Gnocchi

Overview
Installation
Related content

Grafana Gnocchi datasource

Gnocchi datasource for Grafana >= 4

Installation via grafana.net

$ sudo grafana-cli plugins install gnocchixyz-gnocchi-datasource

Installation from sources

$ npm install $ ./run-tests.sh # This also build the plugin under dist/

$ ln -s dist /var/lib/grafana/plugins/grafana-gnocchi-datasource $ # or $ cp -a dist /var/lib/grafana/plugins/grafana-gnocchi-datasource

Configuration Panel

Name	Description
Name	The data source name.
Default	Default data source means that it will be pre-selected for new panels.
Url	The http protocol, ip and port of your Keystone or Gnocchi server (default port is usually 8080)
Access	Proxy = access via Grafana backend, Direct = access directory from browser.
Token	A valid Keystone token
Project	The keystone user
User	The Keystone user
Password	The Keystone password

Note: If the Keystone server is set as URL, the Gnocchi server will be autodiscovered. This works only if Access = Direct, and CORS is properly configured on Keystone and Gnocchi side.

Query editor

The editor leverage thes Dynamic Aggregate API of Gnocchi:

Select first the resource type you are looking for.
Create a query to select all resources you need.
Create an operation that selects metric and does math on/between them.
Set label to name each graph with text or with resource attributes.

The Query format is documented as STRING format in Resource search section of Gnocchi documentations. The Operation format is documented in Dynamic Aggregates section of Gnocchi documentations.

Other Query type exists for special use case and for old Gnocchi version that doesn't support Dynamic aggregates

Labels

Labels can be expressed with resources attributes and metric name. To do so attribute must be surrounded by ${} or prefixed by $.

For example, takes the metric regex "cpu_*", the label "$display_name-${host}.foo-$type $metric" and a query that returns these resources::

[
  {
    "display_name": "myfirstvm",
    "host": "compute1",
    "id": "6868da77-fa82-4e67-aba9-270c5ae8cbca",
    "image_ref": "http://image",
    "type": "instance",
    "server_group": "autoscalig_group",
    "metrics": {"cpu_util": "1634173a-e3b8-4119-9eba-fa9a4d971c3b"}
  },
  {
    "display_name": "mysecondvm",
    "host": "compute3",
    "id": "f898ba55-bbea-460f-985c-3d1243348304",
    "image_ref": "http://image",
    "type": "instance",
    "server_group": "autoscalig_group",
    "metrics": {"cpu_util": "58b233f4-65ba-4aeb-97ba-b8bc0feec97e",
                "cpu_time": "6ff95458-97b4-4b08-af03-7d18b05d277e"}
  }
]

The resulting labels are::

myfirstvm-compute1.foo-instance cpu_util mysecondvm-compute3.foo-instance cpu_util mysecondvm-compute3.foo-instance cpu_time

Templated queries

Gnocchi Datasource Plugin provides following functions in Variables values query field in Templating Editor.

Name	Description
`metrics(resource_id)`	Returns a list of metrics available for the resource identified by ‘resource_id’
`resources(resource_type,` attribute`, query)`	Returns a list of resource `attribute` matching `query`.
`resources(resource_type,` attribute1`,` attribute2`, query)`	Returns a list of resource `attribute` matching `query`, `attribute1` is diplayed in selector, `attribute1` used for templating.

For details of Query format, please refer to the Gnocchi and Gnocchi client documentations.

Search for resource - Gnocchi client Documentation for expression format
Search for resource - Gnocchi Documentation for the raw json format.

Current Limitation

Grafana doesn’t allow to query two different servers when using the proxy mode, so we are not able to query Keystone for a token and then query Gnocchi (Except if Gnocchi and Keystone live into the same HTTP host).

In direct mode, CORS MUST be enabled on Keystone and Gnocchi servers.