Grafana is not collecting all metrics from influxdb

maybe query is wrong can you use the right measurement name ?

from(bucket: "VCENTER_BUCKET")
  |> range(start: v.timeRangeStart, stop: v.timeRangeStop)
  |> filter(fn: (r) => r["_measurement"] == "????????")

what is your version of grafana ?
you should look at this, i believe it’s a config issue

What is the bucket list you have on your first screen ? where are these buckets ?
look like measurement field to me.