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Allow connectionString to be overridden multiple times without restarting the AppInsights Agent

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Issue 类型
功能
描述清晰度
基本清楚
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停滞
技术栈
java, spring-boot
领域
observability

调研方向

先从 BytecodeUtilImpl.java 的第 70-73 行附近开始，了解为什么 ConnectionString.configure() 目前只执行一次，然后检查 InheritedConnectionStringSpanProcessor.java 的第 58-62 行附近以及链接的 connection string 覆盖文档。追踪 connection string 如何与 span 和 telemetry 目标关联。完成的要求是提出一种受支持的设计，使应用程序生命周期期间能够更改目标，或为不同的自定义 span 更改目标。

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描述

Needs: Attention :wave:

Is your feature request related to a problem? Please describe.
As per your documentation, it's possible to override connection strings per each httpPathPrefix:
https://learn.microsoft.com/en-us/azure/azure-monitor/app/java-standalone-config#connection-string-overrides-preview

{
  "preview": {
    "connectionStringOverrides": [
      {
        "httpPathPrefix": "/myapp1",
        "connectionString": "..."
      },
      {
        "httpPathPrefix": "/myapp2",
        "connectionString": "..."
      }
    ]
  }
}

This config is being processed in the following class of AppInsights Agent: InheritedConnectionStringSpanProcessor.java:L58-L62

I understand that this feature is geared towards a use-case where an app being instrumented with AppInsights is an MVC app, and a connectionStringOverride is applied at a Controller method level, where each Controller method has a different PathPrefix. I.e. this use-case is described in OpenTelemetryAPI documentation as creating a custom span per controller method:
https://opentelemetry.io/docs/instrumentation/java/manual/#create-spans

Describe the solution you would like
We are looking for a way to change connectionString multiple times throughout application lifecycle, not per httpPathPrefix

Ideally we would be able to run ConnectionString.configure() and change to a desired connectionString, and ApplicationInsight agent taking that into account, and posting metrics to a newly specified location.

com.microsoft.applicationinsights.connectionstring.ConnectionString.configure(CONNECTION_STRING)

Currently ConnectionString.configure(CONNECTION_STRING) can be run only once to set ConnectionString:
https://github.com/microsoft/ApplicationInsights-Java/blob/main/agent/agent-tooling/src/main/java/com/microsoft/applicationinsights/agent/internal/classicsdk/BytecodeUtilImpl.java#L70-L73

We need a way to determine custom OpenTelemetry spans, and have a different ConnectionString per each of these spans.

Describe alternatives you have considered
Describe any alternative solutions or features you've considered.

Additional context
Our app is not Spring MVC app that has different httpPathPrefix, but is rather a SpringBoot cron-executed org.springframework.boot.CommandLineRunner task, that runs periodically, and needs to send AppInsights telemetry to 3 different AppInsights containers.

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