.es(timefield=@timestamp), .es(offset=-1M, timefield=@timestamp) creates separate series in the Timelion chart showing count aggregations for the current time range and the same time range minus one month. So if your time range is set to July 1 to July 6, the offset will add a series to the chart for June 1 to June 6.
You can change the aggregation to average by adding the metric=avg:<field> parameter to your expressions.
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