Detail logging running on Console vs running in Azure Function

Clients Non-Java Clients
1

I am using Confluent.Kafka NuGet v 2.1 package with Visual Studio 2022 with .NET 8.

I have simple code to consume data from Kafka and when I run in a Console OR with an Azure Function locally on my machine, I can see all the detailed Kafka information as seen below. The Debug property of the ConsumerConfig is consumer,topic

[2025-04-30T15:22:18.803Z] %7|1746026538.802|INIT|rdkafka#consumer-1| [thrd:app]: librdkafka v2.10.0 (0x20a00ff) rdkafka#consumer-1 initialized (builtin.features gzip,snappy,ssl,sasl,regex,lz4,sasl_gssapi,sasl_plain,sasl_scram,plugins,zstd,sasl_oauthbearer,http,oidc, SSL ZLIB SNAPPY ZSTD CURL SASL_SCRAM SASL_OAUTHBEARER PLUGINS HDRHISTOGRAM, debug 0x2004)
[2025-04-30T15:22:18.813Z] %7|1746026538.812|SUBSCRIBE|rdkafka#consumer-1| [thrd:main]: Group “neo.qua.382c5bb2-1dc4-4771-8304-c5d3b1aa7fe1”: subscribe to new subscription of 1 topics (join-state init)
[2025-04-30T15:22:28.822Z] %7|1746026548.822|DESTROY|rdkafka#consumer-1| [thrd:app]: Terminating instance (destroy flags NoConsumerClose (0x8))
[2025-04-30T15:22:28.825Z] %7|1746026548.822|CLOSE|rdkafka#consumer-1| [thrd:app]: Closing consumer
[2025-04-30T15:22:28.826Z] %7|1746026548.822|CLOSE|rdkafka#consumer-1| [thrd:app]: Disabling and purging temporary queue to quench close events
[2025-04-30T15:22:28.827Z] %7|1746026548.822|CLOSE|rdkafka#consumer-1| [thrd:app]: Consumer closed

However, when I run the same code within Azure, I do not see those debug lines. It is like if the package Confluent.Kafka would only log those when a Console exist. There is no Console when running in Azure, there are loggers that allow to log information.

I would like to also see all those log details when running within an function in Azure.

Anyone can help with this?

2

What does the logging section of host.json look like? Have you turned on Application Insights? From here:

Locally, logs are printed to the console.

In Azure, query Application Insights traces to view the log messages.

3

The logging section looks like this:

“logging”: {
“applicationInsights”: {
“samplingSettings”: {
“isEnabled”: true,
“excludedTypes”: “Request”
},
“enableLiveMetricsFilters”: true
}
}

The Function App in Azure is connected to an Application Insight instance.

I have this also in Program.cs

// Application Insights isn’t enabled by default. See Guide for running C# Azure Functions in an isolated worker process | Microsoft Learn.
// builder.Services
// .AddApplicationInsightsTelemetryWorkerService()
// .ConfigureFunctionsApplicationInsights();