| api/core | This package provides basic types used in OpenTelemetry - keys, values, numbers and span contexts. |
| api/distributedcontext | |
| api/global | |
| api/global/internal | |
| api/key | This package provides convenience functions for creating keys and key-value pairs. |
| api/metric | metric package provides an API for reporting diagnostic measurements using three basic kinds of instruments (or four, if calling one special case a separate one). |
| api/propagators | Package propagators contains interface definition for BinaryFormat and TextFormat propagators and implementation of propagators for different format and suppliers. |
| api/testharness | |
| api/trace | |
| api/trace/testtrace | |
| api/unit | |