docs(plugins): deprecate heroku (#15029)

## DESCRIBE YOUR PR
We're sending emails tomorrow to customers about this deprecation. The
docs should reflect the email content.

## IS YOUR CHANGE URGENT?  

Help us prioritize incoming PRs by letting us know when the change needs
to go live.
- [x] Urgent deadline (GA date, etc.): Sep 24, 2025
- [ ] Other deadline: <!-- ENTER DATE HERE -->
- [ ] None: Not urgent, can wait up to 1 week+

## SLA

- Teamwork makes the dream work, so please add a reviewer to your PRs.
- Please give the docs team up to 1 week to review your PR unless you've
added an urgent due date to it.
Thanks in advance for your help!

## PRE-MERGE CHECKLIST

*Make sure you've checked the following before merging your changes:*

- [ ] Checked Vercel preview for correctness, including links
- [ ] PR was reviewed and approved by any necessary SMEs (subject matter
experts)
- [ ] PR was reviewed and approved by a member of the [Sentry docs
team](https://github.com/orgs/getsentry/teams/docs)

Author: sentaur-athena

develop-docs/integrations/heroku.mdx

@@ -1,7 +1,10 @@
 ---
 title: Heroku Plugin
-sidebar_title: Heroku
+sidebar_title: Heroku (Legacy)
 ---
+## Deprecation Warning
+Heroku plugin is deprecated and will be removed on October 25, 2025. This plugin automatically tracked releases and deployments from your Heroku apps in Sentry, linking them to error tracking and performance monitoring.
+You can still use Sentry with Heroku by setting up [Releases](https://docs.sentry.io/product/releases/). Releases let you track versions, commits, crash-free sessions, and more.
 
 ## Create a Heroku application
 

docs/organization/integrations/deployment/heroku/index.mdx

@@ -1,10 +1,11 @@
 ---
-title: Heroku
+title: Heroku (Legacy)
 sidebar_order: 1
 description: "Learn more about Sentry's Heroku integration, which allows you to create releases in Sentry when your Heroku app is deployed."
 ---
-
-This integration needs to be set up in each project for which you wish to use it. It is maintained and supported by the [Sentry community](https://open.sentry.io/).
+## Deprecation Warning
+Heroku integration on Sentry is deprecated and will be removed on October 28, 2025. This plugin automatically tracked releases and deployments from your Heroku apps in Sentry, linking them to error tracking and performance monitoring.
+You can still install the Sentry Add-on on Heroku and use Sentry with Heroku by setting up [Releases](/product/releases/) yourself. Heroku integration on Sentry will no longer be available.
 
 ### Register the Add-on
 

docs/organization/integrations/deployment/index.mdx

@@ -8,6 +8,6 @@ description: "Learn more about Sentry's deployment integrations."
 - [Expo](/organization/integrations/deployment/expo/)
 - [GitHub Actions](/product/releases/setup/release-automation/github-actions/)
 - [GitHub Deployment Gates](/product/releases/setup/release-automation/github-deployment-gates/)
-- [Heroku](/organization/integrations/deployment/heroku/)
+- [Heroku (Legacy)](/organization/integrations/deployment/heroku/)
 - [Netlify](/product/releases/setup/release-automation/netlify/)
 - [Vercel](/organization/integrations/deployment/vercel/)

docs/organization/integrations/index.mdx

@@ -80,7 +80,7 @@ For more details, see the [full Integration Platform documentation](/organizatio
 | -------------------------------------------------------------------------------------- | ------------------ | ----------------- | -------------------- | ----------------------------- |
 | [Bitbucket Pipelines](/product/releases/setup/release-automation/bitbucket-pipelines/) | X                  | X                 | X                    | X                             |
 | [GitHub Actions](/product/releases/setup/release-automation/github-actions/)           | X                  | X                 | X                    | X                             |
-| [Heroku](/organization/integrations/deployment/heroku/)                                     | X                  | X                 | X                    |                               |
+| [Heroku(Legacy)](/organization/integrations/deployment/heroku/)                                     | X                  | X                 | X                    |                               |
 | [Netlify](/product/releases/setup/release-automation/netlify/)                         | X                  | X                 | X                    | X                             |
 | [Vercel](/organization/integrations/deployment/vercel/)                                     | X                  | X                 | X                    | X                             |