| 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/attribute | Package attribute provides key and value attributes. |
| go.opentelemetry.io/otel/internal/baggage | Package baggage provides base types and functionality to store and retrieve baggage in Go context. |
| go.opentelemetry.io/otel/trace | Package trace provides an implementation of the tracing part of the OpenTelemetry API. |
| net/http | Package http provides HTTP client and server implementations. |
| 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. |