Added exemplary task manifest with specified disk

Fixes https://github.com/intelsdi-x/snap-plugin-collector-disk/issues/12

Summary of changes:

added exemplary task manifest to show how to request metrics per-disk

How to verify it:

run exemplary task manifest with specified interface (e.g. disk_sda-file.json or disk_sdb-file.json)

Example:

load snap-plugin-collector-disk:

snaptel plugin load snaptel plugin load ./build/linux/x86_64/snap-plugin-collector-disk

create task manifest with a specified dynamic element (disk), see examples/tasks/:


"version": 1,
"schedule": {
"type": "simple",
"interval": "1s"
},
"workflow": {
"collect": {
  "metrics": {
    "/intel/procfs/disk/sda/*": {}
  },
  "config": {
    "/intel/procfs/disk": {
      "proc_path": "/proc"
    }
  },
  "process": null,
  "publish": [
    {
      "plugin_name": "file",
      "config": {
        "file": "/tmp/published_diskstats_sda.log"
      }
    }
  ]
}
}
}

load a declared publisher: snap-plugin-publisher-file:

snaptel plugin load snaptel plugin load <path-to-snap-plugin-publisher-file>

create a task:


$ snaptel task create -t  examples/tasks/disk_sda-file.json

Using task manifest to create task Task created ID: 72166b3e-4236-46ef-89f1-a9088441f113 Name: Task-72166b3e-4236-46ef-89f1-a9088441f113 State: Running


5. watch collected metrics:
(notice, that they come only from specified disk `sda`)

$ snaptel task watch 72166b3e-4236-46ef-89f1-a9088441f113

NAMESPACE DATA TIMESTAMP /intel/procfs/disk/sda/io_time 0 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/merged_read 0 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/merged_write 7.982935636867953 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/octets_read 0 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/octets_write 57221.68264506949 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/ops_read 0 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/ops_write 7.982935636867953 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/pending_ops 0 2016-12-05 12:44:17.94398502 +0100 CET /intel/procfs/disk/sda/weighted_io_time 0 2016-12-05 12:44:17.94398502 +0100 CET

intelsdi-x / snap-plugin-collector-disk