| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| encoding/hex | Package hex implements hexadecimal encoding and decoding. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| go.opentelemetry.io/otel/api/core | |
| go.opentelemetry.io/otel/api/distributedcontext | |
| go.opentelemetry.io/otel/api/key | |
| go.opentelemetry.io/otel/api/propagation | |
| go.opentelemetry.io/otel/api/trace | |
| net/url | Package url parses URLs and implements query escaping. |
| regexp | Package regexp implements regular expression search. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |