https://apmtips.com/ Practical guides, explained KQL queries and small calculators for application performance monitoring with Azure Monitor Application Insights and OpenTelemetry. en Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/agent-based-dependency-tracking/ https://apmtips.com/application-insights/agent-based-dependency-tracking/ How the Application Insights Agent collects SQL and HTTP dependencies on IIS, when the instrumentation engine is needed, and what still needs code. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/app-service-auto-instrumentation-vs-sdk/ https://apmtips.com/application-insights/app-service-auto-instrumentation-vs-sdk/ What Application Insights auto-instrumentation collects on App Service, Functions, AKS and IIS, when to move to code, and why one collector per app is enough. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/application-insights-pricing-and-cost/ https://apmtips.com/application-insights/application-insights-pricing-and-cost/ Application Insights bills by the GB its Log Analytics workspace ingests. Current East US prices, the free allowance and retention, and what to change first. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/applicationinsights-config-explained/ https://apmtips.com/application-insights/applicationinsights-config-explained/ What ApplicationInsights.config controls, which apps still read it, and where its settings went in SDK 3.x and the Microsoft OpenTelemetry Distro. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/asp-net-mvc-and-web-api/ https://apmtips.com/application-insights/asp-net-mvc-and-web-api/ What still works for ASP.NET MVC and Web API on .NET Framework, the HTTP modules, unhandled vs handled exceptions, trace forwarding, and the SDK 3.x upgrade. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/azure-monitor-alerts-explained/ https://apmtips.com/application-insights/azure-monitor-alerts-explained/ What an Azure Monitor alert email means, metric vs log search alerts, action groups, a log alert over KQL step by step, what alerts cost, and how to stop noise. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/azure-monitor-vs-application-insights-vs-log-analytics/ https://apmtips.com/application-insights/azure-monitor-vs-application-insights-vs-log-analytics/ Azure Monitor is the platform, Log Analytics the workspace and its query tool, Application Insights the APM feature. Table names, storage, and what to query. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/certificate-expiration-and-availability-tests/ https://apmtips.com/application-insights/certificate-expiration-and-availability-tests/ Use Standard availability tests to catch expiring TLS certificates, set the lifetime check and alerts, price it, and when to use TrackAvailability instead. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/classic-sdk-vs-opentelemetry-distro/ https://apmtips.com/application-insights/classic-sdk-vs-opentelemetry-distro/ Classic Application Insights SDK status, SDK 3.x vs the Microsoft OpenTelemetry Distro, a concept map from 2.x, and the migration steps. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/client-ip-address-and-geolocation/ https://apmtips.com/application-insights/client-ip-address-and-geolocation/ Why client_IP shows 0.0.0.0, how Application Insights fills the city and country columns, how DisableIpMasking stores real IPs, and what proxies change. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/correlation-and-application-map/ https://apmtips.com/application-insights/correlation-and-application-map/ How operation_Id and operation_ParentId map to W3C trace context, why Application Map shows one node or none, and how to correlate work across queues. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/cross-resource-kql-queries/ https://apmtips.com/application-insights/cross-resource-kql-queries/ Query many apps with KQL using one workspace, workspace() and app(); find a resource from its instrumentation key; join reference data; reuse dashboards. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/custom-metrics/ https://apmtips.com/application-insights/custom-metrics/ GetMetric vs TrackMetric, OpenTelemetry counters and histograms, where custom metrics land, dimension limits, and how to query customMetrics correctly. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/desktop-and-console-apps/ https://apmtips.com/application-insights/desktop-and-console-apps/ Instrument console tools, worker services, WPF and WinForms apps with Application Insights, flush before exit, and track work without a web host. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/diagnosticsource-activity-and-opentelemetry/ https://apmtips.com/application-insights/diagnosticsource-activity-and-opentelemetry/ DiagnosticSource vs ActivitySource in .NET, how libraries emit telemetry, listening without a vendor SDK, and what Application Insights collects. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/disable-application-insights-in-development/ https://apmtips.com/application-insights/disable-application-insights-in-development/ Stop local runs from sending telemetry, for the classic Application Insights SDK, SDK 3.x and the OpenTelemetry distros, in .NET and Node.js. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/enable-live-metrics-from-code/ https://apmtips.com/application-insights/enable-live-metrics-from-code/ Turn Live Metrics on or off in code for the classic SDK, SDK 3.x and the OpenTelemetry Distro, secure it with Entra ID, and fix an empty Live Metrics pane. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/javascript-snippet-explained/ https://apmtips.com/application-insights/javascript-snippet-explained/ What the JavaScript SDK Loader Script does, loader vs npm, the connection string in the browser, linking page views to server requests, and cookie consent. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/logging-ilogger-serilog-and-traces/ https://apmtips.com/application-insights/logging-ilogger-serilog-and-traces/ How ILogger and Serilog logs reach the Application Insights traces table, which levels are sent by default, severity mapping, scopes, and what debug logs cost. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/no-data-sdk-self-diagnostics/ https://apmtips.com/application-insights/no-data-sdk-self-diagnostics/ A checklist for missing Application Insights telemetry, and how to turn on self-diagnostics in the classic SDK, SDK 3.x, OpenTelemetry and Java. