* chore: harmonize OSS and Enterprise subscriber initialization
* refactor: chanwriter close blocks until chanwriter is flushed
* refactor: remove redundant state
* test: add test for blocked subscriber during subscription update
* fix: blocked subscriber does not fail subscription update
* fix: only iterate matching subscriptions
* fix: use serialized points in subscriber queues
* feat: add total-buffer-bytes config parameter to subscriptions
* fix: put subscription serialization on the write path
* fix: subscription service only needs regular mutex, not RWMutex
* fix: review comments
* chore: update changelog
(cherry picked from commit 85abb3af36)
The subscriber write goroutine would drop points if the write load
was higher than it could process. This could happen with a just
a few writers to the server.
Instead, process the channel with multiple writers to avoid dropping
writes so easily. This also adds some config options to control how
large the channel buffer is as well as how many goroutines are started.
Fixes#7330
Sam Arnold
Jeff Wendling
Mark Rushakoff
Jason Wilder
Mike Glazer
Nathaniel Cook
orthogonous