items map[types.NamespacedName]*serviceChange

	// makeServiceInfo allows the proxier to inject customized information when
	// processing services.
	makeServiceInfo makeServicePortFunc
	// processServiceMapChange is invoked by the apply function on every change. This
	// function should not modify the ServicePortMaps, but just use the changes for
	// any Proxier-specific cleanup.
	processServiceMapChange processServiceMapChangeFunc

)

// IPSetVersioner can query the current ipset version.
type IPSetVersioner interface {
	// returns "X.Y"
	GetVersion() (string, error)
}

// IPSet wraps util/ipset which is used by IPVS proxier.
type IPSet struct {
	utilipset.IPSet
	// activeEntries is the current active entries of the ipset.
	activeEntries sets.Set[string]
	// handle is the util ipset interface handle.
	handle utilipset.Interface
}

  /**
   * By default delegates to {@link Object#hashCode}. The dynamic proxies' {@code hashCode()} will
   * delegate to this method. Subclasses can override this method to provide custom equality.
   */
  @Override
  public int hashCode() {
    return super.hashCode();
  }

  /**
   * By default delegates to {@link Object#toString}. The dynamic proxies' {@code toString()} will

  /**
   * By default delegates to {@link Object#hashCode}. The dynamic proxies' {@code hashCode()} will
   * delegate to this method. Subclasses can override this method to provide custom equality.
   */
  @Override
  public int hashCode() {
    return super.hashCode();
  }

  /**
   * By default delegates to {@link Object#toString}. The dynamic proxies' {@code toString()} will

// Determining the URL requires sending network traffic to proxies,
// so this work is delayed until we need to download something from
// the database. If everything we need is in the local cache and
// c.ReadRemote is never called, we will never do this work.
func (c *dbClient) initBase() {
	if c.base != nil {
		return
	}

	// Try proxies in turn until we find out how to connect to this database.
	//

		p.MarkDone(proxies[0])
		p.Enqueue(proxies[0], &model.PushRequest{})
		ExpectDequeue(t, p, proxies[0])
		ExpectTimeout(t, p)
	})

	t.Run("add and remove and add and markdone", func(t *testing.T) {
		t.Parallel()
		p := NewPushQueue()
		defer p.ShutDown()

		p.Enqueue(proxies[0], &model.PushRequest{})
		ExpectDequeue(t, p, proxies[0])
		p.Enqueue(proxies[0], &model.PushRequest{})

    private List<Server> servers;

    private List<Proxy> proxies;

    private List<SettingsProblem> problems;

    DefaultSettingsDecryptionResult(List<Server> servers, List<Proxy> proxies, List<SettingsProblem> problems) {
        this.servers = (servers != null) ? servers : new ArrayList<>();
        this.proxies = (proxies != null) ? proxies : new ArrayList<>();

        return this;
    }

    @Override
    public List<Proxy> getProxies() {
        if (proxies == null) {
            proxies = new ArrayList<>();
        }

        return proxies;
    }

    @Override
    public DefaultSettingsDecryptionRequest setProxies(List<Proxy> proxies) {
        this.proxies = proxies;

        return this;
    }

    SettingsDecryptionRequest setServers(List<Server> servers);

    /**
     * Gets the proxies whose passwords should be decrypted.
     *
     * @return The proxies to decrypt, never {@code null}.
     */
    List<Proxy> getProxies();

    /**
     * Sets the proxies whose passwords should be decrypted.
     *
     * @param proxies The proxies to decrypt, may be {@code null}.
     * @return This request, never {@code null}.
     */

  - 28516
upgradeNotes:
  - title: Connectivity issues among your proxies when updating from 1.7.x to 1.7.5 or newer.
    content: |
      When upgrading your Istio data plane from 1.7.x (where x < 5) to 1.7.5 or newer, you may 
      observe connectivity issues between your gateway and your sidecars or among your sidecars 
      with 503 errors in the log. This happens when 1.7.5+ proxies send HTTP 1xx or 204 response