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Probe protocols describe and define how agents send collected metrics, logs, traces, and events, as well as set out the format of each entity.
There are two types of protocols that help language agents work in distributed tracing.
Cross Process Propagation Headers Protocol v3 has been the new protocol for in-wire context propagation since the version 8.0.0 release.
Cross Process Correlation Headers Protocol v1 is a new in-wire context propagation protocol which is additional and optional. Please read SkyWalking language agents documentation to see whether it is supported.
SkyWalking Trace Data Protocol v3 defines the communication method and format between the agent and backend.
SkyWalking has a native metrics format, and supports widely used metric formats, such as Prometheus, OpenCensus, and Zabbix.
The native metrics format definition could be found here. Typically, the agent meter plugin (e.g. Java Meter Plugin) and Satellite Prometheus fetcher would convert metrics into native format and forward them to SkyWalking OAP server.
To learn more about receiving 3rd party formats metrics, see Meter receiver and OpenTelemetry receiver.
The browser probe, such as skywalking-client-js, could use this protocol to send data to the backend. This service is provided by gRPC.
SkyWalking Browser Protocol defines the communication method and format between skywalking-client-js
and backend.
The protocol is used to report events to the backend. The doc introduces the definition of an event, and the protocol repository defines gRPC services and message formats of events.
JSON
format events can be reported via HTTP API. The endpoint is http://<oap-address>:12800/v3/events
.
Example of a JSON event record:
[
{
"uuid": "f498b3c0-8bca-438d-a5b0-3701826ae21c",
"source": {
"service": "SERVICE-A",
"instance": "INSTANCE-1"
},
"name": "Reboot",
"type": "Normal",
"message": "App reboot.",
"parameters": {},
"startTime": 1628044330000,
"endTime": 1628044331000
}
]
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