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@itsme - volume.size is derived from notifications sent by cinder. This is quite enough cause this meter states simple fact - the size of volume is N GB. U don't have info how much space is in use inside it. When volume is resized U'll receive new notification with updated value. So my suggestion is to use the last sample for the specific volume.

ip.floating meter can be polled on regular intervals. So this shouldn't cause any problems. Next snippet from pipeline.yaml show how to poll it every 10 min:

- name: floating_source
  interval: 600
  meters:
    - "ip.floating"
  sinks:
    - meter_sink