Real pebble tests failing intermittently

[benhoyt]

Example failed run here.

The failure is:

  File "/home/runner/work/operator/operator/test/test_real_pebble.py", line 132, in test_checks_and_health
    assert bad_check.failures == 2
AssertionError: assert 3 == 2
 +  where 3 = CheckInfo(name='bad', level=CheckLevel.READY, status=CheckStatus.DOWN, failures=3, threshold=2, change_id=ChangeID('12')).failures
=========================== short test summary info ============================
FAILED test/test_real_pebble.py::TestRealPebble::test_checks_and_health - AssertionError: assert 3 == 2

I assume it's because test_checks_and_health has some code in it that's too timing-sensitive. Not sure why it just started happening recently. It's happened a couple of times today, but I don't remember seeing it before that.