Source: https://www.zaproxy.org/docs/desktop/addons/automation-framework/test-stats/

Automation Framework - Statistics Job Test

Statistics-based tests are supported by all add-ons that have an automation job. If there is a relevant statistic used by an add-on, a test can be created for it.
An up to date list of the statistics ZAP maintains can be found at https://www.zaproxy.org/docs/internal-statistics/ .

A job can have tests for multiple statistics and multiple tests can be created for the same statistic.

Note that statistics-based tests will function correctly only if in memory statistics have been enabled .

YAML

  jobs:
  - type: example
    parameters:
      jobSpecificParam: 'value'
    tests:
      - name: 'test one'                      # Name of the test, optional
        type: stats                           # Specifies that the test is of type 'stats'
        statistic: 'stats.addon.something'    # Name of an integer / long statistic
        site:                                 # Name of the site for site specific tests, supports vars
        operator: '>='                        # One of '==', '!=', '>=', '>', '<', '<='
        value: 10                             # Value to compare statistic against
        onFail: 'info'                        # String: One of 'warn', 'error', 'info', mandatory