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/core/src/test/java/org/elasticsearch/xpack/core/security/authz/store/ReservedRolesStoreTests.java
assertThat(ingestAdminRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction("foo")), is(false));
        assertThat(
            ingestAdminRole.indices().allowedIndicesMatcher("indices:foo").test(mockIndexAbstraction(randomAlphaOfLengthBetween(8, 24))),
            is(false)
        );
        assertThat(
            ingestAdminRole.indices().allowedIndicesMatcher(GetAction.NAME).test(mockIndexAbstraction(randomAlphaOfLengthBetween(8, 24))),
            is(false)
        );
        assertNoAccessAllowed(ingestAdminRole, TestRestrictedIndices.SAMPLE_RESTRICTED_NAMES);
        assertNoAccessAllowed(ingestAdminRole, XPackPlugin.ASYNC_RESULTS_INDEX + randomAlphaOfLengthBetween(0, 2));
    }
    public void testKibanaSystemRole() {
        final TransportRequest request = mock(TransportRequest.class);
        final Authentication authentication = randomValueOtherThanMany(
            Authentication::isApiKey,  
            () -> AuthenticationTestHelper.builder().build()
        );
        RoleDescriptor roleDescriptor = new ReservedRolesStore().roleDescriptor("kibana_system");
        assertNotNull(roleDescriptor);
        assertThat(roleDescriptor.getMetadata(), hasEntry("_reserved", true));
        Role kibanaRole = Role.buildFromRoleDescriptor(roleDescriptor, new FieldPermissionsCache(Settings.EMPTY), RESTRICTED_INDICES);
        assertThat(kibanaRole.cluster().check(ClusterHealthAction.NAME, request, authentication), is(true));
        assertThat(kibanaRole.cluster().check(ClusterStateAction.NAME, request, authentication), is(true));
        assertThat(kibanaRole.cluster().check(ClusterStatsAction.NAME, request, authentication), is(true));
        assertThat(kibanaRole.cluster().check(PutIndexTemplateAction.NAME, request, authentication), is(true));
        assertThat(kibanaRole.cluster().check(GetIndexTemplatesAction.NAME, request, authentication), is(true));
        assertThat(kibanaRole.cluster().check(ClusterRerouteAction.NAME, request, authentication), is(false));
        assertThat(kibanaRole.cluster().check(ClusterUpdateSettingsAction.NAME, request, authentication), is(false));
        assertThat(kibanaRole.cluster().check(MonitoringBulkAction.NAME, request, authentication), is(true));