But DATETIME_CONFIG=current will override the settings for timestamp configurations and will set all timestamps to the current time. I don't know your data so not sure if you need a custom DATETIME_CONFIG file.
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If you just want to add the image, not do anything fancy with it, you can use inline HTML in Simple XML. That way you do not need any JavaScript or StyleSheet files.
<dashboard>
<label>Picture in dashboard</label>
<row>
<html>
<img src="level3_description.png" />
</html>
</row>
</dashboard>
This would add your picture as a panel.
For more information check out the Build Dashboards with Simple XML section in the manual.
Cheers,
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You could also look at autoregress command. Something like this might work
... | reverse | autoregress powerconsumption as prev_value | eval change=prev_value/powerconsumption | where change<0.05 OR change>0.05
http://docs.splunk.com/Documentation/Splunk/6.1.4/SearchReference/Autoregress
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