ServerTelemetryChannel stores telemetry data in default folder during transient errors in non-windows environments]

[rajkumar-rangaraj]

Fix Issue #1792

Proposal

For the application running in Linux or MacOS, ServerTelemetryChannel doesn’t automatically create a local storage folder to keep telemetry temporarily if there are network issues. Channel should be configured to use local folder to avoid telemetry data loss.

To fix this issue in non-windows environment, following folder locations have been identified to create a storage folder automatically to store telemetry data.

• ${TMPDIR}, if ${TMPDIR} environment variable is set; otherwise,
• /var/tmp if that exists; otherwise,
• /tmp if that exists; otherwise no storage folder is used.

In Windows, SDK creates a storage folder in %LOCALAPPDATA% or %TEMP% and restricts access to Current User and Administrators.

But in Non-Windows environment, we don’t manage permissions for storage folder. If your application logs confidential information that cannot be stored in above mentioned location, we strongly recommend using custom folder and restring permission to process identity of an application.

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed

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[cijothomas]

I also wonder what would happend if multiple dotnetcore apps run in same linux machine under same user? will they store in same folder and cause collision/other issues?

[rajkumar-rangaraj]

I also wonder what would happend if multiple dotnetcore apps run in same linux machine under same user? will they store in same folder and cause collision/other issues?

For application isolation we create folder name with hash of process identity+folder path, so it won't cause collision.