【Azure 应用程序见解】在Docker中运行的ASP.NET Core应用如何开启Application Insights的Profiler Trace呢？

问题描述

使用Azure Application Insights收集AKS中ASP.NET Core应用的监控数据，自动收集请求的Trace情况，用于分析单个请求在应用内部的耗时及处理事件情况，参考Application Insights的文档，功能“Profiler Trace”可以追踪请求详情，但是在中国区的Application Insights中，确没有发现Profiler Trace功能。这里需要如何在Docker文件中配置呢？

期望结果	实际结果

那这里需要如何设置才能查看到Profiler Trace呢？

问题解决

根据示例的Docker代码，需要在构建镜像时候配置正确的Application Insights Connect String。而在文档中使用的是APPINSIGHTS_INSTRUMENTATIONKEY的方式，所以这里需要修改为APPLICATIONINSIGHTS_CONNECTION_STRING, 并且需要在其中必须包含Profiler 的Endpoint: ProfilerEndpoint=https://profiler.monitor.azure.cn/ 。

FROM mcr.microsoft.com/dotnet/sdk:3.1 AS build-env
WORKDIR /app

# Copy everything and build
COPY . ./

# Adding a reference to hosting startup package
RUN dotnet add package Microsoft.ApplicationInsights.Profiler.AspNetCore -v 2.*

# Restore & publish the app
RUN dotnet publish -c Release -o out

# Build runtime image
FROM mcr.microsoft.com/dotnet/aspnet:3.1

# Create an argument to allow docker builder to passing in application insights key.
# For example: docker build . --build-arg APPINSIGHTS_CONNECTION_STRING=YOUR_APPLICATIONINSIGHTS_INSTRUMENTATION_CONNECTION_STRING
ARG APPINSIGHTS_CONNECTION_STRING
# Making sure the argument is set. Fail the build of the container otherwise.
RUN test -n "$APPINSIGHTS_CONNECTION_STRING"

# Light up Application Insights and Service Profiler
ENV APPLICATIONINSIGHTS_CONNECTION_STRING $APPINSIGHTS_CONNECTION_STRING
ENV ASPNETCORE_HOSTINGSTARTUPASSEMBLIES Microsoft.ApplicationInsights.Profiler.AspNetCore

WORKDIR /app
COPY --from=build-env /app/out .
ENTRYPOINT ["dotnet", "EnableServiceProfilerForContainerApp.dll"]

APPLICATIONINSIGHTS_CONNECT_STRING格式如下：

InstrumentationKey=xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx;EndpointSuffix=applicationinsights.azure.cn;IngestionEndpoint=https://chinaeast2-0.in.applicationinsights.azure.cn/；ProfilerEndpoint=https://profiler.monitor.azure.cn/  

参考资料

Enable Service Profiler for containerized ASP.NET Core application：https://github.com/microsoft/ApplicationInsights-Profiler-AspNetCore/tree/main/examples/EnableServiceProfilerForContainerApp

Profile production applications in Azure with Application Insights：https://docs.microsoft.com/en-us/azure/azure-monitor/app/profiler-overview#view-profiler-data