wu-sheng commented on a change in pull request #6183:
URL: https://github.com/apache/skywalking/pull/6183#discussion_r556189084
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File path: docs/en/concepts-and-designs/event.md
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+# Events
+
+SkyWalking already supports the three pillars of observability, namely logs,
metrics, and traces.
+While in a production system in reality, there are many other events that may
affect the performance of the system, such as upgrading, rebooting, chaos
testing, etc.
+Although some of these events can reflect from the logs, there are also many
other events that can not, hence SkyWalking provides a more native way to
collect these events.
+This doc covers the design of how the SkyWalking collect events and what
events look lik in SkyWalking.
+
+## How to Report Events
+
+SkyWalking backend supports three protocols to collect events, gRPC, HTTP, and
Kafka. Any agent or CLI that implements one of these protocols can report
events to the SkyWalking.
+Currently, the officially supported clients to report events are:
+
+- [ ] Java Agent Toolkit: Use the Java agent toolkit to report events from
inside the applications.
+- [ ] SkyWalking CLI: Use the CLI to report events from the command line
interface.
+- [ ] Kubernetes Event Exporter: Deploy an event exporter to refine and report
Kubernetes events.
+
+## Event Definition
+
+An event contains the following fields. The definitions of event can be found
at the [protocol repo](#TODO)
+
+### UUID
+
+Unique ID of the event. Because an event may span a long period of time, the
UUID is necessary to associate the start time with the end time of the same
event.
+
+### Object
+
+The object that the event occurs on. In the concepts of SkyWalking, the object
is typically service, service instance, etc.
+
+### Name
+
+The name of the event. For example, `Start`, `Stop`, `Crash`, `Reboot`,
`Upgrade` etc.
+
+### Type
+
+The type of the event. This field is friendly for UI visualization, where
events of type `Normal` is considered as normal operations,
+while `Error` is considered as unexpected operations, such as `Crash` events,
therefore we can mark them with different colors to be easier identified.
+
+### Message
+
+The detail of the event that describes why this event happened. This should be
a one-line message that briefly describes why the event is reported. Examples
of a `Crash` event may be something like `Run out of memory`.
+It's NOT encouraged to include the detailed logs of this event, such as the
exception stack trace.
Review comment:
I think `from.version=1.2/to.version=1.3` is reasonable in the message.
@kezhenxu94 WDYT? I think the typical thing should not be included is
`exception stack`, which belongs to logs or trace/span.
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