# Monitoring a Live Experiment¶

There are a number of ways that you can monitor a live experiment:

## Command line tools¶

dallinger summary --app {#id}, where {#id} is the id (w...) of the application.

This will print a summary showing the number of participants with each status code, as well as the overall yield:

status  | count
----------------
1   | 26
101 | 80
103 | 43
104 | 2

Yield: 64.00%


## Papertrail¶

You can use Papertrail to view and search the live logs of your experiment. You can access the logs either through the Heroku dashboard’s Resources panel (https://dashboard.heroku.com/apps/{#id}/resources), where {#id} is the id of your experiment, or directly through Papertrail.com (https://papertrailapp.com/systems/{#id}/events).

You can set up Papertrail to send error notifications to Slack or another communications platform.

1. Take a deep breath.
2. Open the Papertrail logs.
3. Search for the term error.
4. To the right of the search bar, you will see a button titled “+ Save Search”. Click it. Name the search “Errors”. Then click “Save & Setup an Alert”, which is to the right of “Save Search”.
5. You will be directed to a page with a list of services that you can use to set up an alert.
6. Click, e.g., Slack.
7. Choose the desired frequency of alert. We recommend the minimum, 1 minute.
8. Under the heading “Slack details”, open (in a new tab or window) the link new Papertrail integration.
9. This will bring you to a Slack page where you will choose a channel to post to. You may need to log in.
10. Select the desired channel.
13. Scroll down to Step 3 to get the Webhook URL. It should look something like https://hooks.slack.com/services/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.