[bug] The log generated by setting OTEL_DIAGNOSTICS.json is binary and unreadable

[domholmes]

Package

OpenTelemetry

Package Version

Package Name	Version
OpenTelemetry.Api	1.9.0
OpenTelemetry	1.9.0

Runtime Version

net8.0

Description

Creating a OTEL_DIAGNOSTICS.json in the correct place causes debug log files to be created e.g My.Project.exe.37076.log but they are unreadable

Steps to Reproduce

1. Configure a working ASP.NET core application that exports OpenTelemetary data as expected
2. Add a OTEL_DIAGNOSTICS.json file in the root of the project directory
3. Run the application and generate trace data
4. Attempt to open the log file written in the same directory

Expected Result

The log is a readable text file

Actual Result

The log is unreadable

Additional Context

{
"LogDirectory": ".",
"FileSize": 32768,
"LogLevel": "Error"
}

[xiang17]

What does the log file look like? The file is written circularly in a fixed size block. And initially it was initialized with all NUL characters, so there may seem to have a lot of garbles after the lines of readable logs at file start.