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Heroku Architecture
- Compute (Dynos)
  - Dyno Management
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- Stacks (operating system images)
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Command Line

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

Language Support
- Node.js
  - Working with Node.js
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  - Node.js Behavior in Heroku
- Ruby
  - Rails Support
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  - Working with Django
- Java
  - Java Behavior in Heroku
  - Working with Java
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  - 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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- Heroku Connect (Salesforce sync)
  - Heroku Connect Administration
  - Heroku Connect Reference
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Patterns & Best Practices

Extending Heroku
- Platform API
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  - Add-on Development Tasks
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- Building CLI Plugins
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Accounts & Billing

Troubleshooting & Support

Integrating with Salesforce

PHP 7.0.1 and OPcache configuration updates

Change effective on 18 December 2015

PHP 7.0.1 is now available as a runtime for PHP applications on Heroku.

The following settings for Zend OPcache have been changed for all PHP runtimes:

opcache.memory_consumption now defaults to 128
opcache.interned_strings_buffer now defaults to 8
opcache.max_accelerated_files now defaults to 4000

Event density gradients now in Metrics beta channel Change in Dashboard Metrics policy for legacy dyno pricing plans