Here is a description of the fields used for calculating scheduled and unscheduled backlog.
Information
Key: * – Mandatory.
Field
Description
assignment-batch-size
The number of assignments in a batch when calculating the backlog for forecasting. The default value is 200.
backlog-statements-remaining-threshold
This setting is deprecated and no longer used. Salesforce has changed from a governor limit on statements to a governor limit on CPU time used. See the backlog-cpu-remaining-threshold setting.
backlog-cpu-remaining-threshold
Controls handling of CPU time governor limits by backlog batches. The default value is 500.
batch-size
The number of projects to process in a single batch when calculating the backlog. This number can be adjusted downward to address governor errors if encountered in the backlog. The default value is 25.
unscheduled-backlog-time-period-types
A list of Time period Type picklist values with calculated unscheduled backlogs. The default value is Perpetual.