Default value for max fiber slice
Max fiber slice specifies the max fiber execution time without yield before a warning is logged or an error is raised.
It is set with the fiber.set_max_slice() function.
The new compat option – fiber_slice_default – controls the default value of the max fiber slice.
The old default value for the max fiber slice is infinity (no warnings or errors). The new default value is {warn = 0.5, err = 1.0}.
If you see a warning like this in the log:
fiber has not yielded for more than 0.500 seconds,
or the following error is raised unexpectedly by a box function
error: fiber slice is exceeded,
then your application has a fiber that may exceed its slice and fail.
To fix this you need to reset the fiber slice with the fiber.set_max_slice() function.