monitoring: ignore OPTIONS requests that dont have a route handler

nixos tests: check metrics endpoints on TS services

Monitoring: tag HTTP response rate histogram by route rather than request url

*/Server.ts: Handle metrics requests

*/Server.ts: Add monitoring init hook

CodeOwners: claim /nix dir

Move why-is-node-running to dependencies

Process lifecycle scripts

Concurrent identify stress script

IPC: shutdown hooks ...

#Conflicts:
#	src/util/util/ipc/listener/UnixSocketListener.ts

Gateway: send reconnect on shutdown

Fix some copyright headers

Break up bulk inserts for read states to avoid postgres parameter exhaustion

Trace fillInMissingIDs

Bulk insert missing ReadStates

No longer handle mention_count == null since its no longer nullable

Use forEach rather than .map.forEach

Add full trace

Use sets for mention roles/users

Simplify some queries for handling mentions

User mentions: use `user_id IN (...)` rather than `user_id = ... OR user_id = ...`

Move message mention handling to separate function

Better error handling in rabbitmqsinglelistener/writer

Add startup test for legacy rabbitmq setup

Add NixOS test for starting with rabbitmq-single ipc

Nix: expose EVENT_TRANSMISSION as an option

Demote default rabbitmq behavior, implement init for all BaseEventWriter/Listener abstracted implementations

Move publishEvent to RabbitMQ.ts

Move rabbitListen to RabbitMQ.ts

Clean up unused imports in IPC code