Set whether each category currently registered with metricRegistry() is enabled to the specified value, and ensure that categories registered after this call are initialized as either enabled or disabled, accordingly. If a category is disabled it will not be published (see the publish methods), and higher level components may not record values for metrics belonging to the category (for an example, see the balm_metric documentation). This operation is logically equivalent to iterating over the list of categories currently registered with metricRegistry() and calling setCategoryEnabled on each category individually, and also setting a default isEnabled() value (for newly‐created categories). Hence, subsequent calls to setCategoryEnabled will override this value for a particular category. Note that this operation is thread‐safe, but not atomic: Other threads may simultaneously access the current enabled status for a category while this operation completes. Also note that this operation has linear runtime performance with respect to the total number of category holders registered with metricRegistry() (see balm_metricregistry and balm_category for information on category holders).