Can Heroku Postgres dynos talk with Datadog?

There are a number of ways you can get metrics out of the box into datadog for your application or service.

Assuming you are using a backend service since you described postgres, you can use one of the many datadog dependencies. One such for node applications i use is dd-trace, it has a number of different plugins for postgres (connections using the pg library) out of the box. Although these give you a lot of metrics about querys ran and help identify application level bottlenecks, you will need to do additional work to get other things like deadlocks, indexes usages, and connected users into datadog. Two main ways to go about this,

• create a custom metric and query the db from the application using dd-trace mentioned above
• use a custom build pack to launch a separate datadog agent on heroku, this runs another thing along side the applicaton in the heroku instance whose soul purpose is to port metrics.