Fix compatibility with pre-3.18 custom check backends #414
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The
subset
parameter added toBaseHealthCheckBackend
'srun_check
andcheck_status
methods in 4da1fd9 broke compatibility with existing custom check backends, since they don't accept this parameter.Moreover, this parameter appears to be entirely useless, since
check_status
is only called byrun_check
, andrun_check
is only called byCheckMixin.run_check
, which never passed a value forsubset
.Get rid of it and restore compatibility.
Fixes #413.