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Why my transaction command takes wrong event

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I am trying to determine the outage duration of a network device . I use the transaction command for this. My device goes down and comes back live say for every other hour. But my transaction command is only considering the first downtime as START and last uptime as END, due to this I am not able to determine the actual outage hours . Is there a way to make my transaction command understand how to calculate by checking every downtime and uptime events.

Example: My device goes down at 1am and comes live at 2am. Again goes down at 3am and comes live at 4am.
My transaction command calculates the downtime as 1am and uptime as 4am.

So the actual total outage hours is 2hrs (1am-2am and 3am-4am) but my transaction command calculates it as 3hrs (1am-4am).

my command is | transaction host startswith=(devicestatus="Down") endswith=(devicestatus="Up") maxspan=7d

Thanks in advance..

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Try mvexpand that is well explained in the below link:

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i uploaded these sample events -

testlog devicestatus="Down" time=1am 
testlog devicestatus="Up" time=2am
testlog devicestatus="Down" time=3am 
testlog devicestatus="Up" time=4am
testlog devicestatus="Down" time=7am 
testlog devicestatus="Up" time=8am

and transaction seems working fine..
how you calculate the outage hours.. please write the full command and maybe, post some sample events..
alt text

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