Add grafana dashboard

Merge branch 'dev/monitoring'

IPC: shutdown hooks

IPC metrics

monitoring: add helper to register a metric without duplicating

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

CodeOwners: claim /nix dir

Move why-is-node-running to dependencies

Process lifecycle scripts ...

#Conflicts:
#	src/api/Server.ts
#	src/bundle/Server.ts
#	src/cdn/Server.ts
#	src/gateway/Server.ts
#	src/gateway/events/Connection.ts
#	src/util/util/ipc/listener/RabbitMqSingleListener.ts
#	src/util/util/ipc/listener/UnixSocketListener.ts
#	src/util/util/ipc/writer/UnixSocketWriter.ts
#	src/webrtc/Server.ts

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