- name: stats
  type: group
  description: >
    Stats about the Prometheus server.
  release: beta
  fields:
    - name: notifications
      type: group
      description: >
        Notification stats.
      fields:
        - name: queue_length
          type: long
          description: >
            Current queue length.
        - name: dropped
          type: long
          description: >
            Number of dropped queue events.
    - name: processes.open_fds
      type: long
      description: >
        Number of open file descriptors.
    - name: storage.chunks_to_persist
      type: long
      description: >
        Number of memory chunks that are not yet persisted to disk.