Anything I add for showing zero-count results is causing drilldown to fail (default drilldown). This one shows zero-count results and drilldown works too, but in the output bar chart, you need to 'stack' the bars.
index=hpov eph AND (tag="EPH_SVR") (" error " OR " exception " OR " EXCEPTION " | eval test=1| eval Type=case(like(_raw,"% error %"),"Error",like(_raw,"% exception %"),"exception",like(_raw,"% EXCEPTION %"),"EXCEPTION") | stats count(eval(Type="Error")) as CountError count(eval(Type="exception")) as CountWarning count(eval(Type="EXCEPTION")) as CountInfo by Type
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