<results> 
  <histogram hits='2664'>
    <g k='0' c='3'/>
    <g k='5' c='39'/>
    <g k='20' c='2081'/>
    <g k='47' c='1'/>
    <g k='48' c='3'/>
    <g k='50' c='1'/>
    <g k='52' c='256'/>
    <g k='54' c='41'/>
    <g k='57' c='6'/>
    <g k='59' c='5'/>
    <g k='60' c='227'/>
    <g k='61' c='1'/>
  </histogram>
</results>  

results - Histogram data showing result codes from SNF message scans.

results/histogram@hits - Number of total events in the histogram.

results/histogram/g - Group data for a single group in the histogram.

results/histogram/g@k - Key value for a group in the histogram.

results/histogram/g@c - Count of the events for a group in the histogram. In the above example, the histogram shows that during this period the result code 20 occurred 2081 times. That is precisely what the event counter for truncate says and approximately the rate of truncate events per minute (2020.98).