Ok, I almost got it. This works:
source="*0307.log*" trigger0=* OR trigger=* [ search trigger0=* | head 1 | eval earliest=relative_time(lastTime,"-15d") | eval latest=_time | fields earliest, latest | format "(" "(" "" ")" "OR" ")" ] | timechart span=1h eval(count(trigger)) as trigger01, eval(count(trigger0)) as trigger001| eval triggerMain = trigger01+ trigger001
But all three charts are displayed (trigger01,trigger001, triggerMain) and I would like to chart only triggerMain. I haven't managed so far
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