fact didn't match any rule and has been immediately discarded

[wuhaohust]

I am new to ansible-rulebook, I am trying to use it to collect some info when zabbix alert triggered . I installed below version on SUSE15

ansible-rulebook [1.1.7]
Executable location = /usr/local/bin/ansible-rulebook
Drools_jpy version = 0.3.10
Java home = /usr/lib64/jvm/java-17-openjdk-17
Java version = 17.0.16
Ansible core version = 2.19.1
Python version = 3.11.13
Python executable = /usr/bin/python3.11
Platform = Linux-5.14.21-150500.55.116-default-x86_64-with-glibc2.31

I create a simple rule file with below content:

• name: Debug Incoming Events
  hosts: all
  sources:

  • ansible.eda.webhook:
    host: 0.0.0.0
    port: 5000

  rules:

  • name: get the top5 CPU processes
    condition: event.payload.event_name is defined
    actions:

    • set_fact:
      fact:
      target_host: "test-server"
      incident_ref: "4560"

    • debug:
      msg: "{{ target_host }}"

    • run_playbook:
      name: top5_cpu_linux.yml
      extra_vars:
      host: "{{ event.target_host }}"

but it always prompt target_host is not defined , and from the log I can see

2025-09-26 21:19:12,282 - ansible_rulebook.rule_generator - DEBUG - callback calling get the top5 CPU processes
2025-09-26 21:19:12,282 - ansible_rulebook.rule_set_runner - DEBUG - None
2025-09-26 21:19:12,283 - ansible_rulebook.rule_set_runner - DEBUG - Creating action task action::set_fact::Debug Incoming Events::get the top5 CPU processes
2025-09-26 21:19:12,283 - ansible_rulebook.rule_set_runner - DEBUG - call_action set_fact
2025-09-26 21:19:12,283 - ansible_rulebook.action.set_fact - DEBUG - set_fact: ruleset=Debug Incoming Events, fact={'target_host': 'dp-ansib-p-v', 'incident_ref': '4560'}
2025-09-26 21:19:12 285 [main] DEBUG org.drools.ansible.rulebook.integration.api.rulesengine.AbstractRulesEvaluator - Fact {"target_host":"test-server1","incident_ref":"4560","meta":{"source":{"name":"set_fact","type":"internal"},"received_at":"2025-09-26T13:19:12.283370Z","uuid":"fde8e901-de3b-411d-af38-4c8bc2ebb7ce"}} didn't match any rule and has been immediately discarded
2025-09-26 21:19:12,285 - ansible_rulebook.rule_set_runner - DEBUG - Task action::set_fact::Debug Incoming Events::get the top5 CPU processes finished, active actions 1
2025-09-26 21:19:12,286 - ansible_rulebook.rule_set_runner - DEBUG - Creating action task action::debug::Debug Incoming Events::get the top5 CPU processes
2025-09-26 21:19:12,286 - ansible_rulebook.rule_set_runner - DEBUG - call_action debug
2025-09-26 21:19:12,288 - ansible_rulebook.rule_set_runner - DEBUG - Task action::debug::Debug Incoming Events::get the top5 CPU processes finished, active actions 1
2025-09-26 21:19:12,288 - ansible_rulebook.rule_set_runner - DEBUG - Task Task-11 finished, active actions 0
2025-09-26 21:19:12,288 - ansible_rulebook.rule_set_runner - ERROR - 'facts' is undefined