# `FlyDeploy.Upgrader`

Downloads and applies hot code upgrades on individual machines.

This module handles the actual upgrade process:
1. Download tarball from S3
2. Extract and copy .beam files
3. Suspend processes, load new code, upgrade processes, resume

# `hot_upgrade`

Normal hot upgrade on a running system.

Uses suspend/resume for safe process upgrades.

## Options

  * `:suspend_timeout` - Timeout in ms for suspending each process (default: 10_000)

# `replay_upgrade_startup`

Replay a hot upgrade on application startup.

This is called when a machine restarts and needs to reapply a hot upgrade
that was previously deployed. Unlike hot_upgrade/2, this:
1. Pre-loads all changed modules AFTER copying beam files
2. Doesn't need to suspend/resume processes (they don't exist yet)

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*Consult [api-reference.md](api-reference.md) for complete listing*