flaky test dashboard\tests\test_components.py::test_profile_plot

[graingert]

https://github.com/dask/distributed/runs/6606349289?check_suite_focus=true#step:11:1682

================================== FAILURES ===================================
______________________________ test_profile_plot ______________________________

c = <Client: No scheduler connected>
s = <Scheduler 'tcp://127.0.0.1:53236', workers: 0, cores: 0, tasks: 0>
a = <Worker 'tcp://127.0.0.1:53237', name: 0, status: closed, stored: 0, running: 0/1, ready: 0, comm: 0, waiting: 0>
b = <Worker 'tcp://127.0.0.1:53239', name: 1, status: closed, stored: 0, running: 0/2, ready: 0, comm: 0, waiting: 0>

    @gen_cluster(client=True, clean_kwargs={"threads": False})
    async def test_profile_plot(c, s, a, b):
        p = ProfilePlot()
        assert not p.source.data["left"]
        await c.gather(c.map(slowinc, range(10), delay=0.05))
        p.update(a.profile_recent)
>       assert len(p.source.data["left"]) >= 1
E       assert 0 >= 1
E        +  where 0 = len([])

distributed\dashboard\tests\test_components.py:30: AssertionError