Why spam warning Connection pool is full, discarding connection: localhost in aiogram?

Question

Python

I ran into a problem, there is a tg bot on aiogram, constantly, even in idle mode, spamming a warning

. I didn’t find clear information about what it is for, or how to track it.
And I've only encountered this problem on Linux.
The bot itself launches a browser instance (selenium), which performs N-th work in a thread.

There is an assumption that due to selenium, the pool is somehow blocked:

async def update_cards():
    while True:
        if browsers:
            for key in list(browsers.keys()):
                cards = browsers[key].get_cards()
                await commands.add_card_for_cards(cards=cards[0], account_id=cards[1], user_id=cards[2])
        await asyncio.sleep(30)


async def get_daily_cards():
    while True:
        if browsers:
            for key in list(browsers.keys()):
                cards = browsers[key].get_daily_cards()
                await commands.add_daily_card_for_cards(cards=cards[0], account_id=cards[1])
        await asyncio.sleep(360)

async def on_startup(_):
  await set_commands(bot)
  asyncio.create_task(update_cards())
  asyncio.create_task(get_daily_cards())


if __name__ == '__main__':
  executor.start_polling(dp, skip_updates=True, on_startup=on_startup, allowed_updates=get_handled_updates_list(dp))

If anyone had this problem, how did you solve it?