emc-openstack / storops / 358

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travis-ci

[GH-55] Add realtime metric support. (#58)

Add subscription support for realtime metric.

Details:
* List metric resources.
* List/Create/Delete metric real time query.
* Query metric query result.
* Add `RepeatedTimer` utility for management of repeated tasks.
* List disks.
* Add calculators meta info manager.
* Enable/Disable real time metric collection.
* Add metric properties in printed string of resource/resource list.
* Add basic persist stats to csv support.
* Allow enable certain resource types of metrics monitoring.
* Add badge from `landscape.io`.

Add following metrics:
* disk
  * read IOPS
  * write IOPS
  * read bandwidth
  * write bandwidth
  * utilization
* lun
  * read IOPS
  * write IOPS
  * read bandwidth
  * write bandwidth
  * utilization
* filesystem
  * read IOPS
  * write IOPS
  * read bandwidth
  * write bandwidth
* storage processor
  * net in bandwidth
  * net out bandwidth
  * block read IOPS
  * block write IOPS
  * block read bandwidth
  * block write bandwidth
  * CIFS read IOPS
  * CIFS write IOPS
  * CIFS read bandwidth
  * CIFS write bandwidth
  * NFS read IOPS
  * NFS write IOPS
  * NFS read bandwidth
  * NFS write bandwidth
  * utilization
  * block cache read hit ratio
  * block cache write hit ratio
  * core count
  * temperature

699 of 699 new or added lines in 14 files covered. (100.0%)

9371 of 10043 relevant lines covered (93.31%)

2.8 hits per line