Features

Cross-cutting capabilities — things that span multiple systems and make sense as a single chapter even when their implementation is scattered.

Feature	Spans
Service discovery	DNS, HTTP catalog, prepared queries, anti-entropy
Service mesh (Connect)	Connect CA, proxycfg, xDS, intentions, gateways
Key/value store	KV endpoint, sessions, watches, locks
ACL system	Tokens, policies, roles, auth methods, binding rules, templated policies
Intentions	Service-to-service authorization in the mesh
Config entries	Cluster-wide configuration with multiple kinds
API gateway	Mesh ingress with HTTP/TCP routing, JWT, certs
Snapshots and disaster recovery	FSM snapshots, save/restore, integrity

For lower-level subsystems and the agent/server runtime, see Systems.