@Override
        public String toString() {
            StringJoiner joiner = new StringJoiner(", ", "dev settings: ", "").setEmptyValue("no dev settings");
            athenzService.ifPresent(service -> joiner.add("athenz-service: " + service.value()));
            cloudAccounts.ifPresent(cas -> joiner.add(cas.entrySet().stream().map(ca -> ca.getKey() + ": " + ca.getValue()).collect(joining(", ", "cloud accounts: ", ""))));
            hostTTL.ifPresent(ttl -> joiner.add("host-ttl: " + ttl));
            if ( ! tags.isEmpty()) joiner.add("tags: " + tags);
            if ( ! zoneEndpoints.isEmpty()) joiner.add("endpoint settings for clusters: " + zoneEndpoints.keySet().stream().map(ClusterSpec.Id::value).collect(joining(", ")));
            return joiner.toString();
        }
Returns the major version that deprecated this element
config-model-api/src/main/java/com/yahoo/config/application/api/DeploymentSpec.java