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Enrich Zipkin db tracing
Add info regarding
- database type and address
- approximation for queries results size
What db traces looked like before enrichment:
How they look like ~~now~~ (see https://github.com/microservices-demo/user/pull/56#issuecomment-347187263):
I was inspired by https://github.com/opentracing/specification/blob/master/semantic_conventions.md for choosing some binary annotations keys.
Relates to https://github.com/microservices-demo/microservices-demo/issues/755
Improved to include spans' cs
and cr
annotations: