JAVA J2EE 4 U

 export ETCDCTL_API=3

etcdctl \

  --endpoints="https://etcd1:2379,https://etcd2:2379,https://etcd3:2379" \

  --cacert=/path/to/ca.crt \

  --cert=/path/to/client.crt \

  --key=/path/to/client.key \

  endpoint status --write-out=json |

jq -r '

  def mib: . / 1048576;

  ["ENDPOINT", "DB_MiB", "IN_USE_MiB", "FRAGMENTED_MiB", "FRAGMENTED_%"],

  (

    .[] |

    .Status.dbSize as $total |

    .Status.dbSizeInUse as $used |

    [

      .Endpoint,

      (($total | mib) * 100 | round / 100),

      (($used | mib) * 100 | round / 100),

      ((($total - $used) | mib) * 100 | round / 100),

      ((($total - $used) * 10000 / $total) | round / 100)

    ]

  ) |

  @tsv

' | column -t