generated: '2026-09-17'
method: searched
source: https://docs.bugsnag.com/whats-new/
docs: https://docs.bugsnag.com/whats-new/
description: >-
  BugSnag publishes a dated "What's new" changelog on its product docs site,
  organised by month and archived by year, split into Features, Improvements
  and Bug Fixes. It covers the product and the notifier SDKs; it is not an API
  changelog and does not record contract changes to the Data Access API.
scheme: monthly, by calendar year
current_version: Data Access API v2
archives:
  - label: 2026 Release Notes
    url: https://docs.bugsnag.com/whats-new/
  - label: 2025 Release Notes
    url: https://docs.bugsnag.com/whats-new/
entries:
  - period: '2026-08'
    breaking: false
    features:
      - >-
        Remote SDK Source-Side Discard Enforcement — active dashboard discard
        rules sync directly to upgraded Android and iOS SDKs, cutting network
        bandwidth and processing overhead, with full backward compatibility and
        fail-open delivery if remote config sync is unavailable.
    fixes:
      - Normalize --project-root paths with trailing slashes during symbol file upload.
  - period: '2026-07'
    breaking: false
    features:
      - >-
        Custom session windows via the SDK API, with aggregated CPU and memory
        metrics (mean/min/max) per window. Session span groups appear under a new
        Sessions tab in Performance.
  - period: '2026-06'
    breaking: false
    features:
      - Compare two span instances from the same span group side by side.
    improvements:
      - BugSnag CLI now correctly preserves the specified project root path during uploads.
      - Vue Router v5 support in the JS performance SDK.
    fixes:
      - Improved security for Cocoa SDK binaries.
  - period: '2026-05'
    breaking: false
    features:
      - Pre-main aggregate view for iOS App Starts.
      - >-
        Self-hosted MCP server OAuth 2.0 support — connect to BugSnag via
        browser-based login instead of manual API tokens.
      - System Metrics Flutter support (CPU, memory, rendering).
  - period: '2026-04'
    breaking: false
    features:
      - '"Does not equal" operator for release in the shared Release filter.'
      - >-
        Correlated Events — see related BugSnag events sharing the same user,
        device, session or trace from the event view.
      - CPU, memory and rendering metrics from Flutter apps on Android and iOS.
      - Self-hosted MCP server OAuth authentication as an alternative to API tokens.
    improvements:
      - HTTP span attribute names aligned to the latest OpenTelemetry semantic conventions in the Flutter Performance SDK.
      - Rails performance improvement via monotonic_subscribe.
      - isStarted flag to check Bugsnag initialization status in the Flutter SDK.
      - Go SDK supports custom error names and messages in Notify.
    fixes:
      - Fixed incorrect app version reporting for Unreal apps on macOS.
  - period: '2026-03'
    breaking: false
    features:
      - Short-lived token support in the Linear plugin.
      - 'New error class: HTTP Errors.'
      - App Hang detection on Android.
      - Errors-introduced filter now matches by release stage.
      - Reporting errors with HTTP requests in bugsnag-android v6.23.0 and Cocoa.
api_changelog:
  published: false
  note: >-
    No separate API changelog. Data Access API contract changes are visible only
    as new SwaggerHub versions under smartbear-public; the portal records a
    content-updated timestamp per docs page (the Data Access guides were last
    updated 2026-08-25).