Update metrics + emit a 'load' event after one attribute-array load. Load latency is measured from the FIRST active query's startTime (the demand query that triggered this load), so the active-query registration must precede the array loads.
Update metrics + emit a 'load' event after one attribute-array load. Load latency is measured from the FIRST active query's startTime (the demand query that triggered this load), so the active-query registration must precede the array loads.