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3. Changelog

This changelog provides information on changes across the Fastly platform, including to the VCL language, our public API, CLI, Terraform provider, Compute Rust SDK, Compute JavaScript SDK, Compute Go SDK and Next-Gen WAF.

• February 24, 2026
  APIAdditions

  Add Compute error metrics to Historical Stats and Real-Time Analytics APIs

• February 24, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.40.1

• February 20, 2026
  APIAdditions

  Add Image Optimizer format counting metrics

• February 17, 2026
  JavaScript SDKFixesAdditions

  JavaScript SDK 3.40.0

• February 17, 2026
  Next-Gen WAF agentChanges

  Next-Gen WAF agent 4.75.0

• February 13, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.4

• February 12, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.3

• February 9, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.1

• February 9, 2026
  JavaScript SDKFixes

  JavaScript SDK 3.39.2

• February 5, 2026
  Next-Gen WAF for Node.jsChanges

  Next-Gen WAF for Node.js 2.4.1