Description of problem:
  Capacity Available, Weekly Growth Rate and Weeks Remaining values are
  affected by selected time range.

  The question is, if it is expected or not?
  How should change the values of above mentioned metrics, if I'll change the
  time range or should they change at all?

Version-Release number of selected component (if applicable):
  grafana-4.3.2-3.el7rhgs.x86_64
  tendrl-ansible-1.6.3-7.el7rhgs.noarch
  tendrl-api-1.6.3-5.el7rhgs.noarch
  tendrl-api-httpd-1.6.3-5.el7rhgs.noarch
  tendrl-commons-1.6.3-12.el7rhgs.noarch
  tendrl-grafana-plugins-1.6.3-11.el7rhgs.noarch
  tendrl-grafana-selinux-1.5.4-2.el7rhgs.noarch
  tendrl-monitoring-integration-1.6.3-11.el7rhgs.noarch
  tendrl-node-agent-1.6.3-10.el7rhgs.noarch
  tendrl-notifier-1.6.3-4.el7rhgs.noarch
  tendrl-selinux-1.5.4-2.el7rhgs.noarch
  tendrl-ui-1.6.3-11.el7rhgs.noarch

How reproducible:
  100%

Steps to Reproduce:
1. Prepare Gluster Storage Cluster imported into RHGS WA and let it running
  for more than week with some data load.
  Or use usmqe-carbon-mock-data-generator[1] to generate historical data on
  freshly installed cluster.
2. Open Grafana Cluster Dashboard and check Capacity Available, Weekly Growth
  Rate and Weeks Remaining metrics.
3. Change selected Time range (from the upper right corner) and watch the
  previously mentioned metrics.

Actual results:
  The Capacity Available, Weekly Growth Rate and Weeks Remaining metrics are
  affected by the change of selected Time Range and it is not clear how exactly.

Expected results:
  It should be clear, how the above mentioned metrics are affected by changing
  Time range or if they might be affected at all.

Additional info:
[1] https://github.com/dahorak/usmqe-carbon-mock-data-generator