Overview

Zester's self-update system is split across the CLI, master rollout controller, and node-local watchdog.

Components

zester update CLI: publish binaries, start/abort rollouts, inspect rollout/node status, trigger rollback.
Master rollout controller (pkg/update/rollout.go): coordinates batch updates across target nodes.
Watchdog (cmd/zester-watchdog + pkg/update): supervises the child process, applies binary swaps, reports status.
NATS storage (pkg/bus/kv.go): manifests, rollout state, node status heartbeats, and binary object store.