As you may have guessed, this module gathers facts about the VMware ESXi hosts within your vSphere or vCenter cluster:

- name: Find out facts on the esxi hosts
  vmware_host_facts:
    hostname: "{{ vsphere_host }}"
    username: "{{ vsphere_username }}"
    password: "{{ vsphere_password }}"
    validate_certs: "no"
  register: host_facts
  delegate_to: localhost