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CloudEvents

CloudEvents is a specification that defines a common envelope for event data so that different systems can produce and consume events interoperably. It standardizes metadata fields like source, type, and subject across messaging systems, serverless platforms, and event-driven architectures.

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CloudEvents

CloudEvents is a vendor-neutral specification for describing event data in a common way. It gives producers, consumers, and intermediaries a shared envelope for an event's identity and context.

The specification solves a translation problem. Event platforms often describe the same ideas with different field names and layouts. A consumer then needs custom parsing for every source. CloudEvents defines a small information model and rules for carrying it through formats and protocols.

CloudEvents does not replace your event broker, message protocol, or payload schema. It standardizes the description of an event while leaving those choices to your system.

The mental model: a labeled package

Think of a CloudEvent as a package with a standard shipping label.

CloudEvent
├── context attributes   standard labels about the event
│   ├── identity         id + source
│   ├── interpretation   specversion + type
│   └── useful detail    subject, time, content type, schema, extensions
└── data                 domain-specific payload about the occurrence

The context attributes let infrastructure inspect, route, log, and filter an event without understanding its domain-specific data. The data carries the business or technical details that the consumer needs.

An event records a fact about an occurrence. It does not name a routing destination. A message transports that event from a source toward a consumer. This distinction keeps the event description separate from the delivery mechanism.

Follow the event roles

CloudEvents defines vocabulary for the parts of an event flow:

occurrence -> source -> producer -> message -> intermediary -> consumer

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