* Optimize RPC pubsub for multiple clients with the same subscription (#18943)
* reimplement rpc pubsub with a broadcast queue
* update tests for new pubsub implementation
* fix: fix review suggestions
* chore(rpc): add additional pubsub metrics
* integrate max subscriptions check into SubscriptionTracker to reduce locking
* separate subscription control from tracker
* limit memory usage of items in pubsub broadcast queue, improve error handling
* add more pubsub metrics
* add final count metrics to pubsub
* add metric for total number of subscriptions
* fix small review suggestions
* remove by_params from SubscriptionTracker and add node_progress_watchers map instead
* add subscription tracker tests
* add metrics for number of pubsub notifications as a counter
* ignore clippy lint in TokenCounter
* fix underflow in token counter
* reduce queue capacity in pubsub tests
* fix(rpc): fix test timeouts
* fix race in account subscription test
* Add RpcSubscriptions::new_for_tests
Co-authored-by: Pavel Strakhov <p.strakhov@iconic.vc>
Co-authored-by: Nikita Podoliako <n.podoliako@zubr.io>
Co-authored-by: Tyera Eulberg <tyera@solana.com>
(cherry picked from commit 65227f44dc)
# Conflicts:
# Cargo.lock
# core/Cargo.toml
# core/src/replay_stage.rs
# core/src/validator.rs
# replica-node/src/replica_node.rs
# rpc/Cargo.toml
* Fix conflicts (and standardize naming to make future subscription backports easier
Co-authored-by: Pavel Strakhov <ri@idzaaus.org>
Co-authored-by: Tyera Eulberg <tyera@solana.com>
03da3eaa81