OpenTracing Specification Official Website: http://opentracing.io/spec.
The opentracing/specification repository is a place to document (and discuss) the OpenTracing specification itself (independent of any particular language or platform).
Historically this activity took place on the docs repo (github.com/opentracing/opentracing.io), but that became awkward since trivial website presentation and highly non-trivial semantic discussions were happening under the same namespace. The specification repository was thus proposed as part of opentracing.io#144.
There are two important files in this repository:
specification.md, a versioned description of the current pan-language OpenTracing standardsemantic_conventions.md, a document describing conventional Span tags and log keys for common semantic scenarios