How did the data ['id'] in reactor in saltstack come from?

How did the data ["id"] in reactor in

salt come from?

{% if data["id"] == "mysql1" %}
highstate_run:
  local.state.apply:
    - tgt: mysql1
{% endif %}

{% if data["data"]["custom_var"] == "runit" %}
call_runit_orch:
  runner.state.orchestrate:
    - args:
      - mods: orchestrate.runit
{% endif %}

what are the variables of data ["id"] and data"data" in this? where can I find them? can I see them on saltstack"s official website?

Apr.02,2021

salt/job/20180803151349897122/ret/minion2       {
    "_stamp": "2018-08-03T07:13:50.189275",
    "cmd": "_return",
    "fun": "test.ping",
    "fun_args": [],
    "id": "minion2",
    "jid": "20180803151349897122",
    "retcode": 0,
    "return": true,
    "success": true
}

data refers to the dictionary of salt events. Salt-run'* 'state.event pretty=True looks at event contents

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