Try rewriting your last line as follows:
| eval(round(avg(duration),0)) as AVG_Response_Time(ms) | timechart span=5m | search "AVG_Response_Time(ms)" > 10,try rewriting your line as follows:
| eval(round(avg(duration),0)) as AVG_Response_Time(ms) | timechart span=5m | search "AVG_Response_Time(ms)" > 10
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