Traces give us the big picture of what happens when a request is made by user or an application.
In OpenTelemetry, a Signal refers to the categories of telemetry that are supported by the specification. It currently supports the Signals below, and more may be added in the future.
A metric is a measurement about a service, captured at runtime.
A log is a timestamped text record, either structured (recommended) or unstructured, with metadata.
Baggage refers to contextual information that’s passed between spans