The default graphs in that dashboard would lead to an 'extra' dimension as they have mulitple series on the same chart.
You could split out each of the functions:
## $SPLUNK_HOME/etc/apps/unix/local/macros.conf
## existing macro in the Dashboard
[Mem_Usage_for_Host(1)]
args = host
definition = index=os sourcetype=vmstat host=$host$ | multikv fields memFreePct, memUsedPct, swapUsedPct | timechart median(memFreePct) as Percent_Mem_Free, median(memUsedPct) as Percent_Mem_Used, median(swapUsedPct) as Percent_Swap
## new macros
[Mem_Free_for_Host(1)]
args = host
definition = index=os sourcetype=vmstat host=$host$ | multikv fields memFreePct, memUsedPct, swapUsedPct | timechart median(memFreePct) as Percent_Mem_Free by host
[Mem_Used_for_Host(1)]
args = host
definition = index=os sourcetype=vmstat host=$host$ | multikv fields memFreePct, memUsedPct, swapUsedPct | timechart median(memUsedPct) as Percent_Mem_Used by host
[Mem_Swap_for_Host(1)]
args = host
definition = index=os sourcetype=vmstat host=$host$ | multikv fields memFreePct, memUsedPct, swapUsedPct | timechart median(swapUsedPct) as Percent_Swap by host
And then switch out the view by placing the below into $SPLUNK_HOME/etc/apps/unix/local/data/ui/views/mem_by_host.xml
<form class="formsearch">
<label>Memory by Host</label>
<fieldset>
<input type="dropdown" token="host" searchWhenChanged="true">
<label>Host:</label>
<default>localhost</default>
<populatingSearch fieldForValue="host" fieldForLabel="host">| metadata type=hosts index=os</populatingSearch>
<choice value="*">all</choice>
</input>
<input type="time" searchWhenChanged="true"/>
</fieldset>
<row>
<html><center><h1>Memory by Host</h1></center></html>
</row>
<row>
<chart>
<title>Percent Memory Free by Host</title>
<searchTemplate>`Mem_Free_for_Host($host$)`</searchTemplate>
<option name="charting.chart">line</option>
<option name="charting.secondaryAxisTitle.text">% Mem Free</option>
</chart>
<chart>
<title>Percent Memory Used by Host</title>
<searchTemplate>`Mem_Used_for_Host($host$)`</searchTemplate>
<option name="charting.chart">line</option>
<option name="charting.secondaryAxisTitle.text">% Mem Used</option>
</chart>
<chart>
<title>Percent Memory Swap by Host</title>
<searchTemplate>`Mem_Swap_for_Host($host$)`</searchTemplate>
<option name="charting.chart">line</option>
<option name="charting.secondaryAxisTitle.text">% Mem Swap</option>
</chart>
</row>
<row>
<table>
<title>Physical Memory by Host</title>
<searchTemplate>`Memory_Hardware_by_Host($host$)`</searchTemplate>
</table>
</row>
</form>
... View more
