subscriber: allow to customize Registry with sharded_slab Config. #2421
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Adds
CollectionBuilder
with_slab_config::<S>()
func to this end. This e.g. allows to use tracing in environment with >= 4k threads.c.f. #1485
Motivation
Allow to use tracing with more than 4k threads and generally customize underlying
sharded_slab
.Solution
Add one more type parameter to relevent structures and provide
with_slab_config
for easy configuration.