- Span: The basic unit of work. Spans can be started and stopped, and they keep track of their timing information. Once you create a span, you must stop it at some point in the future.
- Trace: A set of spans forming a tree-like structure.
- Tracing context: For distributed tracing to work, the tracing context (trace identifier, span identifier, and so on) must be propagated through the process (for example, over threads) and over the network.
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