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Collector mode only: this applies when AppSignal for Ruby runs in collector mode. It has no effect otherwise.
Distributed tracing shows a request as one trace across every service it passed through. AppSignal for Ruby does this for the integrations below. You do not have to pass anything between your services.

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HTTP clients

Requests made with these libraries carry the current trace to the service being called:

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HTTP servers

Requests that arrive carrying a trace continue it:

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Background jobs

Jobs run in the same trace as the code that enqueued them: How the trace reaches a job differs per library. Each integration’s page describes its own behavior and limits.