code: public PagedList<ManagedInstanceKeyInner> listByInstance(final String resourceGroupName, final String managedInstanceName, final String filter) {
          ServiceResponse<Page<ManagedInstanceKeyInner>> response = listByInstanceSinglePageAsync(resourceGroupName, managedInstanceName, filter).toBlocking().single();
          return new PagedList<ManagedInstanceKeyInner>(response.body()) {
              @Override
              public Page<ManagedInstanceKeyInner> nextPage(String nextPageLink) {
                  return listByInstanceNextSinglePageAsync(nextPageLink).toBlocking().single().body();
              }
          };
      }
docs: Gets a list of managed instance keys.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param managedInstanceName The name of the managed instance.
  @param filter An OData filter expression that filters elements in the collection.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws CloudException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent
  @return the PagedList&lt;ManagedInstanceKeyInner&gt; object if successful.