Strange files created by ServerTelemetryChannel and not deleted

[n0izynator]

Description:
Our application is using Application Insights with the ServerTelemetryChannel. However, we have observed that the channel is creating files with unexpected extensions (different from .trn) in the telemetry storage folder. These files are accumulating and are not being deleted as expected, which leads to storage bloat over time.

Expected Behavior:

• All files created by the channel should be deleted after being processed or after exceeding the retention period.

Actual Behavior:

• Files with unexpected extensions are being created.
• These files are not being deleted, leading to a potential buildup of unused files.

Impact:

• Potential performance or disk space issues in long-running applications.

Environment Details:

• Application Insights SDK version: 2.22.0
• .NET version: net8.0
• Hosting environment: RHOS