The endpoint names are staying the same, but the trust chain is not. Teams that pin Sentry certificates or still ship very old Android/Java runtimes need to remove or update those assumptions before Sentry publishes its exact February cutover date.
The replacement is not a drop-in path rename: Cloudflare separates domain search, availability checks and registration operations into newer endpoints, so old registrar automation can break after the cutoff.
Theme developers using Shopify CLI 3.83.x and older against password-protected storefronts are now past the documented cutoff. Shopify requires 3.84.0 or later for these flows; the live changelog's September 23 date supersedes the earlier October 1 deadline in this dossier.
Audience-management systems can now fail with `SEGMENT_LIMIT_EXCEEDED`, while old geography identifiers begin returning invalid-field errors after August 31. LinkedIn also opened the Matched Audiences API to applications from qualified developers, increasing the importance of handling these limits correctly.
Sentry has completed a breaking alerting migration. Legacy alert APIs are gone; metric detection now lives in Monitors while notification routing lives in Alerts, and old direct integrations must use the replacement endpoints.
The deadline is no longer theoretical: browsers, Git HTTPS backends and API clients that still depend on SHA-1-era TLS algorithms can now lose connectivity to GitHub.com.
The change makes Reddit's more automated campaign type usable by agencies, ad-tech platforms and internal campaign systems instead of only through first-party buying surfaces. It expands automation reach, but third-party builders inherit Max's creative and optimization assumptions rather than gaining a new manual campaign type.
The consequential change in Formbricks 6 isn't its new charts: self-hosted operators need a separate authorization service, a maintenance window and verified migration before enabling v6 traffic. Existing follow-up automations also have a December deadline.
Fitbit API integrations have less than a month to migrate. The replacement changes authentication and API surface, while Google is still restricting onboarding for new Health API projects.
The migration is now much safer for background-only and bulk-installed apps: a timed-out direct conversion no longer automatically strands the store. The retry window is bounded and can end earlier after the issued pair is refreshed or another token acquisition supersedes it.
Buttondown’s 'Great Pruning' is a small-SaaS operations story about deleting architecture rather than adding it. The company removed duplicated or over-retained request and email-event data after changing how those workloads were processed.
The non-Plus checkout migration is now an active compatibility boundary rather than an approaching deadline. Orders can continue while old post-purchase scripts, pixels or widgets stop working, making end-to-end conversion and app-behavior checks important after the cutover.
Playground’s legacy-runtime work turns the browser sandbox into a version-spanning compatibility lab. Maintainers can inspect old WordPress behavior without keeping obsolete PHP stacks alive, although the browser runtime is not a faithful recreation of every historical host.
CircleCI has consolidated three config-breaking changes onto a September 21 cutoff. Teams using legacy v2.0 syntax, out-of-scope parameters or unsupported regex constructs need to migrate before pipelines begin failing at compilation time.
App Engine’s TLS migration is now an active rollout. Applications that still depend on TLS 1.1 or earlier can opt out only through August, while September enforcement may block old clients differently on appspot.com and custom domains.
Manifest V2 was already disabled for modern Chrome users. The August 31 change closes the remaining Web Store path, turning any still-pinned legacy install into an effectively frozen artifact with no Store update or reinstall route.
This is separate from LinkedIn’s Ads Legacy Geo cutoff already tracked by BTN. Profile and compliance integrations can fail more quietly: the request may still succeed while a field the application expects simply disappears or becomes null.
The August 28 transition is now active, and Railway’s current documentation removes an earlier ambiguity about new services in existing projects. Config as Code is legacy-only from here; production users should migrate and validate `.railway/railway.ts` before the December hard cutoff.
Google’s September Search changes now form a broader migration story: legacy campaign-level Broad Match and standalone Automatically Created Assets settings will be converted into AI Max, while language targeting stops affecting Search delivery and related API mutations begin failing.
GitHub OAuth apps can now use eight-hour access tokens with rotating refresh tokens, register up to 10 callback URLs, and explicitly control wildcard callback matching. New apps default to expiring tokens, while existing single-callback apps should review a legacy wildcard setting GitHub has now made visible.