Remove the following section from https://confluence.atlassian.com/bamboo/modifying-notification-templates-289276982.html since it's not working:

Configuring notifications content via system properties

The following system properties can be configured to control some of the content that is included in notifications (e.g. the number of log lines to include in email notifications that display log information). For instructions on how to configure a system property, please refer to the Starting Bamboo page.

Before you begin:
The system properties below do not add content to notifications. You still need to ensure that your notification templates contain the relevant entities to display the content. For example, changing the bamboo.notifications.logLinesToInclude property will not add log information to your notifications. It only modifies the number of log lines displayed in notification templates that already include logs.