Postgres Add-on - Learning Heroku Postgres - page 84

Monitoring and logging
Logs are important to understand the behavior of your application and to identify problems.
Heroku also offers, through its client, a way to track the logs generated:
$ heroku logs -t --app your-app-name
2014-05-25T13:16:09.958885+00:00 heroku[api]: Enable Logplex
by [e-mail]
2014-05-25T13:16:09.958885+00:00 heroku[api]: Release v2
created by [e-mail]
You can apply a filter in the command logs to view only the logs generated by PostgreSQL
using the -p postgres flag:
$ heroku logs -p postgres -t --app your-app-name
To see all the options provided by the command logs, you can use the --help flag:
$ heroku logs --help
Usage: heroku logs
display recent log output
-n, --num NUM # the number of lines to display
-p, --ps PS # only display logs from the given
process
-s, --source SOURCE # only display logs from the given
source
-t, --tail # continually stream logs
Tip
Chapter 7 , Understanding Log Statements and Common Errors covers more information
about Heroku's log system.