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Heroku Architecture
- Dynos (app containers)
- Stacks (operating system images)
- Networking & DNS
- Platform Policies
- Platform Principles

Command Line

Deployment
- Deploying with Git
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- Deployment Integrations

Continuous Delivery
- Continuous Integration

Language Support
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  - Working with Bundler
  - Rails Support
- Python
  - Working with Django
  - Background Jobs in Python
- Java
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  - Java Database Operations
  - Working with the Play Framework
  - Java Advanced Topics
  - Working with Spring Boot
- PHP
- Go
  - Go Dependency Management
- Scala
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Databases & Data Management
- Heroku Postgres
  - Postgres Basics
  - Postgres Performance
  - Postgres Data Transfer & Preservation
  - Postgres Availability
  - Postgres Special Topics
- Heroku Redis
- Apache Kafka on Heroku
- Other Data Stores

Monitoring & Metrics
- Logging

App Performance

Add-ons
- All Add-ons

Collaboration

Security
- App Security
- Identities & Authentication
- Compliance

Heroku Enterprise
- Private Spaces
  - Infrastructure Networking
- Enterprise Accounts
- Enterprise Teams
- Heroku Connect (Salesforce sync)
  - Heroku Connect Administration
  - Heroku Connect Reference
  - Heroku Connect Troubleshooting
- Single Sign-on (SSO)

Patterns & Best Practices

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

Accounts & Billing

Troubleshooting & Support

Platform API now supports running dynos with custom environment

Change effective on 13 September 2013

The API to run dynos now take env, a hash of custom environment variables to be added to that particular run.

Ruby 2.1.0 preview1 now supported on Heroku Platform API addon services and plans list `slug` ranges renamed to `name`