generated: '2026-09-04'
method: searched
source: >-
  https://docs.webscale.com/docs/reference/images/ (dated per-release image catalog notes) and
  https://docs.webscale.com/docs/latest-updates/ (dated documentation revision feed)
name: Webscale change log
surfaces:
- name: Image Catalog release notes
  url: https://docs.webscale.com/docs/reference/images/
  what: >-
    Dated release notes for the platform's container/VM image builds — the closest thing Webscale
    publishes to a product changelog. Each entry carries a "Released YYYY-MM-DD" line, a Changes
    section written in prose, and a full Artifacts matrix listing every image, OS, package version,
    architecture and public.ecr.aws URI for that build.
  scheme: calendar build number, YEAR.WEEK (e.g. 2026.40)
  cadence: roughly weekly
  machine_readable: false
  rss: none advertised
- name: Documentation Latest Updates
  url: https://docs.webscale.com/docs/latest-updates/
  what: The 30 most recently revised documentation pages, each dated. A docs-revision feed, not a product changelog.
  machine_readable: false
  rss: none advertised

api_changelog:
  published: false
  note: >-
    NO changelog exists for the Webscale v2 API itself. Neither surface above records API additions,
    removals or breaking changes, and the OpenAPI document carries only a regenerated calendar build
    stamp (info.version 2026.273) with no diff or history. A consumer of https://api.webscale.com/v2
    has no published record of what changed between builds.

current_version:
  api: v2
  openapi_build_stamp: '2026.273'
  latest_image_release: '2026.40'

entries:
- version: '2026.40'
  date: '2026-08-21'
  breaking: false
  additions:
  - >-
    V4 web server image now supports passing environment variables to containers through cluster
    metadata using a CONTAINER_ENVIRONMENT metadata entry.
  - >-
    New `web-server-php` stack in the `web-server-v4` image family that "will run php code in
    containers using a Symfony type front controller dispatch."
  changes:
  - >-
    Essentials relay proxy updated to "bypass the Vinyl cache entirely if either of `Range` or
    `Bypass-Vinyl` headers are included in a request."
  component_upgrades: [PHP-FPM 8.1-8.5, RabbitMQ 4.3.5, Varnish 6.0.18]
  url: https://docs.webscale.com/docs/reference/images/2026.40/
- version: '2026.39'
  date: '2026-08-18'
  breaking: false
  additions:
  - >-
    V4 web server image family: /share/www mount dependencies moved from a systemd stacker service
    declaration to a stack resource definition using a new `required_services` declaration.
  changes:
  - >-
    Container images now always build with the latest New Relic PHP agent (previously pinned, last to
    12.4.0.29; now tracking latest, currently 12.9.0.38).
  fixes:
  - >-
    Essentials: fixed file descriptor exhaustion in the php-fpm relay after enabling Vinyl
    ("dial unix /run/php-fpm.sock: connect: resource temporarily unavailable"), caused by Vinyl proxy
    tuning that closed connections immediately and exhausted ports in TIME_WAIT.
  url: https://docs.webscale.com/docs/reference/images/2026.39/
- version: '2026.38'
  date: '2026-08-11'
  breaking: false
  additions:
  - >-
    V3 web-server can mount a V4 core share via a new share-www.mount unit enabled with
    command.EnableService.
  changes:
  - >-
    ContainerRun may now omit username and password for AWS ECR; an image pull to an authorized
    registry is handled automatically by the ECR credential helper, removing the need for a preceding
    PrepareEcrLoginPassword.
  url: https://docs.webscale.com/docs/reference/images/2026.38/
- version: '2026.37'
  date: '2026-08-11'
  breaking: false
  changes:
  - This release contains only internal changes.
  url: https://docs.webscale.com/docs/reference/images/2026.37/
- version: '2026.36'
  date: '2026-08-10'
  breaking: false
  additions:
  - >-
    V3: supervisor shims from the nfs-server image added to web-server as an optional service, plus a
    new command.EnableService invoker command taking a name parameter.
  - 'V3: shell command now provided on web servers, with WEBSCALE_SHARE and WEBSCALE_SHARED_DIRS metadata variables for mapping network shared files into the shell.'
  - 'V3: invoker configuration from metadata; a Datadog collector and new tools.'
  url: https://docs.webscale.com/docs/reference/images/2026.36/

window: >-
  Recent window only — the image catalog index lists releases back to 2025.33. Not exhaustive.