Monitoring data can now be stored in `metrics-*` patterns when collected through elastic-agent. [Our documentation](https://www.elastic.co/guide/en/kibana/current/monitoring-data.html) recommends to use the `monitoring_user` role to view the data in Stack Monitoring application but that role does not have permissions to read from the metrics pattern.

`monitoring_user` should be allowed the same permissions on `metrics-*` as `.monitoring-*`
x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authz/RBACEngineTests.java
import org.elasticsearch.xpack.core.security.authz.privilege.ApplicationPrivilegeTests;
import org.elasticsearch.xpack.core.security.authz.privilege.ConfigurableClusterPrivileges.ManageApplicationPrivileges;
import org.elasticsearch.xpack.core.security.authz.privilege.IndexPrivilege;
import org.elasticsearch.xpack.core.security.authz.privilege.Privilege;
import org.elasticsearch.xpack.core.security.authz.store.ReservedRolesStore;
import org.elasticsearch.xpack.core.security.support.Automatons;
import org.elasticsearch.xpack.core.security.test.TestRestrictedIndices;
import org.elasticsearch.xpack.core.security.user.User;
import org.elasticsearch.xpack.security.authc.esnative.ReservedRealm;
import org.elasticsearch.xpack.security.authz.RBACEngine.RBACAuthorizationInfo;
import org.elasticsearch.xpack.security.authz.store.CompositeRolesStore;
import org.hamcrest.Matchers;
import org.junit.Assert;
import org.junit.Before;
import org.mockito.Mockito;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.TreeMap;
import java.util.concurrent.ExecutionException;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import static java.util.Collections.emptyMap;