HTTP REST Api endpoint labels

• /labels

  • Supported for Prometheus API
  • This endpoint lists the labels for each PrometheusExporter metrics scrape endpoint. If the sensor for a scrape endpoint is not enabled, the labels list for that endpoint will be missing.

Prometheus API

Example output:
```console
# curl https://9.152.187.46:9250/labels -k -u scale_admin:TXlWZXJ5U3Ryb25nUGFzc3cwcmQhCg== | jq .
% Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  1212  100  1212    0     0  34628      0 --:--:-- --:--:-- --:--:-- 35647
{
  "/metrics_gpfs_filesystem": [
    "node",
    "gpfs_cluster_name",
    "gpfs_fs_name"
  ],
  "/metrics_gpfs_nsddisk": [
    "node",
    "gpfs_disk_name"
  ],
  "/metrics_gpfs_nsdpool": [
    "node",
    "gpfs_fs_name",
    "gpfs_diskpool_name"
  ],
  "/metrics_gpfs_nsdfs": [
    "node",
    "gpfs_fs_name"
  ],
  "/metrics_gpfs_vfsx": [
    "node"
  ],
  "/metrics_gpfs_node": [
    "node"
  ],
  "/metrics_gpfs_nodeapi": [
    "node"
  ],
  "/metrics_gpfs_filesystemapi": [
    "node",
    "gpfs_cluster_name",
    "gpfs_fs_name"
  ],
  "/metrics_gpfs_fileset": [
    "gpfs_cluster_name",
    "gpfs_fs_name",
    "gpfs_fset_name"
  ],
  "/metrics_gpfs_pool": [
    "gpfs_cluster_name",
    "gpfs_fs_name",
    "gpfs_diskpool_name"
  ],
  "/metrics_gpfs_diskcap": [
    "gpfs_cluster_name",
    "gpfs_fs_name",
    "gpfs_diskpool_name",
    "gpfs_disk_name"
  ],
  "/metrics_gpfs_poolcap": [
    "gpfs_cluster_name",
    "gpfs_fs_name",
    "gpfs_diskpool_name",
    "gpfs_disk_usage_name"
  ],
  "/metrics_gpfs_inodecap": [
    "gpfs_cluster_name",
    "gpfs_fs_name"
  ],
  "/metrics_gpfs_mmhealth": [
    "node",
    "gpfs_health_component",
    "gpfs_health_entity"
  ],
  "/metrics_gpfs_tscom": [
    "node",
    "gpfs_tscom_destination",
    "gpfs_tscom_connection"
  ],
  "/metrics_smb_stats": [
    "node",
    "protocol",
    "operation"
  ],
  "/metrics_smb_globalstats": [
    "node"
  ],
  "/metrics_ctdb_stats": [
    "node"
  ],
  "/metrics_ctdb_dbstats": [
    "node",
    "db_name"
  ]
}

```