AIX lpar measurement issue in some queries when comparing to cpu_all

In some dashboards, queries will return both lpar and cpu_all results and filter out the unrequired measurement if lpar is available:

| eval usage=if(isnum(vp_usage), vp_usage, pct_usage)

There can be rare cases where this will return the wrong measure if cpu_all is available in a given timestamp where lpar is not (and lpar is available)

This can be replaced by a more robust condition:

| eventstats count(eval(vp_usage>0)) as count_lpar | eval usage=if(count_lpar>0, vp_usage, pct_usage)

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