Report java version as process tag

[quaff]

In a large organization, there is numbers of services deployed base on different version jdk, Java version should be collected as built-in tag.
It's better jaeger spark job and ui can provide a list view for specified tag (here is java.version), something like:

Service	Tag (java.version)
A	1.8.0_181
B	1.8.0_181
C	9
D	10.0.2

[yurishkuro]

I have to disagree, for two reasons:

• it's going to add massive amount of redundant data in the tracing backend. Presumably, an organization can get a breakdown of app->Java version by other means.

• if your organization still wants to go in this direction, you can easily add the tags to the tracer through other means, eg via env variables. But if we add it to the core lib, everyone will get this whether they want it or not.

[quaff]

It's OK, I thought it would be a general feature. The point is the second section, I reported jaegertracing/jaeger-ui#246

[jpkrohling]

I'm closing this, as I think @yurishkuro has a great point :)

In any case, thanks for the PR! Keep sending your ideas, perhaps opening an issue on the repository first to discuss whether it would be merged.