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Heroku Architecture
- Compute (Dynos)
  - Dyno Management
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  - Dyno Behavior
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  - Dyno Troubleshooting
- 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
  - Working with Node.js
  - Troubleshooting Node.js Apps
- Ruby
  - Rails Support
  - Working with Bundler
  - Working with Ruby
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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
  - Working with PHP
  - PHP Behavior in Heroku
- 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)
- Compliance

Heroku Enterprise
- Private Spaces
  - Infrastructure Networking
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- 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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  - Add-on Development Tasks
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  - Add-on Guidelines & Requirements
- Building CLI Plugins
- Developing Buildpacks
- Dev Center

Accounts & Billing

Troubleshooting & Support

Integrating with Salesforce

Improved SSO certificate management

Change effective on 05 December 2018

Enterprise Teams using SSO can now add up to three identity provider certificates to avoid certificate-related downtime. SAML assertions signed under any unexpired SSO certificate are accepted, making it possible to swap out an expired IdP certificate without downtime.

Heroku also now sends email notifications to Enterprise Team admins when an SSO certificate is approaching its expiry date. Notifications are sent thirty days, seven days, and one day before a certificate expires.

Please visit Dev Center for more information on multi-certificate support.

Ruby 2.6.0-rc1 now available on Heroku Heroku CLI login now opens the browser by default