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(logstashAdminRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction("foo")), is(false));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction(".reporting")), is(false));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction(".logstash")), is(true));
        assertThat(
            logstashAdminRole.indices().allowedIndicesMatcher("indices:foo").test(mockIndexAbstraction(randomAlphaOfLengthBetween(8, 24))),
            is(false)
        );
        final String index = ".logstash-" + randomIntBetween(0, 5);
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(DeleteAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(DeleteIndexAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(CreateIndexAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(IndexAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(GetAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(SearchAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(logstashAdminRole.indices().allowedIndicesMatcher(MultiSearchAction.NAME).test(mockIndexAbstraction(index)), is(true));
        assertThat(
            logstashAdminRole.indices().allowedIndicesMatcher(UpdateSettingsAction.NAME).test(mockIndexAbstraction(index)),
            is(true)
        );
    }
    private IndexAbstraction mockIndexAbstraction(String name) {
        IndexAbstraction mock = mock(IndexAbstraction.class);
        when(mock.getName()).thenReturn(name);
        when(mock.getType()).thenReturn(
            randomFrom(IndexAbstraction.Type.CONCRETE_INDEX, IndexAbstraction.Type.ALIAS, IndexAbstraction.Type.DATA_STREAM)
        );
        return mock;
    }
}