Overview - fillnull IO/Wait pressure

I/O Wait pressure chart should use fillnull value
Fix:
            <chart depends="$chart2$">
                <search depends="$chart2$">
                    <query>| mstats avg(_value) as value where `nmon_metrics_index` metric_name=os.unix.nmon.cpu.cpu_all.Wait_PCT
[ | mstats avg(_value) as value where `nmon_metrics_index` metric_name=os.unix.nmon.cpu.cpu_all.Wait_PCT earliest=-60m latest=now groupby metric_name, OStype, host span=1s
| stats avg(value) as cpu_iowait_percent by host
| sort 30 - cpu_iowait_percent
| table host ] groupby metric_name, OStype, host span=1s
| timechart `nmon_span` limit=0 useother=f avg(value) as cpu_iowait_percent by host
| fillnull value=0</query>
                    <earliest>-4h@m</earliest>
                    <latest>now</latest>
                    <refresh>30s</refresh>
                    <refreshType>delay</refreshType>
                </search>
                <option name="charting.axisTitleX.visibility">collapsed</option>
                <option name="charting.axisTitleY.text">% cpu I/O wait</option>
                <option name="charting.chart">line</option>
                <option name="charting.drilldown">all</option>
                <option name="charting.legend.placement">bottom</option>
                <option name="height">450</option>
                <option name="refresh.display">none</option>
                <drilldown>
                    <link target="_blank">/app/metricator-for-nmon/Nmon_Summary?form.host=$click.name2$&amp;form.timerange.earliest=-4h&amp;form.timerange.latest=now</link>
                </drilldown>
            </chart>
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