Logging ImmutableList of strings using ILogger

[perlun]

Hi,

We are logging a list of strings using the LoggerExtensions approach (logger.LogInformation) (yes - I am aware this is not optimal from a performance POV). However, when we look in our OpenTelemetry backend the data is logged there as System.Collections.Immutable.ImmutableList`1[System.String] instead of as a collection.

I tried changing these lists to normal List but it was logged similarly (System.Collections.Generic.List`1[System.String]).

This is when using the AddOtlpExporter() approach for adding the exporter (using gRPC as the protocol if this matters). An interesting note though, is that when these logs are being written to console using the AddSimpleConsole() approach in Microsoft.Extensions.Logging, the lists are properly expanded to strings using value1, value2 notation (comma-separated). 🤔 Is this an oversight in OpenTelemetry .NET or are we doing things in the wrong way?