curl --request GET \
  --url https://api.example.com/metrics \
  --header 'Authorization: Bearer <token>'

{
  "items": {
    "total": 123,
    "by_state": {}
  },
  "blobs": {
    "count": 123,
    "total_bytes": 123
  },
  "types": {
    "core": 123,
    "custom": 123
  },
  "keys": {
    "total": 123
  },
  "webhooks": {
    "total": 123
  },
  "uptime_seconds": 123,
  "cached_at": "<string>"
}