@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        ClusterId that = (ClusterId) o;
        return application.equals(that.application) && cluster.equals(that.cluster);
    }
Identifies a cluster in an application.

@author mpolden
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/node/ClusterId.java