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Heroku Architecture
- Compute (Dynos)
  - Dyno Management
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- Stacks (operating system images)
- Networking & DNS
- Platform Policies
- Platform Principles

Command Line

Deployment
- Deploying with Git
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Continuous Delivery & Integration
- Continuous Integration

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

Databases & Data Management
- Heroku Postgres
  - Postgres Basics
  - Postgres Getting Started
  - Postgres Performance
  - Postgres Data Transfer & Preservation
  - Postgres Availability
  - Postgres Special Topics
- Heroku Key-Value Store
- Apache Kafka on Heroku
- Other Data Stores

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
- Heroku Connect (Salesforce sync)
  - Heroku Connect Administration
  - Heroku Connect Reference
  - Heroku Connect Troubleshooting

Patterns & Best Practices

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

Accounts & Billing

Troubleshooting & Support

Integrating with Salesforce

September 2021 PHP Updates

Change effective on 28 September 2021

The following new PHP runtime versions are now available:

PHP 7.3.31
PHP 7.4.24
PHP 8.0.11

The following PHP extensions have been added or updated:

ext-blackfire version 1.67.0
ext-ev version 1.1.5
ext-event version 3.0.6
ext-pq version 2.2.0

The version of Composer 2 used during builds has been updated to 2.1.8.

The Apache HTTPD web server has been updated to version 2.4.49.

The blackfire CLI agent program used by ext-blackfire has been updated to 2.5.0.

The librdkafka library used by the ext-rdkafka extension has been updated to version 1.8.0.

Python 3.10.0 is now available Heroku-18 and Heroku-20 Stack Images Updated