seqdiag {
    node_width = 100;
    edge_length = 150;

    "Client"
    "Tacker-server"
    "Tacker-conductor"
    "TackerDB"

    "Client" -> "Tacker-server"
      [label = "Trigger operation sending notification"];
    "Tacker-server" -> "Tacker-conductor"
      [label = "send_notification"];
    "Tacker-conductor" -> "TackerDB"
      [label = "Get specific vnf instance id"];
    "Tacker-conductor" <-- "TackerDB"
      [label = "vnf instance id"];
    "Tacker-conductor" -> "Tacker-conductor"
      [label = "Filters the subscriptions by a specific vnfdid"];
    "Client" <- "Tacker-conductor"
      [label = "Sends Notify filtered on a specific vnfdid."];
    "Client" --> "Tacker-conductor"
      [label = "response"];
    "Tacker-server" <-- "Tacker-conductor"
      [label = "return"];
  }