Report elasticcloud data tiers nodes roles

[christophemorio]

Hello,

On ElasticCloud clusters, nodes have specific roles regarding data tier leveling:

• data_hot
• data_warm
• data_cold
• data_frozen

GET /_nodes/stats
...
      "roles": [
        "master",
        "remote_cluster_client"
      ],
...
      "roles": [
        "data_frozen"
      ],
...
      "roles": [
        "data_content",
        "data_hot",
        "ingest",
        "remote_cluster_client",
        "transform"
      ],
...
      "roles": [
        "data_warm",
        "remote_cluster_client"
      ],
 ...
      "roles": [
        "data_cold",
        "remote_cluster_client"
      ],

In ElasticCloud setup, metrics elasticsearch_nodes_roles reports only master, client and ingest.

$ curl -s http://localhost:9108/metrics | grep 'elasticsearch_nodes_roles'
# HELP elasticsearch_nodes_roles Node roles
# TYPE elasticsearch_nodes_roles gauge
elasticsearch_nodes_roles{cluster="xxxx",host="172.22.138.46",name="instance-0000000016",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.22.138.46",name="instance-0000000016",role="ingest"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.22.143.78",name="instance-0000000015",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.22.143.78",name="instance-0000000015",role="ingest"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.236.46",name="instance-0000000003",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.238.200",name="instance-0000000019",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.238.200",name="instance-0000000019",role="master"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.241.205",name="instance-0000000021",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.241.47",name="instance-0000000022",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.242.154",name="instance-0000000018",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.242.154",name="instance-0000000018",role="master"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.242.162",name="instance-0000000007",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.245.96",name="instance-0000000020",role="client"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.245.96",name="instance-0000000020",role="master"} 1
elasticsearch_nodes_roles{cluster="xxxx",host="172.25.246.94",name="instance-0000000010",role="client"} 1

Roles data_* are required to set proper alerts.
e.g. data_frozen reporting full disk usage is likely to less critical since it's only for caching.