coverage report file duplicated when using logger

**understanding the problem: why coverage reports get duplicated**

the core reason for duplicated coverage reports usually boils down to these factors:

**scenarios where this problem arises**

* **multiprocessing in tests:** many test runners (e.g., `pytest` with the `pytest-xdist` plugin) automatically parallelize tests to speed up execution. this is a very common scenario.

* **web servers/workers:** if you're running tests against a web application that uses a multi-process architecture (like gunicorn or uwsgi with multiple workers), each worker process can generate its own `.coverage` file.

* **asynchronous tasks:** while less frequent, if your application uses asynchronous tasks (e.g., with `asyncio ...

#CoverageReport #LoggerIssue #numpy
coverage report
file duplication
logger issue
report generation
logging error
data redundancy
test coverage
software testing
error reporting
log management
code analysis
output file
reporting tools
debugging logs
project documentation