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Heroku Architecture
- Compute (Dynos)
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- Stacks (operating system images)
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Developer Tools
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Deployment
- Deploying with Git
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Continuous Delivery & Integration (Heroku Flow)
- Continuous Integration

Language Support
- Node.js
  - Node.js Behavior in Heroku
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- Ruby
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- Python
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  - Working with Django
- Java
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  - Working with Java
  - Working with Maven
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  - Troubleshooting Java Apps
- PHP
  - PHP Behavior in Heroku
  - Working with PHP
- Go
  - Go Dependency Management
- Scala
- Clojure
- .NET
  - Working with .NET

Databases & Data Management
- Heroku Postgres
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  - Postgres Special Topics
  - Migrating to Heroku Postgres
- Heroku Key-Value Store
- Apache Kafka on Heroku
- Other Data Stores

AI
- Inference Essentials
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- Tool Use
- AI Integrations
- Vector Database

Monitoring & Metrics
- Logging

App Performance

Add-ons
- All Add-ons

Collaboration

Security
- App Security
- Identities & Authentication
  - Single Sign-on (SSO)
- Private Spaces
  - Infrastructure Networking
- Compliance

Heroku Enterprise
- Enterprise Accounts
- Enterprise Teams

Patterns & Best Practices

Extending Heroku
- Platform API
- App Webhooks
- Heroku Labs
- Building Add-ons
  - Add-on Development Tasks
  - Add-on APIs
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- Building CLI Plugins
- Developing Buildpacks
- Dev Center

Accounts & Billing

Troubleshooting & Support

Integrating with Salesforce
- Heroku AppLink
  - Working with Heroku AppLink
  - Heroku AppLink Reference
  - Getting Started with Heroku AppLink
- Heroku Connect (Salesforce sync)
  - Heroku Connect Administration
  - Heroku Connect Reference
  - Heroku Connect Troubleshooting
- Other Salesforce Integrations

January 2023 PHP updates

Change effective on 25 January 2023

The following new PHP runtime versions are now available:

PHP 8.0.27
PHP 8.1.14

The following PHP extensions have been added or updated:

ext-blackfire 1.86.3
ext-mongodb 1.15.0
ext-newrelic 10.5.0.317
ext-phalcon 5.1.4

Composer 2.5 is now available for installation of dependencies.

The blackfire CLI agent program used by ext-blackfire has been updated to 2.13.2

The Apache HTTP web server has been updated to version 2.4.55.

The Nginx web server now supports the http_auth_request and http_stub_status modules.

PHP 8.2 now available Heroku-18, Heroku-20 and Heroku-22 stack images updated