Python logging MemoryHandler leaks memory?

In a main.py file I have following code:

import time

from v1 import log, ServiceLogger
from logging.handlers import MemoryHandler


class Service:
    h = MemoryHandler(1000)
    id = None
    log = None

    def __init__(self, id: int):
        self.id = id
        self.log = ServiceLogger(log)
        log.addHandler(self.h)

    def do(self):
        print("Do some job per service!")


def service_exec():
    service = Service(id=4)
    service.do()


if __name__ == '__main__':
    while True:
        for i in range(10):
            service_exec()
            time.sleep(1)

And then v1.py has following content:

import logging

log = logging.getLogger('.'.join(__name__.split('.')[:-1]))


class ServiceLogger(logging.LoggerAdapter):
    def log(self, level, msg, *args, **kwargs):
        print("Custom logger hello!")

The problem is that over a time (~15-30 mins) I noticed that my computer memory increases over a period, and continue to grow forever with around 15-30 mins intervals. I used top -p <PID> to track the "VIRT RES SHR" resources, in particular that "RES". However, if I remove this log.addHandler(self.h) code snippet, then memory doesn't grow (so I left computer for couple hours and no grow has been noticed). Could somebody hint me what kind of problem could this be and how to solve it?

UPD: moving logging handler into global variable space, doesn't solve an issue, memory still grows:

h = MemoryHandler(1000)
log.addHandler(h)

class Service:
    id = None
    log = None

    def __init__(self, id: int):
        self.id = id
        self.log = ServiceLogger(log)