Notices for Telemetry

See General Licenses for copies of general license text.

prometheus	Apache License 2.0	http://www.apache.org/licenses/LICENSE-2.0
grafana	GNU Affero General Public License v3.0 Apache License 2.0	AGPL-3.0-only http://www.apache.org/licenses/LICENSE-2.0
alertmanager	Apache License 2.0	http://www.apache.org/licenses/LICENSE-2.0
elasticsearch_exporter	Apache License 2.0	http://www.apache.org/licenses/LICENSE-2.0