[APM] Display a warning on the Service Map when multiple services point to the same exit span

[crespocarlos]

Summary

With the new implementation of the Service Map API, multiple services connection originating from the load balancers may cause the map to be incomplete. Another consequence because of the nature of the new implementation, ie: getting the first combination of service.name + span.destination.service.resource found, the map could change every time the page refreshes and this will cause confusion to users.

To facilitate troubleshooting we want to display a warning on the service map when such a case is identified.

Example:

The warning could be improved in the future to include other common problems that can be identified using known heuristics in the data.

AC

• When span.destination.service.resource points to more than 1 service, a warning is displayed