Tracer support in cosmosdb

[simplynaveen20]

Added tracer support on all the public api

Sample view from the JaegerUi

Following below points

End to end public api capture

No nested spans will be captured only capturing parent call

Span name "."
For query "method name>..”

Span attributes
db.type (cosmosdb)
db.instance(Database name)
db.statement(exact same as span name)
db.url(cosmos account uri)

In case of exception
error.msg(throwable.getMessage())
error.type(throwable.getClass().getName())
error.stack(throwable.printStackTrace())

Span status(both in succes and failure) - Comos status code (HttpBased)

[trask]

Some comments below, mainly about the context propagation code (I was using your code to learn about Reactor context propagation myself 😄, so thank you!).

Btw, I really like the Jaeger screenshot! 👍

[moderakh]

Thanks Naveen, Great work.

I added some comments, also could you please measure the perf
before and after this PR.

using both the internal benchmark and the jmh based benchmark?

[moderakh]

CosmosPagedFlux allows both paginated iteration and also item by item iteration.

I see that we covered the pageByPage iteration through adding CosmosPagedFlux#byPage(.) what about the item by item iteration shouldn't we cover the item by item usage too?

[moderakh]

I added a few minor comments.

Please address. other than that LGTM.

[samvaity]

LGTM, apart from few comments

[simplynaveen20]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[simplynaveen20]

/azp run java - cosmos - tests

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).