log issues in auto instrumentation

[muhaook]

Bug Report

3 issues about log in auto instrumentation:

• debug is always on
  ideally, it is configurable to switch on/off of debug level in logging.
• logging is stopped after log file size reached 10 MB
  we probably need a rotation mechanism so that logging can continue after reaching a file size limit.
• log file clean up
  there will be a lot of log files after applications keep running for a long time. we probably need a clean up mechanism based on retention policies.

[pellared]

Related issues:

• Add OTEL_LOG_LEVEL support #372
• Logfile size is limited #469

[pjanotti]

Adding support to disable logging via something like #372 seems a good idea. That said there are a few issues opened related to our logging. It seems a good opportunity to define a small plan instead of taking incremental changes. The top Q that we have to decide is if we should adopt the same mechanism as the SDK. If yes, what about native .NET Framework logging?

[Kielek]

First post 0.6.0 version should contains all changed.

[lachmatt]

All of the requirements should be met:

• logLevel is configurable using OTEL_LOG_LEVEL
• rotation mechanism is in place
• max 10 log files should be retained