Is it possible to log to two different instances of Application Insights from the same Application?

Question

I have a web project implementing Policy Based Authorization. I have two different API'es, i want one API to log to one Instance to Application Insights, and the other API to log to another instance.

I am using log4net. I tried two different appenders, and created two different ServiceLoggers for log4net, and used dependency Injection to inject the ServiceLogger to it's respectable API Controller. In every service i used the logger in this manner var specialLogger = LogManager.GetLogger("SomeApplicationInsightAppender");

I added the instrumentation keys in every appender, and in appsettings.json i could only add one instrumentation key.

When i call the api'es, the requests get logged into one instance which is the instrumentation key in the appsettings.json, however, the normal logs using the serviceslogger i created:

Sometimes i see the log from one API correctly in the Application Insights Instance it should log to, but not the other request in the other Application Insights Instance.
Sometimes it is the other way around.

Is it a limitation in the framework to log only to one Application Insights Instance per App? Any help would be appreciated.

Tiny Wang · Answer 1 · 2020-12-04T07:33:19.747

Recently, I tried this case. I created a Springboot application with 2 Api. Hope my test will help you. Here's the code:

@RestController
public class HelloWorld {

    @RequestMapping(value="/hello")
    public String greeting() {
        TelemetryConfiguration.getActive().setInstrumentationKey("4e5xxxxd36");
        TelemetryClient telemetryClient = new TelemetryClient();
        telemetryClient.trackEvent("URI /greeting is triggered");
        return "hello";
    }
    
    @RequestMapping(value="/getUserInfo")
    public String getUserInfo() {
        TelemetryConfiguration.getActive().setInstrumentationKey("dd6xxxxaba");
        TelemetryClient telemetryClient = new TelemetryClient();
        telemetryClient.trackEvent("URI /getUserInfo is triggered");
        return "{user:zhangsan;age:16}";
    }
}

As you can see, I created 2 different TelemetryClient instances. And when I reached azure portal to see these tracks, I found the result like below:

Is it possible to log to two different instances of Application Insights from the same Application?

1 Answers1