in 2026, what it costs and when to skip it.