Strange behavior while using compile-time logging source generation without message template

Description

When using compile-time logging source generation from Micrososft.Extensions.Logging.Abstraction version 8.0 and the message template provided:

internal static partial class LoggerExtensions
{
    [LoggerMessage(LogLevel.Critical)]
    public static partial void FoodRecallNotice(
        this ILogger logger,
        string brandName,
        string productDescription,
        string productType,
        string recallReasonDescription,
        string companyName);
}

logger.FoodRecallNotice(
    brandName: "Contoso",
    productDescription: "Salads",
    productType: "Food & Beverages",
    recallReasonDescription: "due to a possible health risk from Listeria monocytogenes",
    companyName: "Contoso Fresh Vegetables, Inc.");

The warning message seems to be confusing:

D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\Program.cs(39,16): warning SYSLIB1015: Argument 'brandNa
me' is not referenced from the logging message (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/sysl
ib1015) [D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\getting-started-console.csproj::TargetFramework
=net8.0]
D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\Program.cs(40,16): warning SYSLIB1015: Argument 'product
Description' is not referenced from the logging message (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnos
tics/syslib1015) [D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\getting-started-console.csproj::Target
Framework=net8.0]
D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\Program.cs(41,16): warning SYSLIB1015: Argument 'product
Type' is not referenced from the logging message (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/sy
slib1015) [D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\getting-started-console.csproj::TargetFramewo
rk=net8.0]
D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\Program.cs(42,16): warning SYSLIB1015: Argument 'recallR
easonDescription' is not referenced from the logging message (https://learn.microsoft.com/dotnet/fundamentals/syslib-di
agnostics/syslib1015) [D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\getting-started-console.csproj::T
argetFramework=net8.0]
D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\Program.cs(43,16): warning SYSLIB1015: Argument 'company
Name' is not referenced from the logging message (https://learn.microsoft.com/dotnet/fundamentals/syslib-diagnostics/sy
slib1015) [D:\repo\opentelemetry-dotnet\docs\logs\getting-started-console\getting-started-console.csproj::TargetFramewo
rk=net8.0]

The console output doesn't seem to be helpful:
```
crit: Program[1338249384]
```

Reproduction Steps

Check https://github.com/open-telemetry/opentelemetry-dotnet/pull/5553#issuecomment-2067316752

Expected behavior

Instead of giving 5 warnings, it'll be better to provide 1 INFO level message (e.g. "The message template is not specified; a default template will be generated"). In addition, the console logger provider should output all the key-value pairs.

Alternatively, aligning with Microsoft.Extensions.Logging.Abstraction, as described in https://github.com/open-telemetry/opentelemetry-dotnet/pull/5553#issuecomment-2067320523.

Actual behavior

User gets 5 warnings, which normally break the build due to "treat warnings as errors" setting. The console output only shows crit: Program[1338249384] without any key-value pairs.

Regression?

Known Workarounds

Provide a message template with all the key-value pairs.

Configuration

No response

Other information

No response

dotnet / runtime