v1.32.0

Cache Server Lookups in Node Controllers

This release introduces an experimental server cache to reduce Hetzner Cloud API calls. During an experimental phase, breaking changes on those features may occur within minor releases.

The node and node lifecycle controllers look up Servers by ID or name, generating significant API traffic during cluster scaling. A new cache sits between the controllers and the API to serve these lookups, reducing the number of requests.

It is enabled by default since we believe the implementation is safe in practice, but is experimental and may see breaking changes within minor releases. Configure it via environment variables:

• HCLOUD_SERVER_CACHE_MODE (all | one | off, default all):

  • all — fetch all Servers once and serve lookups from the snapshot until the TTL expires.
  • one — cache each Server individually with its own expiration.
  • off — disable caching; every lookup hits the API.

• HCLOUD_SERVER_CACHE_TTL (duration, default 10s): lifetime of cached entries (e.g. 30s, 2m); values above a minute are not recommended.

Features

• instances: cache server lookups to reduce API calls (#1252)