Beta-stage testing for Yunohost 11.0/Bullseye and Buster->Bullseye migration

On a lime2with a zram of 50MB, i got this error in loop:

--- Logging error ---
Traceback (most recent call last):
  File "/usr/lib/python3.7/logging/__init__.py", line 1038, in emit
    self.flush()
  File "/usr/lib/python3.7/logging/__init__.py", line 1018, in flush
    self.stream.flush()
OSError: [Errno 28] No space left on device
Call stack:
  File "/usr/bin/yunohost", line 72, in <module>
    parser=parser
  File "/usr/lib/moulinette/yunohost/__init__.py", line 25, in cli
    ret = moulinette.cli(args, output_as=output_as, timeout=timeout, top_parser=parser)
  File "/usr/lib/python3/dist-packages/moulinette/__init__.py", line 131, in cli
    args, output_as=output_as, timeout=timeout
  File "/usr/lib/python3/dist-packages/moulinette/interfaces/cli.py", line 496, in run
    ret = self.actionsmap.process(args, timeout=timeout)
  File "/usr/lib/python3/dist-packages/moulinette/actionsmap.py", line 599, in process
    return func(**arguments)
  File "/usr/lib/moulinette/yunohost/tools.py", line 942, in tools_migrations_run
    migration.run()
  File "/usr/lib/moulinette/yunohost/data_migrations/0021_migrate_to_bullseye.py", line 151, in run
    tools_upgrade(target="system", allow_yunohost_upgrade=False)
  File "/usr/lib/moulinette/yunohost/log.py", line 419, in func_wrapper
    result = func(*args, **kwargs)
  File "/usr/lib/moulinette/yunohost/tools.py", line 583, in tools_upgrade
    returncode = call_async_output(dist_upgrade, callbacks, shell=True)
  File "/usr/lib/python3/dist-packages/moulinette/utils/process.py", line 90, in call_async_output
    callback(message)
  File "/usr/lib/moulinette/yunohost/tools.py", line 580, in <lambda>
    if _apt_log_line_is_relevant(l)
  File "/usr/lib/python3.7/logging/__init__.py", line 1395, in warning
    self._log(WARNING, msg, args, **kwargs)
  File "/usr/lib/python3/dist-packages/moulinette/utils/log.py", line 132, in _log
    return super()._log(*args, **kwargs)

I removed some logs and the situation was fixed instantly.