Papertrail can create and update a Librato graph displaying the number of log messages matching a search alert.
Follow the steps in Alerts.
From Librato Account Settings, obtain this identifier:
You will also need:
Then for the search alert you are creating, choose:
Once the metric has appeared in Librato, select it, and then set the attributes as shown in the image below.
You may wish to modify:
Messages- Y-axis label
msgs- Tooltip label