Logging is now a standard platform feature.
Logging gives you detailed visibility into your application. Both your app logs and system logs from Heroku appear in the same place. You can get a realtime tail and filter down to individual processes.
Access to app and system logs. Throughput up to 500 lines per minute, with 500 lines of history.
Adds filtering and realtime tail. Throughput up to 10k lines per minute, with 500 lines of history.
Unlimited log throughput, 1500 lines of history, and the ability to provide your own syslog endpoint for offsite archival of your logs.