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Heroku Architecture
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Databases & Data Management
- Heroku Postgres
  - Postgres Basics
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  - 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
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Security
- App Security
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  - Single Sign-on (SSO)
- Compliance

Heroku Enterprise
- Private Spaces
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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