Azure Functions V3 ILogger using DI - messages from logger not in traces - azure

Question

In my Azure Function I am trying to log using the DI container; however I am unable to get the logger to display messages in the Log Stream or the Traces in Application Insights. I have created a minimal code sample project which I am testing using the Azure Portal (Code + Test) shown here.
I've tried using Serilog same result.
I've tried removing the log parameter from Function1 - then I get no errors nor messages
I assume I'm missing something simple/obvious but I'm stuck.
namespace LoggingApiTest {
public class Function1 {
private readonly ILogger<Function1> logger;
public Function1(ILogger<Function1> logger)
{
this.logger = logger;
logger.LogInformation("In Function1 ctor using DI created Logger");
}
[FunctionName("Function1")]
public IActionResult Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = "Test")] HttpRequest req,
ILogger log) {
logger.LogInformation("Hello from DI Logger");
log.LogInformation("Hello from logger passed as parameter");
return new OkObjectResult("Hello");
}
}
}
startup
namespace LoggingApiTest {
public class Startup : FunctionsStartup {
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services.AddLogging();
}
}
}
host.json
enter code here{
"version": "2.0",
"logging": {
"applicationInsights": {
"samplingSettings": {
"isEnabled": true,
"excludedTypes": "Request"
},
"logLevel": {
"default": "Information"
}
}
}
}
The LogStream shows 2021-07-16T12:59:50.705 [Information] Executing 'Function1' (Reason='This function was programmatically called via the host APIs.', Id=b8238346-7ff7-450d-a7f0-abc8f1a210fa) 2021-07-16T12:59:50.705 [Information] Hello from logger passed as parameter 2021-07-16T12:59:50.705 [Information] Executed 'Function1' (Succeeded, Id=b8238346-7ff7-450d-a7f0-abc8f1a210fa, Duration=1ms)

Answer 1

In your logging section of your host.json file, try adding your solution namespace with the logLevel. This should enable logging at a logLevel of Information and above.
{
"version": "2.0",
"logging": {
"logLevel": {
"LoggingApiTest": "Information"
}
}
}
https://github.com/Azure/azure-functions-host/issues/4425#issuecomment-492678381