I would like to add a second line to a filler or marker gauge which shows the highest level reached over a certain time-frame. (high water mark)
is this possible?
I don't believe you can add another line but you could modify the placement of the warning indicator (although it won't be dynamic)
Here's the link to the available properties for the gauges(Advanced XML)
http://docs.splunk.com/Documentation/Splunk/4.3.3/Developer/CustomChartingConfig-ChartLegend#fillerg...
~Kate