How to get complete Log in Azure Function? - .net-core

Question

I try to get the complete log in my Azure function, including ALL the custom log I added in my code, currently I only have something like:
2020-11-28T00:56:59.614 [Information] Executing 'test-log' (Reason='This
function was programmatically called via the host APIs.',
Id=7f82a0c4-5ae9-416c-8f19-9c00722ded2f) 2020-11-28T00:56:59.848
[Information] Executed 'test-log' (Succeeded,
Id=7f82a0c4-5ae9-416c-8f19-9c00722ded2f, Duration=247ms)
Here is how I configure the azure function:
public class Startup : FunctionsStartup
{
public IConfiguration Configuration { get; private set; }
public Startup() { }
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public override void Configure(IFunctionsHostBuilder builder)
{
builder.Services
.AddMvcCore()
.AddNewtonsoftJson(jsonOptions =>
{
jsonOptions.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
});
builder.AddConfiguration((configBuilder) => configBuilder
.AddEnvironmentVariables()
.Build()
);
builder.Services.AddLogging();
Configuration = builder.GetCurrentConfiguration();
// explicitly call ConfigureServices to setup DI
ConfigureServices(builder.Services);
}
public void ConfigureServices(IServiceCollection services)
{
services.AddScoped(typeof(ILoggerService<>), typeof(LoggerService<>));
services.AddTelemetryClient(Configuration);
}
My LoggerService:
public class LoggerService<T> : ILoggerService<T> where T : class
{
private readonly TelemetryClient _telemetryClient;
private readonly ILogger<T> _logger;
// Flag: Has Dispose already been called?
bool disposed = false;
public LoggerService(
ILogger<T> logger
)
{
_telemetryClient = new TelemetryClient(TelemetryConfiguration.CreateDefault());
_logger = logger;
}
public void LogTrace(string message)
{
_logger.LogTrace(message);
}
public void LogTrace(string message, IDictionary<string, string> properties = null)
{
TrackMessage(message, LogLevel.Trace, properties);
LogTrace(message);
}
private void TrackMessage(string message, LogLevel logLevel, IDictionary<string, string> properties = null)
{
_telemetryClient.TrackTrace($"{logLevel}:{message}", properties);
Flush();
}
[...]
And My function:
public class MyFunctions : BaseFunctions
{
internal readonly ILoggerService _logger;
public POSFunctions(
ILoggerService<POSFunctions> logger
)
{
_logger= logger;
}
[FunctionName("test-log")]
public async Task<IActionResult> TestLogAsync(
[HttpTrigger(AuthorizationLevel.Function, "post", Route = null)] HttpRequest request
)
{
_logger.LogInformation("This is log");
}
And in the Configuration of my Azure function I have:
Why I can not see "This is log" in the Azure Function Log?

Answer 1

The solution was to add in the host.json file:
"logging": {
"fileLoggingMode": "always",
"logLevel": {
"default": "Information"
},
"applicationInsights": {
"enableLiveMetrics": true,
"enableDependencyTracking": true,
}
},