Count of elements in queue as number of segments currently queued for query for exports

Example Metric Record:

json
{
   "#repo" : "humio-metrics",
   "#type" : "metrics",
   "@host" : "1",
   "@id" : "RFqPuCKcrRXVfDtkjx7v7Tys_25_840_1714449382",
   "@ingesttimestamp" : "1714449382858",
   "@timestamp" : 1714449382807,
   "@timestamp.nanos" : "0",
   "@timezone" : "UTC",
   "name" : "local-query-segments-queue-exports-part",
   "type" : "GAUGE",
   "value" : "0"
}