[Stack Monitoring] Telemetry support for metrics-* agent data

[neptunian]

In the past based on #73141 we implemented telemetry for Stack Monitoring #75878. Since then, it doesn't look like we've used this data or created any charts in in the Stack Monitoring space https://kibana.telemetry.elastic.co/.

Other that one query that telemetry is using fetchClusters which was modified to query metrics-elasticsearch-* as part of its index pattern, we are not querying for metrics-* data. Should we? If so, is it a priority since we don't seem to be doing anything with telemetry data? There is a metricbeatIsUsed value that is determined from the queries and we would probably want to do something similar if index is metrics.

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[smith]

Since we're not currently doing anything with this data I'm going to close this.

[klacabane]

Reopening to investigate telemetry possibilities
Adding a property to signal agent usage would be great, the data is already indexed in the telemetry cluster but we'll probably have to update mappings somewhere. @ravikesarwani (pinging from #73141) do you know if we built a dashboard with this data ?

We should also look at the current capabilities of package telemetry. it should provide more insights like version installed, number of agents or options enabled

[smith]

Since we're not currently doing anything with this data I'm going to close this.