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Databases & Data Management
- Heroku Postgres
  - Postgres Basics
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  - Postgres Special Topics
- Heroku Redis
- Apache Kafka on Heroku
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Monitoring & Metrics
- Logging

App Performance

Add-ons
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Security
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Heroku Enterprise
- Private Spaces
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Patterns & Best Practices

Extending Heroku
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Troubleshooting & Support

Default Ruby for New Apps is Now 2.4.4

Change effective on 31 May 2018

The default Ruby version for new Ruby applications is 2.4.4. You’ll only get the default if the application does not specify a ruby version.

Ruby 2.6.0-preview2 now available on Heroku Git server updated to mitigate security vulnerability