Cannot rename fields unless they're present in every log record

Original Issue: https://github.com/madzak/python-json-logger/issues/171

I tried the following configuration to get field names matching the OpenTelemetry semantic conventions:
json:
  (): pythonjsonlogger.jsonlogger.JsonFormatter
  rename_fields:
    otelTraceID: trace_id
    otelSpanID: span_id
    otelServiceName: service.name
     levelname: severity
     message: body
     threadName: thread.name
     exc_type: exception.type
     exc_val: exception.message
     traceback: exception.stacktrace
     pathname: code.filepath
     lineno: code.lineno
     funcName: code.function
  format: '%(levelname)s %(name)s %(threadName)s %(message)s %(pathname)s %(lineno)s %(funcName)s'
It would not work because some of these fields were not present in every log record, but the field rename function requires cannot handle missing fields. In particular, renaming the exception related fields is impossible.

Addendum: explicitly adding these fields to format removes the error, but then they have null values where a log record does not contain an exception. Would it be possible to get fields renamed without making them mandatory?

https://github.com/madzak/python-json-logger/issues/189 appears to be a duplicate

nhairs / python-json-logger

Cannot rename fields unless they're present in every log record #6