Behaviour in application servers with multiple deployments

[pavolloffay]

Define behavior in application servers with multiple deployments.

In OpenTracing each app could get a unique tracer instance with its configuration.

OpenTelemetry provides SPI to resolve a tracer, but it might not resolve a unique tracer in app servers with multiple deployments open-telemetry/opentelemetry-java#308

[pavolloffay]

Some related issues:

• Skip pattern for multiple applications microprofile/microprofile-opentracing#119

[fmhwong]

The current OpenTelemetry Java API doesn't support having multiple services in a Java process.

Opened open-telemetry/opentelemetry-java#1109 and brought this up in the Java sync meetup on 4/24/2020.