Start maybe with the generic query -
| metadata type=hosts index=*
| eval host=lower(host)
| eval _time=recentTime
| sort host, _time
| stats latest(_time) as recentTime by host
| eval LAST=strftime(recentTime,"%a %m/%d/%Y-%T %Z(%z)"), DAYS_AGO=round((recentTime-now())/86400,0)
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