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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
  - Node.js Behavior in Heroku
  - Troubleshooting Node.js Apps
  - Working with Node.js
- Ruby
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  - Working with Bundler
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  - Troubleshooting Ruby Apps
- Python
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  - 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

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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
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- 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

Integrating with Salesforce

Apache Kafka on Heroku default version is now 2.6.1

Change effective on 05 February 2021

Effective today, new Apache Kafka on Heroku addons will default to installing version 2.6.1.

If you would like to upgrade to the latest version, please refer to the Heroku Dev Center.

Private Space Apps now support TLSv1.3 February 2021 PHP updates