Asp.Net Core Log Statements Not showing up in Application Insights

Question

I am using the provided asp.net core logging and have application insights configured. I can see unhandled exceptions in application insights but I don't see things like logger.LogInformation("testing") anywhere in application insights. I do see the logs in the log stream though.

Additionally I am not seeing logs in the Visual Studio Application Insights screen. I created a hello world app which demonstrates that you don't see the logs in app insights.

https://github.com/devlife/AppInsightsSandbox

Any thoughts?

maybe some of the logs are getting delayed and this could help: learn.microsoft.com/en-us/azure/azure-monitor/app/… — egnomerator
– egnomerator, Commented May 8, 2019 at 20:06

cijothomas · Accepted Answer · 2019-05-08 22:00:20Z

4

Can you describe how did you enable ApplicationInsights for capturing ILogger? If you are in the latest beta version of the SDK, ILogger traces are captured without explicit action. But it'll only capture Warning or above level logs.

Follow this doc to configure application insights to capture different log levels. https://learn.microsoft.com/en-us/azure/azure-monitor/app/ilogger#control-logging-level

If you are not on the latest SDK, then you need to explicitly enable application insights to capture ilogger logs, as per the doc above. Here also you need to configure logging level such that LogInformation is captured.

.ConfigureLogging(
            builder =>
            {                
                builder.AddApplicationInsights("ikey");
  builder.AddFilter<Microsoft.Extensions.Logging.ApplicationInsights.ApplicationInsightsLoggerProvider>("", LogLevel.Information); // this will capture Info level traces and above.
            }

answered May 8, 2019 at 22:00

cijothomas

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4 Comments

devlife Over a year ago

I updated the question to include a hello world app showing what I did and how it didn't resolve the issue.

cijothomas Over a year ago

In the shared repro, I dont see any code enabling ApplicationInsightsLoggerProvider. Have you followed the instructions in the doc I shared?

devlife Over a year ago

It states that is only required if you're using an older SDK. ILogger logs that ApplicationInsightsLoggerProvider captures are subject to the same configuration as any other telemetry that's collected. They have the same set of TelemetryInitializers and TelemetryProcessors, use the same TelemetryChannel, and are correlated and sampled in the same way as other telemetry. If you use version 2.7.0-beta3 or later, no action is required to capture ILogger logs.

cijothomas Over a year ago

You are using 2.6.1 and hence you need to explicitly enable it. Only from 2.7.0-beta3 or higher, its done automatically.

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