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/performance-counters-and-metrics-outside-web-apps/ https://apmtips.com/application-insights/performance-counters-and-metrics-outside-web-apps/ Why CPU and memory counters go missing in console apps, services and containers, and how to collect them with the classic SDK, SDK 3.x and OpenTelemetry. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/request-name-and-url/ https://apmtips.com/application-insights/request-name-and-url/ Where request names and operation_Name come from in the classic SDK and OpenTelemetry, why 404s and static files behave oddly, and how to rename requests. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/sampling-explained/ https://apmtips.com/application-insights/sampling-explained/ Adaptive, fixed-rate, rate-limited and ingestion sampling in Application Insights, each SDK's default, counting with itemCount, and why filters skew metrics. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/send-telemetry-with-one-request/ https://apmtips.com/application-insights/send-telemetry-with-one-request/ Post a custom event or metric to Application Insights with curl or PowerShell, read the response, validate the JSON, and when to use OTLP or an SDK instead. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/set-the-connection-string-programmatically/ https://apmtips.com/application-insights/set-the-connection-string-programmatically/ Where the Application Insights connection string goes in code for the OpenTelemetry distros and SDK 3.x, and which setting wins. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/telemetry-channels-and-exporters/ https://apmtips.com/application-insights/telemetry-channels-and-exporters/ How Application Insights buffers and sends telemetry, InMemoryChannel vs ServerTelemetryChannel, Flush at shutdown, proxies, and the exporter's offline storage. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/telemetry-initializers-and-opentelemetry-processors/ https://apmtips.com/application-insights/telemetry-initializers-and-opentelemetry-processors/ What ITelemetryInitializer and ITelemetryProcessor do, how to add custom dimensions and role names, and the OpenTelemetry processors that replace them. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/tracking-users-and-sessions-in-api-apps/ https://apmtips.com/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. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/version-and-build-information-in-telemetry/ https://apmtips.com/application-insights/version-and-build-information-in-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. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/application-insights/what-is-application-insights/ https://apmtips.com/application-insights/what-is-application-insights/ 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. Guide Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/apdex-style-satisfaction-score/ https://apmtips.com/kql/apdex-style-satisfaction-score/ Score each operation from 0 to 1 by sorting requests into satisfied, tolerating and frustrated against a response-time target you set in one line. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/availability-results-by-test-and-location/ https://apmtips.com/kql/availability-results-by-test-and-location/ Success rate, run count and p95 duration for each availability test at each test location over the last 24 hours, worst first. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/availability-failures-with-messages/ https://apmtips.com/kql/availability-failures-with-messages/ List failed availability test runs from the last 24 hours with test name, location, duration and failure message, newest first. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/cloud-role-instances-and-versions/ https://apmtips.com/kql/cloud-role-instances-and-versions/ For each service, the instances and application versions that sent requests in the last 24 hours, with traffic per version and when each was last seen. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/performance-counters-cpu-and-memory-timechart/ https://apmtips.com/kql/performance-counters-cpu-and-memory-timechart/ Chart process CPU and available memory for each instance in 5-minute bins from the performanceCounters table, with notes on which counters you have. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/custom-events-by-name-timechart/ https://apmtips.com/kql/custom-events-by-name-timechart/ Chart hourly counts of your ten most frequent custom events over the last 7 days, sampling-adjusted, plus how to sum a custom measurement. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/daily-active-users-and-sessions/ https://apmtips.com/kql/daily-active-users-and-sessions/ Distinct users and sessions per day across requests and page views for the last 30 full days, charted, with notes on what the IDs measure. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/dependencies-per-request-ratio/ https://apmtips.com/kql/dependencies-per-request-ratio/ Average outgoing dependency calls per request for each operation, sampling-adjusted, to find chatty endpoints that make too many database or HTTP calls. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/dependency-failure-rate-by-type-and-target/ https://apmtips.com/kql/dependency-failure-rate-by-type-and-target/ The share of failed outgoing calls per dependency type and target over the last 24 hours, sampling-adjusted, with an example failing result code. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/dependency-duration-timechart-by-type/ https://apmtips.com/kql/dependency-duration-timechart-by-type/ Chart the p95 duration of outgoing calls per dependency type in 15-minute bins, weighted for sampling, to see which kind of call slowed down and when. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/end-to-end-trace-for-operation-id/ https://apmtips.com/kql/end-to-end-trace-for-operation-id/ Every request, dependency call, log line, exception, page view and custom event recorded for one operation, in time order, across services. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/exception-details-for-problem-id/ https://apmtips.com/kql/exception-details-for-problem-id/ Everything about one exception problem in one row: count, first and last seen, affected operations, roles and users, and messages. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/exceptions-by-type-and-operation/ https://apmtips.com/kql/exceptions-by-type-and-operation/ Count exceptions in the last 24 hours by exception type and operation, sampling-adjusted, with one outer message and the innermost type for each. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/failed-requests-by-result-code/ https://apmtips.com/kql/failed-requests-by-result-code/ Count failed requests in the last 24 hours by HTTP result code, with how many operations each code touched, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/failed-requests-with-exceptions/ https://apmtips.com/kql/failed-requests-with-exceptions/ Join failed requests to the exceptions recorded in the same operation and group them by problemId, to see which code paths cause the failures. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/failure-rate-by-operation-timechart/ https://apmtips.com/kql/failure-rate-by-operation-timechart/ Chart the failed-request percentage over time for the five operations with the most failures, in 15-minute bins, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/new-exception-types-this-week/ https://apmtips.com/kql/new-exception-types-this-week/ Exception types recorded in the last 7 days that never appeared in the 28 days before, with count, first sighting and an example message. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/noisiest-trace-messages/ https://apmtips.com/kql/noisiest-trace-messages/ The log messages that cost the most over the last 24 hours, grouped by message prefix and severity level, with billed megabytes and item counts. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/http-dependency-calls-by-target-host/ https://apmtips.com/kql/http-dependency-calls-by-target-host/ Call volume, p95 duration and failures for every host your app calls over HTTP in the last 24 hours, busiest first, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/page-views-by-name-and-country/ https://apmtips.com/kql/page-views-by-name-and-country/ The most viewed pages over the last 7 days split by the visitor's country or region, with distinct users, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/request-duration-timechart/ https://apmtips.com/kql/request-duration-timechart/ Chart the median and p95 server response time in 5-minute bins over the last 24 hours, weighted for sampling, to see when latency changed. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/request-percentiles-by-cloud-role/ https://apmtips.com/kql/request-percentiles-by-cloud-role/ Compare median, p95 and p99 request duration across the services that share one Application Insights resource, weighted for sampling, slowest first. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/requests-p50-p95-p99-by-operation/ https://apmtips.com/kql/requests-p50-p95-p99-by-operation/ Median, p95 and p99 server response time for every operation over the last 24 hours, weighted for sampling, slowest p95 first. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/requests-by-client-country/ https://apmtips.com/kql/requests-by-client-country/ Each country or region's share of server requests over the last 7 days, with p95 duration, sampling-adjusted, and what the geolocation can and can't tell you. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/requests-marked-failed-with-2xx/ https://apmtips.com/kql/requests-marked-failed-with-2xx/ Find requests recorded as failed although they returned a 2xx status, a sign of custom success logic or an exception recorded on the request. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/requests-per-day-by-cloud-role/ https://apmtips.com/kql/requests-per-day-by-cloud-role/ Daily request volume for each service sending to the resource over the last 14 full days, sampling-adjusted, as a column chart. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/requests-slower-than-threshold-by-operation/ https://apmtips.com/kql/requests-slower-than-threshold-by-operation/ Count how many requests per operation took longer than a limit you set, and what share of the operation's traffic that is, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/sampling-rate-in-effect/ https://apmtips.com/kql/sampling-rate-in-effect/ Read the effective sampling percentage for each telemetry type from itemCount, to confirm whether sampling is on and how much it keeps. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/server-errors-vs-client-errors-by-hour/ https://apmtips.com/kql/server-errors-vs-client-errors-by-hour/ Split each hour's HTTP errors into 5xx and 4xx responses, sampling-adjusted, with the operations that returned server errors in that hour. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/slowest-dependencies-by-target/ https://apmtips.com/kql/slowest-dependencies-by-target/ The 20 dependency targets with the worst p95 call duration in the last 24 hours, with call volume and failures, sampling-adjusted. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/sql-dependency-duration-by-name/ https://apmtips.com/kql/sql-dependency-duration-by-name/ Median and p95 duration and call counts for SQL dependencies, grouped by target and name rather than raw SQL text, with one example command. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/telemetry-volume-by-table/ https://apmtips.com/kql/telemetry-volume-by-table/ Billed gigabytes per Application Insights table over the last 7 full days, with stored rows, items and the daily average, to see what drives the bill. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/slowest-requests-last-hour/ https://apmtips.com/kql/slowest-requests-last-hour/ List the slowest individual requests from the last hour with operation name, duration, result code, cloud role and the operation_Id to trace each one. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/top-failing-operations-this-week-vs-last/ https://apmtips.com/kql/top-failing-operations-this-week-vs-last/ Compare failed requests per operation in the last 7 days with the 7 days before, sampling-adjusted, to see which routes got worse. KQL Wed, 21 Oct 2026 00:00:00 GMT https://apmtips.com/kql/unhandled-vs-handled-exceptions/ https://apmtips.com/kql/unhandled-vs-handled-exceptions/ Split exceptions by the handledAt value your SDK records and by whether their request failed, the practical test of whether an exception escaped. KQL Wed, 21 Oct 2026 00:00:00 GMT